bluuebunny/crossref_metadata_2025 huggingface dataset:
Structural Changes of Nitroaromatic Molecules During the Intramolecular Charge Transfer
Authors: Lee Sebok , Jen Myungsam , Lee Gisang , Pang Yoonsoo
Published: January 2021

Intramolecular charge transfer of nitroaromatic molecules is probed with time-resolved stimulated Raman spectroscopy, where two resonant stretchings (ν8a) show clear evidence for the structural changes including the twist of the biphenyl groups.
Detection and Classification of Defects in Organic Photovoltaic Devices Using Thermoreflectance Imaging
Authors: Molina Alfred , Wang Valerie , Kornegay Katheryn , Li Sabrina , Tanenbaum David , Hudgings Janice
Published: January 2021

Thermoreflectance imaging is a high resolution, non-contact thermal imaging technique, which can be used to identify and characterize different types of defects in organic solar cells.
Squeeze Free Space Using Nonlocal Flat Optics
Authors: Guo Cheng , Wang Haiwen , Fan Shanhui
Published: January 2021

We show that free space can be substituted with nonlocal flat o ptics with a wavevector-dependent transfer function. We provide a concrete photonic crystal slab device, which can substitute free space of 144 times greater thickness.
Duality Symmetry in Hybrid Nanoresonators for Chiral Sensing
Authors: Mohammadi Ershad , Tittl Andreas , Tsakmakidis Kosmas L. , Raziman T.V. , Curto Alberto G.
Published: January 2021

Metal nanoparticles support intense electric resonances, while high-index dielectric particles offer strong magnetic resonances. Here, we propose metal-dielectric nanophotonic platforms based on duality symmetry for chiral molecular sensing.
Photonic Interference Cancellation with Free-Space Optical Link for Cellular Networks
Authors: Qi Yang , Wu Ben
Published: January 2021

We design and demonstrate a free-space photonic interference cancellation system applied for cellular networks. It achieves proper performance of selected cellular networks for receivers and cancels interference from the radio frequency bandwidth.
Material identification with a filter array-detector array infrared microspectrometer: numerical study
Authors: Meng Jiajun , Cadusch Jasper J. , Crozier Kenneth B.
Published: January 2021

We design a plasmonic filter array for a filter array-detector array microspectrometer. We perform numerical experiments, including noise, that predict that this configuration would enable the identification of various materials via their infrared fingerprints.
Graphene-based Capacitive Structures Fabrication for Optical Modulation Devices
Authors: Shimabuko Hilton H. , Ramírez Jhonattan C. , Saito Lúcia A. M.
Published: January 2021

This work presents the fabrication processes, for an embedded two CVD-grown single-layer graphene based capacitive structure, with Al2O3 as a thin dielectric layer between them, aiming to act as an active medium for electro-optical modulators.
Efficient Simulation of Loop Quantum Gravity — A Scalable Linear-Optical Approach
Authors: Cohen L. , Brady A. J. , Huang Z. , Liu H. , Qu D. , Dowling J. P. , Han M.
Published: January 2021

We unite loop quantum gravity (LQG) with linear-optical quantum simulation, by designing linear-optical quantum circuits which mimic scattering amplitudes of LQG. Our design efficiently computes LQG amplitudes, which are classically intractable.
Ince-Gauss Modes of Aberrated Cavities as Emulators of Many-Body Topological Transitions
Authors: Gutiérrez-Cuevas R. , O’Dell D. H. J. , Dennis M. R. , Alonso M. A.
Published: January 2021

The modes of an aberrated cavity are shown to be analogous to a Bose-Hubbard dimer with the net orbital angular momentum and the Ince-Gauss modes taking the roles of particle number and eigenstates, respectively.
Unitary linear optical transformations in a reconfigurable platform
Authors: Martínez Aldo C. , Luo Siwei , Pagé Jordan , Liu Li , Giner Lambert , Abrahao Raphael A. , Lundeen Jeff S.
Published: January 2021

Applications across photonics require transformations of optical spatial modes. Utilizing a discrete set of phase masks and free space propagation, we experimentally demonstrate general transformations on a beam array.
Cascaded Stokes and anti-Stokes microlaser based on a surface-functionalized optical resonator with a self-assembled organic monolayer
Authors: Kovach Andre , Gallegos Arynn , He Jinghan , Choi Hyungwoo , Armani Andrea M.
Published: January 2021

In this work, a microresonator is modified with an organic monolayer, allowing four orders of CSRS to be observed with sub-mW input power. The SARS efficiency is also improved by three orders of magnitude.
Laser-Induced Focusing for Silicon nanoscopy
Authors: Shabairou Nadav , Tiferet Maor , Zalevsky Zeev , Sinvani Moshe
Published: January 2021

We demonstrate the shaping and focusing of a probe IR (λ=1.55μm) laser beam in silicon. The shaping was done by a second pump laser beam at λ=0.775μm and 30ps pulse width which simultaneously and collinearly, illuminates the silicon surface with the IR beam. The shaped probe beam will be used in silicon nanoscopy.
Broadband directional control of thermal emission
Authors: Xu Jin , Raman Aaswath P.
Published: January 2021

We experimentally realize a broadband directional thermal emitter by introducing a subwavelength photonic film consisting of multiple oxides that exhibit epsilon-near-zero (ENZ) regions at long-wave infrared wavelengths.
Quantum sensing of magnetic fields using quantum hamiltonian learning
Authors: Santagati Raffaele , Gentile Antonio A. , Knauer Sebastian , Schmitt Simon , Paesani Stefano , Granade Chris , Wiebe Nathan , Osterkamp Christian , McGuinness Liam P. , Wang Jianwei , Thompson Mark G. , Rarity John G. , Jelezko Fedor , Laing Anthony
Published: January 2021

