bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Scattering Property Database of Nonspherical Mineral Dust Aerosol Particles: Introduction and Applications
Authors: Saito Masanori , Yang Ping
Published: November 2021

The single-scattering property database of mineral dust aerosol particles has been developed based on the state-of-the-art light scattering computational techniques and a realistic particle shape model for applications involving spectral radiative transfer simulations.
Radiative Transfer Modelling Challenges to support Quantitative Hyperspectral Imaging
Authors: Govaerts Yves , Leroy Vincent , Nollet Yvan , Schunke Sebastian , Misk Nicolas
Published: November 2021

This paper addresses future developments and associated challenges of radiative transfer models that might be beneficial to support calibration and validation activities of hyperspectral imaging products. Comments and questions should be directed to the OSA Conference Papers staff (tel: +1 202.416.6191, e-mail: cstech@osa.org).
Change Detection Across Satellite Images Collected by Different Sensors
Authors: Ziemann Amanda , Theiler James
Published: November 2021

A joint-distribution based machine learning framework is used to identify anomalous changes in image pairs captured by different sensor designs and even different imaging modalities (e.g., multispectral to synthetic aperture radar).
Spatio-spectral Characterization of Acousto-optical Imagers
Authors: Gorevoy Alexey V. , Machikhin Alexander S. , Martynov Grigoriy N. , Khokhlov Demid D. , Pozhar Vitold E.
Published: November 2021

We address the problem of hyperspectral data correction necessary for acousto-optical imagers. We demonstrate theoretically and experimentally that inevitable spectral inhomogeneity across the field of view may be eliminated by post-processing of the acquired images.
Airborne Fluid Lensing for Precision Reef Mapping – New Results from Guam’s Priority Coral Reefs
Authors: Chirayath Ved
Published: November 2021

Fluid lensing, a passive remote sensing technology, exploits refractive fluid distortions and caustics caused by ocean waves for cm-scale 3D imaging of coral reefs. Results at 45ft depth are presented from a recent Guam campaign.
Application of Spectral-Spatial Classification on Hyperspectral Imagery to Map Coastal Endmembers in Manicouagan Peninsula
Authors: Mukherjee Soham , Pan Yanqun , Ifimov Gabriela , Soffer Raymond , Bélanger Simon
Published: November 2021

The study aims to classify the coastline of Manicouagan Peninsula, QC using WaterSat Imaging Experiment (WISE) hyperspectral imagery. A probabilistic pixel-based spectral classification scheme is integrated with contextual spatial pattern regularization using Bayesian MAP approach.
Developing a PACE Hyperspectral Bio-optical Algorithm Framework for Detection of Freshwater Harmful Algal Blooms
Authors: Sayers Michael
Published: November 2021

A new hyperspectral bio-optical framework is being developed for improved freshwater harmful algal bloom mapping in preparation for the upcoming NASA Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission. Preliminary results for Lake Erie are presented.
ND-space: normalized difference mapping for vineyards
Authors: Philpot William , Gold Kaitlin , Galvan Fernando Romero
Published: November 2021

Identification of materials based on spectral reflectance is complicated by independent variations in reflectance magnitude. A 2-dimensional normalized difference space improves discrimination among bare soils and partial vegetation cover in vineyards.
Real-Time Study of Coexisting States in Laser Cavity Solitons
Authors: Hanzard Pierre Henry , Rowley Maxwell , Cutrona Antonio , Chu Sai T. , Little Brent E. , Morandotti Roberto , Moss David J. , Wetzel Benjamin , Gongora Juan Sebastian Totero , Peccianti Marco , Pasquazi Alessia
Published: November 2021

In this study, we demonstrate that two states can coexist in laser cavity soliton (LCS) microcombs. We present experimental evidence of the simultaneous presence of LCS and a background modulation using Dispersive Fourier Transform.
Terahertz Near-Field Hot Carrier Microscopy
Authors: Tucker Robyn , Peters Luke , Gongora Juan Sebastian Totero , Tunesi Jacob , Rowley Maxwell , Pasquazi Alessia , Peccianti Marco
Published: November 2021

Optical-Pump