We present our recent results in applying machine learning to the estimation of magnetic fields with NV centers quantum sensors. We report room temperature sensitivities comparable to those so far achieved with cryogenic set-ups.
Photonic resonators with microring-like behavior based on standing wave cavity pairs with opposite-symmetry modes
Authors: Al Qubaisi Kenaish , Popović Miloš A.
Published: January 2021

We emulate the reflectionless response of a traveling-wave resonator using two bus-coupled photonic crystal nanobeam cavities with respective symmetric and antisymmetric modes. The scheme may enable new active device platforms beyond ring resonators.
Foundry integrated nanophotonic devices and metasystems
Authors: Gu Tingyi , Xiao Yahui , Wang Zi , Mao Dun , Wang Feifan , Li Tiantian , Lee Hwaseob
Published: January 2021

We will present our recent progress of foundry processed low loss photonic crystals, metasurface and metasystem, towards the femtojoule optical switch, tapers with ten folds length reduction and on-chip analog mathematical operation.
Sub-diffraction-limit Optofluidic Imaging
Authors: Mandracchia Biagio , Son Jeonghwan , Jia Shu
Published: January 2021

A great interest in the integration between microfluidics and fluorescence microscopy has led to the flourishing of new flow-based imaging methods for both bench-top and portable solutions. Nonetheless, such systems still operate in a diffraction-limited regime due to the fact that super-resolution techniques are usually incompatible with a continuous sample flow. Here, we propose an optofluidic-based system that allows resolution doubling in moving samples, paving the way for the addition of sub-diffraction-limited imaging to the available tools for optofluidic devices.
Frequency-comb-tailored soliton rains
Authors: Zhao Junqing , Zhou Jian , Chen Zikai
Published: January 2021

We, for the first time, realize a type of soliton rain in a frequency-comb-tailored format that is partially depleted from a noise-like-pulse package in a fiber laser. This is enabled by incorporating a home-made micro-knot-resonator.
Photon-Level Dual-Comb Spectroscopy with Resolved Comb Lines
Authors: Chen Zaijun , Hänsch Theodor W. , Picqué Nathalie
Published: January 2021

Using photon-counting technology, dual-comb spectroscopy with resolved comb lines is performed at a power level of a few picowatts. The low power, >107 times weaker than most previous implementations, opens up applications to precision spectroscopy.
Harnessing spectral phase in broadband time-energy entangled photons for precision delay sensing
Authors: Seshadri Suparna , Imany Poolad , Lingaraju Navin , Leaird Daniel E. , Weiner Andrew M.
Published: January 2021

A scheme to measure temporal delay between two optical paths using a high-dimensional biphoton frequency comb is proposed. Interference of frequency bins via electro-optic phase modulation provides picosecond-scale sensitivity to delay detuning.
Optical Gyroscope with Coherent-Boosted Two-Mode Squeezed Beams
Authors: Xiao Xiao-Qi , Matekole Elisha S. , Zhao Jiankang , Zeng Guihua , Dowling Jonathan P. , Lee Hwang
Published: January 2021

We propose a new gyroscope scheme with a two-mode squeezed coherent light as the source. With the intensity-difference measurement, the phase sensitivity is better than the shot-noise limit, and can saturate the Crámer-Rao Bound. The loss inside the gyroscope can be compensated by adjusting the squeezing parameters.
Enhancing the resolution of Fourier light-field microscopy using a hybrid wide-field microscopy image
Authors: Liu Wenhao , Jia Shu
Published: January 2021

We propose a method for Fourier light-field microscopy reconstruction using a hybrid wide-field microscopy image to improve the system resolution by more than two times and demonstrate its capability with both simulated and experimental data.
Single molecule Coordinate and Height super-resolution Imaging with Dithering and Orientation (CHIDO)
Authors: Alemán-Castañeda Luis A. , Curcio Valentina , Brown Thomas G. , Brasselet Sophie , Alonso Miguel A.
Published: January 2021

We present a new technique for fluorescence microscopy that allows 3-D localization plus orientation and wobbling characterization. Using a spatially varying birefringent mask the information is encoded in the PSFs of the circularly polarized components.
Practical aspects of super-resolution optical fluctuation image scanning microscopy (SOFISM)
Authors: Makowski Adrian , Lubin Gur , Tenne Ron , Sroda Aleksandra , Rossman Uri , Oron Dan , Lapkiewicz Radek
Published: January 2021

We reintroduce the concept of SOFISM and discuss its practical aspects. We demonstrate that supplying a confocal microscope with a SPAD array detector enables super-resolution imaging relying on fluorophore blinking within reasonable dwell times.
Interferometric measurements of the resonant nonlinearity of CO and CO2 gas in the 9 – 11 µm range
Authors: Pigeon J. J. , Tochitsky S. Ya. , Louwrens G. J. , Ben-Zvi Ilan , Joshi C.
Published: January 2021

We report interferometric measurements of the resonant nonlinearity of CO and CO2 gas using a continuously tunable, multiatmosphere CO2 laser. The implications of these measurements to atmospheric nonlinear optics will be discussed.
Quantum Firmware: Ingredients and Applications
Authors: Hempel Cornelius
Published: January 2021

Quantum firmware captures the layer between physical gate operations and their logical equivalent at a higher level. Our experiments on trapped-ion qubits demonstrate its use to suppress errors, error correlations and increase gate robustness.
Generation of soliton pulse with Non-linear Polarization Rotation (NPR) Passive Mode Locked fiber Laser
Authors: Avazpour Mahrokh , Hesami Majid , Hernández-García J.C. , Sierra-Hernández J.M. , Estudillo-Ayala J.M. , Laguna R. Rojas
Published: January 2021

Soliton pulses with picosecond time duration whose amplitude and temporal distribution is random and their repetition frequency correspond to the fundamental frequency have been generated from NPR mode-locking fiber laser.
Dynamics and Excitation of Absorbing and Amplifying Random Media
Authors: Huang Yiming , Kang Yuhao , Genack Azriel Z.
Published: January 2021

Using microwave measurements, numerical simulations and analytic theory, we find expressions for the spectra of the transmission time, energy density and density of states in nonunitary random media.
Down-Conversion Emission Profile characterisation via Camera
Authors: Kuniyil Hashir , Durak Kadir
Published: January 2021

We present a method to improve the brightness and collection efficiency of the spontaneous parametric down-conversion source by monitoring the mode shape using camera and correcting it with collection optics.
New Developments on Primary Processes in ITO/TPD/Alq3/Al OLEDs at Low bias Voltage
Authors: Ratsimbazafy Fanomezantsoa Louis M. , Gauvin Serge
Published: January 2021

Current-voltage measurements at low voltage (~ 1 V) strongly suggest that ions can move in OLEDs during the first current-voltage (I-V) scan. This might be important to the design of emerging organic lasers.
Single qubit preparation and quantum gates from third order nonlinear optics
Authors: Domínguez-Serna Francisco , Garay-Palmett Karina
Published: January 2021

We present a study on the preparation and manipulation of path-like temporal-mode qubits based on third-order nonlinear materials. Our study allows for experimentally feasible proposals, capable of controllable arbitrary qubit transformations.
Invariance Principle for Wave Propagation inside Inhomogeneous Materials
Authors: Genack Azriel Z. , Huang Yiming , Tian Chushun , Gopar Victor A. , Fang Ping
Published: January 2021

We demonstrate in microwave experiments and theory that wave statistics within samples of any dimension depend only on the net strengths of distributed scattering and reflection between the observation point and each of the boundaries.
The Effect of Coupling Disorder on the Transfer Efficiency in the LH1-RC Photosynthetic Unit
Authors: Wyke Ethan , Aiyejina Abuenameh , Andrews Roger
Published: January 2021

A quantum model of the LH1-RC is presented with disorder in the photon-donor and donor ring inter-site couplings. The effect of disorder on the transfer efficiency of the excitation is investigated.
Frequency Stability Enhancement of Self-Injection Locked Laser
Authors: Galiev R. R. , Kondratiev N. M. , Lobanov V. E. , Matsko A. B. , Bilenko I. A.
Published: January 2021

We developed a model that enables both a deeper understanding of the salient physical features of the self-injection locking of a laser to high-quality factor WGM microresonator and corresponding improvements of the laser frequency stabilization.
Small-Sized Interferometer with Fabry-Perot Resonators for Gravitational Wave Detection
Authors: Petrov Nikolai I. , Pustovoit Vladislav I.
Published: January 2021

Compact laser interferometer with Fabry-Perot resonators consisting of two spatially distributed "mirrors" for detecting gravitational waves is proposed. Extremely high sensitivity of such an interferometer for small movements of mirrors is demonstrated.
Probing Higher-Order Nonlinearities with Ultrashort Solitons
Authors: Linale N. , Grosz D. F. , Fierens P. I.
Published: January 2021

We analyze the impact of higher-order nonlinearity on ultrashort solitons by means of a photon-conserving propagation equation, and propose an original and direct method for its estimation.
Detection of Small Displacements Using of Optical Diffractive Correlator
Authors: Gnatovskiy O. , Bugaychuk S. , Gnatovskyy V. , Sidorenko A. , Negriyko A.
Published: January 2021

We are developing a method for determining precise displacements based on mutual transverse shift between two diffraction gratings included in optical correlator. Intensity distribution over diffraction orders unambiguously expresses magnitude of the smallest grating displacement.
Operating Principle of Data Distributing Technique of Secure Data Transmission in Multimode Fiber Systems
Authors: Svistunov D.V.
Published: January 2021

Principle of new technique based on mode division multiplexing is described. Data distributing technique enables counteracting the eavesdropping from few- and multimode trunk fibers by impeding a decoding of illegally read data.
Exciton Diffusion and Annihilation in Nanophotonic Purcell Landscapes
Authors: Raziman T. V. , Visser C. Peter , Wang Shaojun , Rivas Jaime Gómez , Curto Alberto G.
Published: January 2021

Conventional nanophotonic emission enhancement neglects excitonic phenomena of diffusion and annihilation. We go beyond the localized Purcell effect and identify the enhancement mechanisms to turn their detrimental impact into additional emission.
Resonant Enhancement of Emission of Dipoles Located in Epsilon-Near-Zero Metal Nanorod-Based Metamaterial
Authors: Novikov V. B. , Murzina T. V.
Published: January 2021

Resonant enhancement of light power emitted by dipoles located inside silver nanorod-based hyperbolic metamaterial near its interface is revealed at epsilon-near-zero regime of metamaterial. Enhancement is accompanied by peculiar radiation pattern.
Impact of phased array on optical performance of AWG-spectrometers
Authors: Seyringer Dana , Serecunova Stanislava , Seyringer Heinz , Uherek Frantisek
Published: January 2021

We studied an impact of phased array on optical performance and size of SiN based AWG-spectrometers, which plays a significant role in integration on chip. AWG-spectrometer was designed for TM-polarization and 850 nm central wavelength.
Resonator oscillator of THz radiation realized by current pumping in a CNT array
Authors: Zolotovsky I.O. , Kadochkin A.S. , Panyaev I.S. , Ribenek V.A. , Sannikov D.G.
Published: January 2021

A scheme of a oscillator system based on a cavity filled with a CNT array is proposed. The generation mechanism is associated with a strong resonant interaction arising from the noise of an electromagnetic wave in the THz range with an unsteady current. A theoretical model is proposed that describes the amplification and generation of THz radiation in the structure. The results of the work can be used to create new THz CW generators.
Craig’s Effect as a Model of the Human Eye
Authors: Gitin A. V.
Published: January 2021

An analogy between the observer’s eye and an autofocusing device based on the Craig’s effect is noted. From the physiological laws of visual perception, the well-known integral qualities for both the optical system and the formed image can be derived by this analogy
Near Infrared Optics Simulations in Free Space and Application for 5G’s Interconnection
Authors: Dath Cheikh A. B.
Published: January 2021

A class 1 laser simulated as wireless optical transmission system (FSO) at lowest visibilities in Dakar, provides 2 km range and good power margin, thus arguing fronthaul and backhaul proposals for 5G accessibility and reliability.
A Highly-Efficient and Compact Surface Plasmon Polaritons High-Pass Filter based on MIM waveguides
Authors: Ebadi Seyed Morteza , Örtegren Jonas
Published: January 2021

This letter presents design and simulation results of a highly-efficient and compact plasmonic high-pass filter based on a MIM waveguide. Numerical results reveal that by tailoring structural parameters, desired cut-off wavelength can be chosen.
Theoretical analysis of the influence of loss position and pump power on the efficiency and oscillation spectrum in the oscillator of a mode-locked laser
Authors: Ashizawa H. , Maeda J. , Kawato S.
Published: January 2021

We analyzed numerically the influence of loss position and pump power on the efficiency in the oscillator of a mode-locked laser cavity. We reported the increasing pump power is effective in improving efficiency.
Non-Zero Dispersion-Shifted Ring Fiber for OAM Mode
Authors: Zhao Wenqian , Geng Wenpu , Wang Yingning , Fang Yuxi , Bao Changjing , Wang Zhi , Liu Yan-ge , Ren Yongxiong , Pan Zhongqi , Yue Yang
Published: January 2021

We propose and design non-zero dispersion-shifted ring fiber for OAM Mode. A low dispersion of 3.3 ps/(nm·km) at 1550 nm and <2.9 ps/(nm·km) dispersion variation from 1530 to 1565 nm for OAM1,1 mode is achieved.
Dual-Grating Meta-Structure Optimized for Perfect Narrow-Band Absorption in an Ultrathin Absorber for Tunable Sensing Applications
Authors: Avrahamy Roy , Zohar Moshe , Auslender Mark , Milgrom Benny , Hava Shlomo , Shikler Rafi
Published: January 2021

We introduce a 5µm-thick meta-structure design showing ~100% ultra-narrow, angular-sensitive resonant absorptance, MWIR peaked with Q ≈ 2650 for tunable sensing applications. Light trapping inside a 22nm absorber is visualized by Poynting vector vortex topology.
Observation of resonance cloaking with vanishing capacitance in terahertz multilayer metasurfaces
Authors: Siddiqui Zaheer Hassan , Karmakar Subhajit , Varshney Ravendra K.
Published: January 2021

We propose a novel capacitance cancellation technique (CCT) in concentrically coupled THz multilayer metasurfaces. Anti-parallel surface current at resonating frequency and strong near-field coupling result cloaked response of constituent resonators.
Femtosecond Laser Inscribed Eccentric Small-Period Long-Period Fiber Grating for Curvature and Refractive Index Sensing
Authors: Yang Meijuan , Zhao Rong , Shu Xuewen
Published: January 2021

An eccentric small-period long-period fiber grating sensor with a period of 36μm fabricated by femtosecond laser is reported. The sensor exhibits high sensitivity for curvature and external refractive index and low temperature cross sensitivity.
The tailored complex refractive index of hydrogenated amorphous silicon for dielectric metasurfaces
Authors: Yang Younghwan , Yoon Gwanho , Park Sunghak , Namgung Seok Daniel , Nam Ki Tae , Rho Junsuk
Published: January 2021

We found the correlation between atomic bonding structures and the refractive index in the visible spectrum. We found that optical hydrogenated amorphous silicon exhibits the extinction coefficient of 0.082 at the wavelength of 450 nm.
Effect of Pre-amorphization and Annealing on the Performance of a Silicon Optical Phase Shifter
Authors: Mishra Darpan , Minz Manoranjan , Sonkar Ramesh Kumar
Published: January 2021

The effect of pre-amorphization and annealing on the silicon optical PN phase shifter performance is studied. It is observed that the absorption has a larger dependency on the process parameters compared to the phase shift.
Two-Dimensional Beam Steering in Silicon-On-Insulator Platform Using Wavelength Tuning
Authors: Fang Yuxi , Wang Qiang , Han Xu , Wang Zhonghan , He Yuxuan , Geng Wenpu , Pan Zhongqi , Yue Yang
Published: January 2021

An integrated passive silicon photonics platform for two-dimensional (2D) beam steering using laser wavelength tuning only is systematically investigated. Furthermore, 3× sweeping resolution improvement in azimuthal angle direction is achieved over previous work.
A numerical solution of phototacoustic wave equation for red blood cell by the Born series methods
Authors: Kaushik Anuj , Saha Ratan K.
Published: January 2021

The time-independent inhomogeneous photoacoustic wave equation is solved by the Born-series (BS) methods for erythrocyte. The convergent BS method provides accurate results even for strong speed-of-sound mismatch between the source and ambient medium
Microscopic and Spectroscopic Characterization of Elastomer for Microfluidics Application
Authors: Banik Soumyabrata , N Pooja , Chakraborty Ishita , Mal Sib Sankar , Mahato K. K. , Srisungsitthisunti Pornsak , Mazumder Nirmal
Published: January 2021

We have developed elastomers using potato and corn starch with various concentration and characterised them using microscopic and spectroscopic techniques.
Holographic Display for Uniform Energy High Order Terms
Authors: Lee Dukho , Bang Kiseung , Lee Byoungho
Published: January 2021

We present a method to generate uniform energy signal wave without energy loss for holographic display. The proposed method was confirmed by experiments. Experimental results show that the reconstructed signal wave has flat energy envelope.
Quantum Mechanical Techniques in Light-Beam Optics
Authors: Khan Sameen Ahmed
Published: January 2021

It is possible to apply quantum methodologies to the matrix-representation of Maxwell’s equations. This results in a unified formalism of light beam optics and light polarization, accompanied with wavelength-dependent contributions.
Generalized nonlocality criteria under the correlation symmetry
Authors: Bae Kwangil , Son Wonmin
Published: January 2021

The class of correlation for the most generalized Bell scenario considering N-partite d-chotomic system with k number of measurements is derived under the constraint of measurement symmetries. The nonlocality criteria for the generalized scenario is obtained using the correlation function, which is derived from Fourier analysis of probability spectrum. The condition under which the local hidden variable model is violated by the multipartite quantum state is found in analytic manner. It is shown that the various types of known Bell inequalities can be derived in our class of correlation.
Deep Learning Based Compressive Imaging Method for High Precision Adaptive Null Interferometric Testing of Aspheric and Freeform Mirrors
Authors: Sharma Shruti , Vasishtha D.
Published: January 2021

High precision adaptive null interferometric testing of aspheric and freeform mirrors using SLM is limited by pixel pitch. Deep learning based compressive imaging has been proposed. Wavefront accuracy similar to non adaptive CGH is obtained.
Single Output AlGaAs MQW Optical Multiplexer for Board to Board Communications
Authors: Zakariya Abdullah J.
Published: January 2021

A board to board monolithic LED multiplexer is designed based on selectively intermixed quantum wells. The LED device emits four independently controlled wavelengths into an SU8 flexible optical waveguide to achieve multi-optical coupling methods.
Strong optical nonlinearities in dispersive dielectric chirped mirrors below the damage threshold
Authors: Gui Guan , Adak Amitava , Dandapat Manika , Carlson Daniel , Morrill Drew , Kapteyn Henry , Murnane Margaret , Liao Chen-Ting
Published: January 2021

We experimentally characterized an unexpectedly-strong nonlinear response in dispersive dielectric multilayer mirrors below the known damage threshold. We observed a strong reflectivity decrease, local heating, transient spectral modifications, and time-dependent absorption of the incident pulse.
Deep Learning based Oral Cancer Image Classification for Imbalanced Dataset
Authors: Song Bofan , Sunny Sumsum , Li Shaobai , Keerthi G , Patrick Sanjana , Mukhia Nirza , Gurudath Shubha , Raghavan Subhashini , Mendonca Pramila , Tsusennaro  , Leivon Shirley T , Kolur Trupti , Shetty Vivek , R Vidya Bushan , Ramesh Rohan , Pillai Vijay , Sigamani Alben , Suresh Amritha , Kuriakose moni Abraham , Birur Praveen , Liang Rongguang
Published: January 2021

We use both data- and algorithm-level methods to improve the neural network performance of oral cancer image classification with imbalanced multi-class dataset captured from high-risk populations during oral cancer screening.
Development of a Simulation Platform for Studying the Dynamics of a Semiconductor Laser
Authors: Cheng Quanrun , Nie Bairun , Ji Bo , Ruan Yuxi , Yu Yanguang
Published: January 2021

We propose an optical simulation platform to realize the rich nonlinear dynamics of semiconductor lasers with external feedback by solving the well-known Lang and Kobayashi rate equations through the fourth-order Runge-Kutta method.
Classification and forecasting of real-time server traffic flows employing long short-term memory for hybrid E/O data center networks
Authors: Balanici Mihail , Pachnicke Stephan
Published: January 2021

Long short-term memory neural networks demonstrate a classification accuracy larger than 99% for highly variable and bursty, real-time server traffic flows. Their performance in terms of forecasting precision displays promising results, both for one-step as well as multi-step predictions. These capabilities make the a priori detection of heavy data streams possible, thus enabling the employment of optical circuit switching.
Acoustic resonances in concentric and eccentric cylindrical semiconductor nanowires within a two-fluid hydrodynamic model
Authors: Shi Yi , Ma Xikui , Dong Tianyu
Published: January 2021

A two-fluid hydrodynamic model is employed to model the spatial dispersion when both electrons and holes in semiconductors are considered. Within the two-fluid hydrodynamic model, analytical solutions to the nonlocal responses of cylindrical multilayered concentric and eccentric nanowires are obtained using the Mie theory and the scattering matrix method, which are also validated by finite element simulations. It is demonstrated that the greater the geometric asymmetry is, the stronger the acoustic resonance peaks in the extinction cross section spectra will be. In addition, charge distributions of nanowires are investigated, which reveal versatile resonance modes. We believe the proposed analytical approach provides a fast and accurate tool to rapidly analyze and optimize the optical responses of cylindrical multilayered plasmonic devices.
Nanophotonic waveguide based on engineered horizontal-vertical slots
for polarization independent bio-chemical sensing
Authors: Sulabh  , Kaushik Vishal , Singh Lalit , Rajput Swati , Kumar Mukesh
Published: January 2021

A nanophotonic waveguide based on engineered horizontal and vertical slots is proposed. The proposed engineered structure is composed of three silicon ribs forming two vertical slots, and on top a gold cover in the shape of microchannel forms horizontal slot regions. We are able to increase the bulk sensitivity in TM mode by 1.5 times with the gold cover. The bulk sensitivity for TE and TM mode is reported to be

1.024

n
m

−
1

and

0.95

n
m

−
1

, respectively. Surface sensitivity, investigated numerically, is

0.265

×

10

−
2

R
I
U

/

n
m

for DNA hybridization and

2.3

×

2

π

/

r
a
d

for hepatitis surface antigen detection.
Quantum Control of Cold Molecular Collisions Using Stark-Induced Adiabatic Raman Passage
Authors: Perreault William E.
Published: January 2021

Experimental understanding of molecular forces requires controlled scattering experiments. We developed Stark-induced adiabatic Raman passage to prepare molecular quantum states, and applied it to the scattering of HD molecules, leading to insights into molecular-scale forces.
Detection of Optical Vortices with Various Topological Charges using Single-pixel Dual-comb Imaging
Authors: Asahara Akifumi , Adachi Takuto , Akiyama Seishiro , Minoshima Kaoru
Published: January 2021

Optical vortices with various types of topological charges are characterized using single-pixel dual-comb imaging spectroscopy. The effectiveness of the dual-comb system is demonstrated as a versatile tool for full-characterization of optical vortex.
Transparency Effects Due To Single-photon Transport In Waveguide QED
Authors: Mukhopadhyay Debsuvra , Agarwal Girish S.
Published: January 2021

We analyze single-photon transport through a one-dimensional (1D) waveguide strongly coupled to a periodic array of two-level atoms. We demonstrate the possibility of achieving transparency without applying any coupling field.
Composite Yb:YAG/Sapphire active elements for thin-disk lasers
Authors: Kuznetsov Ivan , Volkov Mikhail , Pestov Alexey , Mukhin Ivan , Chkhalo Nikolay , Palashov Oleg
Published: January 2021

Comparative study of thermal effects and lasing in the composite Yb:YAG/sapphire active elements produced by different techniques is performed. Depolarization is a significant problem, but a proper choice of parameters allows minimizing this impact.
Digital plasmonic holography with iterative phase retrieval for sensing
Authors: Spies Ryan M. , Cole Grace H. , Engevik Marit A. , Nordberg Britta G. , Scharnick Evan A. , Vliem Isaac M. , Brolo Alexandre G. , Lindquist Nathan C.
Published: January 2021

Propagating surface plasmon waves have been used for many applications including imaging and sensing. However, direct in-plane imaging of micro-objects with surface plasmon waves suffers from the lack of simple, two-dimensional lenses, mirrors, and other optical elements. In this paper, we apply lensless digital holographic techniques and leakage radiation microscopy to achieve in-plane surface imaging with propagating surface plasmon waves. As plasmons propagate in two-dimensions and scatter from various objects, a hologram is formed over the surface. Iterative phase retrieval techniques applied to this hologram remove twin image interference for high-resolution in-plane imaging and enable further applications in real-time plasmonic phase sensing.
On-chip photon-pair generation in a silica microtoroidal cavity
Authors: Hashimoto Yosuke , Goban Akihisa , Hirabayashi Yuki , Kobayashi Yuta , Araki Tomohiro , Aoki Takao
Published: January 2021

Microcavities with high Q factor and small mode volume have the potential to be efficient and compact sources of photon pairs. Here, we demonstrate on-chip photon-pair generation by spontaneous four-wave mixing in a silica microtoroidal cavity and obtain a coincidence-to-accidental ratio of 7.4 ± 0.1 with a pump power of 46 µW. The heralded photons also exhibit antibunching characterized by autocorrelation function values of

g
c

(
2
)

(
0
)
=
0.57
±
0.03
<
1

. Comparing with a scaling model, the main noise source is found to be spontaneous Raman scattering in the cavity. This work opens a new possible means for realizing integrated nonclassical photon sources based on silica photonic circuits toward scalable quantum technologies.
Low Vπ thin-film lithium niobate modulator fabricated with photolithography
Authors: Liu Ye , Li Heng , Liu Jia , Tan Su , Lu Qiaoyin , Guo Weihua
Published: January 2021

Thin-film lithium niobate (TFLN) modulators are expected to be an ideal solution to achieve a super-wide modulation bandwidth needed by the next-generation optical communication system. To improve the performance, especially to reduce the driving voltage, we have carried out a detailed design of the TFLN push-pull modulator by calculating 2D maps of the optical losses and Vπ for different ridge waveguide depths and electrode gaps. Afterwards the modulator with travelling wave electrodes was fabricated through i-line photolithography and then characterized. The measured Vπ for a modulator with 5-mm modulation arm length is 3.5 V, corresponding to voltage-length product of 1.75 V·cm, which is the lowest among similar modulators as far as we know. And the measured electro-optic response has a 3-dB bandwidth beyond 40 GHz, which is the limitation of our measurement capability. The detailed design, fabrication and measurement results are presented.
Pre-chirp managed divided-pulse amplification using composite birefringent plates for pulse division and recombination: en route toward GW peak power
Authors: Chen Runzhi , Chang Guoqing
Published: January 2021

Pre-chirp managed amplification (PCMA) allows the generation of optical pulses with a duration well below 100 fs. However, the pulse peak power is limited to <50 MW due to poor energy scalability. In this paper, we combine PCMA and divided pulse amplification to overcome this bottleneck. The resulting pre-chirp managed divided-pulse amplification (PCM-DPA) employs birefringent plates as the pulse divider/recombiner thanks to the picosecond pulse duration in the amplifier. Our numerical analysis shows that the group-delay dispersion (GDD) difference among pulse replicas results in reduced combining efficiency with increased replica numbers. We propose using composite birefringent plates to construct the divider/recombiner that features negligible GDD-difference. An Yb-fiber PCM-DPA system incorporating such composite-plate based divider/recombiner for 64 replicas can produce 121-µJ, 44-fs pulses with 2.3-GW peak power. To have a compact system, we further propose a hybrid design which can deliver 61-µJ, 48-fs pulses with 1.13-GW peak power. These results represent >30 times improvement in both pulse energy and peak power compared with current Yb-fiber PCMA systems.
Wideband fiber-optic Fabry-Perot acoustic sensing scheme using high-speed absolute cavity length demodulation
Authors: Yang Yang , Wang Ya , Chen Ke
Published: January 2021

In this paper, we realize a wideband fiber-optic Fabry-Perot (F-P) acoustic sensing (FPAS) scheme by utilizing a high-speed absolute cavity length demodulation with a 70-kHz maximum line rate spectrometer. The wideband FPAS is made of a pre-stress stainless-steel diaphragm based on F-P interferometric structure. The real-time absolute F-P cavity lengths are calculated by a phase demodulation method, which is realized by processing the interference image at a 70-kHz frame rate. Acoustic signal is obtained by extracting the AC component of the demodulated cavity length. The experimental results show that the spectrometer can be running at a 50-kHz line rate, and an acoustic detection wideband of 20 Hz to 20 kHz is obtained. The noise-limited minimum detectable sound pressure level is 18.8 dB, which is sensitive enough for the communication of human voice. The proposed wideband acoustic sensing scheme achieves good robustness, which is promising as a speech-sound microphone for communication during the magnetic resonance imaging procedure.
2D-to-1D constellation reforming using phase-sensitive amplifier-based constellation squeezing and shifting
Authors: Cui Jiabin , Ji Yuefeng , Lu Guo-Wei , Wang Hongxiang , Zhang Min
Published: January 2021

In this paper, a phase-sensitive amplifier (PSA)-based two dimensional (2D)-to-one dimensional (1D) constellation reforming system is proposed and analyzed in detail. The proposed system theoretically realizes seven kinds of 10 GBaud quadrature amplitude modulation (QAM)-to-pulse amplitude modulation (PAM) conversions, including quadrature phase shift keying-to-PAM4 and 8QAM-to-PAM8 conversions. The constellation reforming system consists of a constellation squeezing PSA and a multi-level vector moving PSA. The operating principle and formula derivations of constellation squeezing and vector moving processes are fully explained, including the PSA transfer characteristics and PSA gain axis angle analytical solutions. When implementing QAM-to-PAM conversions, the constellations, spectra, eye diagrams, error vector magnitudes and bit error ratio (BER) performances of the QAM and PAM signals are measured. For 8QAM-to-PAM8 conversion, with the input OSNR of 25 dB and 30 dB, at the BER of 10−3, the converted PAM8 shows the receiver OSNR of 38.9 dB and 35.2 dB, respectively. The proposed and verified 2D-to-1D constellation reforming system builds an optical bridge connecting long-haul and short-reach networks, which can be employed in the format conversion, high-order format signal generation and shaping, and flexible information aggregation/de-aggregation.
Color tuning in a compact core-shell nanocrystal based on intense and high-purity green and red photon upconversion
Authors: Zhou Ziwen , Liu Yu , Sun Xianhao , Xu Li , Khan Fahim , Li Yanzeng , Li Li , Li Hanyang , Ren Jing , Zhang Jianzhong , Liu Lu
Published: January 2021

To date, color-tunable photon upconversion (UC) in a single nanocrystal (NC) still suffers from cumbersome structures. Herein, we prepared a compact two-layer NC with bright and high-purity red and green UC emission upon 980 and 1530 nm excitation, respectively. The effects of trace

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m

3
+

doping and inert-shell coating on the UC color and intensity were discussed. In addition, the color tuning via various dual-excitation configurations and the color stability with temperature and excitation intensity were demonstrated. The proposed UC NC, featuring compact structure and high-quality color tuning, can lower the synthesis time cost and difficulty of its kind and can find wide applications in multi-channel imaging, display devices, anti-counterfeiting, and so on.
Monolithically integrated voltage-controlled MOSFET-LED device based on a GaN-on-silicon LED epitaxial wafer
Authors: Yan Jiabin , Jia Bolun , Wang Yongjin
Published: January 2021

We report a novel monolithically integrated voltage-controlled metal-oxide-semiconductor field effect transistor (MOSFET)-LED device based on a GaN-on-silicon LED epitaxial wafer. An N-channel enhancement mode MOSFET and an InGaN/GaN multiple-quantum-well (MQW) thin-film LED featured with a suspended membrane are in series connection to constitute the monolithically integrated device without external metal interconnection. A recessed gate structure and AlGaN channel are innovatively adopted to realize an enhancement mode transistor. The fabrication of the MOSFET-LED includes no additional ion implantation or epitaxial growth compared with that of a common MQW LED, which greatly simplifies the device structure and production processes. The measured turn-on voltage of the LED is approximately 4 V, and the threshold voltage of the MOSFET is extrapolated as 5.2 V. The results demonstrate relatively good dimming and switching capacities of the integrated MOSFET-LED. This integration scheme also has potential to achieve a large-scale optoelectronic integrated circuit.
Template free eye motion correction for scanning systems
Authors: Luo Ting , Warner Raymond L. , Sapoznik Kaitlyn A. , Walker Brittany R. , Burns Stephen A.
Published: January 2021

Scanning imaging systems are susceptible to image warping in the
presence of target motion occurring within the time required to
acquire an individual image frame. In this Letter, we introduce the
use of a dual raster scanning approach to correct for motion
distortion without the need for prior knowledge of the undistorted
image. In the dual scanning approach, the target is imaged
simultaneously with two imaging beams from the same imaging system.
The two imaging beams share a common pupil but have a spatial shift
between the beams on the imaging plane. The spatial shift can be used
to measure high speed events, because it measures an identical region
at two different times within the time required for acquisition of a
single frame. In addition, it provides accurate spatial information,
since two different regions on the target are imaged simultaneously,
providing an undistorted estimate of the spatial relation between
regions. These spatial and temporal relations accurately measure
target motion. Data from adaptive optics scanning laser ophthalmoscope
(AOSLO) imaging of the human retina are used to demonstrate this
technique. We apply the technique to correct the shearing of retinal
images produced by eye motion. Three control subjects were measured
while imaging different retinal layers and retinal locations to
qualify the effectiveness of the algorithm. Since the time shift
between channels is readily adjustable, this method can be tuned to
match different imaging situations. The major requirement is the need
to separate the two images; in our case, we used different near
infrared spectral regions and dichroic filters.
Asymmetric spectral broadening of sub-picosecond laser pulse in BaWO4 crystal: interplay of self-phase modulation, stimulated Raman scattering, and orientational Kerr nonlinearity
Authors: Kinyaevskiy Igor , Kovalev Valery , Danilov Pavel , Smirnov Nikita , Kudryashov Sergey , Koribut Andrey , Ionin Andrey
Published: January 2021

Spectral broadening of 0.3 ps 515 nm laser pulse in a highly Raman-active

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crystal and fused silica demonstrates significantly different behavior with the incident pulse energy. While the broadening in fused silica is fairly symmetric with respect to the pump laser pulse wavelength, the Stokes wing broadening in the

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crystal is 2 times wider than that of anti-Stokes wing, the former demonstrating a step-like increase with the pulse energy. To the best of our knowledge, the obtained data are the first clear evidences of the following facts: (i) stimulated Raman scattering with sufficiently high efficiency of conversion to Stokes components slows down spectral broadening induced by self-phase modulation, and (ii) the mechanism of Kerr nonlinearity, which is responsible for self-phase modulation in

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, is of orientational nature. The nonlinear refraction coefficient and its decay time following from our experiments with

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were estimated as

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15

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and

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.
Low gas pressure sensor based on a polymer optical fiber grating
Authors: Dash Jitendra Narayan , Cheng Xin , Tam Hwa-yaw
Published: January 2021

A fiber Bragg grating (FBG) inscribed Zeonex-based novel, to the best of our knowledge, side hole polymer optical fiber (SHPOF) is proposed and demonstrated for low gas pressure measurement above and below the atmospheric pressure. Two different grades of Zeonex have been used to fabricate the core and cladding of this fiber, thereby making it dopant free. The side hole introduced in the cladding is parallel to the fiber core. A few ultrashort pulses with nanosecond duration have been used to write the FBG in the core of this fiber. The incorporation of the side hole leads to enhancement of pressure sensitivity as well as low hysteresis and performance repeatability compared to Zeonex-based conventional polymer optical fiber (CPOF). Above the atmospheric pressure, the proposed probe shows a pressure sensitivity of 0.47 pm/kPa, which is 80% more compared to the Zeonex-based CPOF and 0.48 pm/kPa for regime below atmospheric pressure. The sensor has a resolution of 2.12 kPa and exhibited very low hysteresis.
Bayesian hierarchical models for disease mapping applied to contagious pathologies
Authors: Coly Sylvain , Garrido Myriam , Abrial David , Yao Anne-Françoise
Published: January 2021

Disease mapping aims to determine the underlying disease risk from scattered epidemiological data and to represent it on a smoothed colored map. This methodology is based on Bayesian inference and is classically dedicated to non-infectious diseases whose incidence is low and whose cases distribution is spatially (and eventually temporally) structured. Over the last decades, disease mapping has received many major improvements to extend its scope of application: integrating the temporal dimension, dealing with missing data, taking into account various a prioris (environmental and population covariates, assumptions concerning the repartition and the evolution of the risk), dealing with overdispersion, etc. We aim to adapt this approach to model rare infectious diseases proposing specific and generic variants of this methodology. In the context of a contagious disease, the outcome of a primary case can in addition generate secondary occurrences of the pathology in a close spatial and temporal neighborhood; this can result in local overdispersion and in higher spatial and temporal dependencies due to direct and/or indirect transmission. In consequence, we test models including a Negative Binomial distribution (instead of the usual Poisson distribution) to deal with local overdispersion. We also use a specific spatio-temporal link in order to better model the stronger spatial and temporal dependencies due to the transmission of the disease. We have proposed and tested 60 Bayesian hierarchical models on 400 simulated datasets and bovine tuberculosis real data. This analysis shows the relevance of the CAR (Conditional AutoRegressive) processes to deal with the structure of the risk. We can also conclude that the negative binomial models outperform the Poisson models with a Gaussian noise to handle overdispersion. In addition our study provided relevant maps which are congruent with the real risk (simulated data) and with the knowledge concerning bovine tuberculosis (real data).
An examination of perseverative errors and cognitive flexibility in autism
Authors: Landry Oriane , Mitchell Peter
Published: January 2021

Perseveration is a well-replicated finding in autism. The aim of this study was to examine how the context of the task influences performance with respect to this phenomenon. We randomly assigned 137 children aged 6–12 with and without autism to complete a modified card-sorting task under one of two conditions: Children were either told the sorting rules on each trial (Explicit), or were given feedback to formulate the rules themselves (Implicit). While performance was enhanced on the Explicit condition for participants without autism, the participants with autism were disadvantaged by this manipulation. In contrast, there were few differences in performance between groups on the Implicit condition. Exploratory analyses were used to examine this unexpected result; increased autism symptomology was associated with poorer performance.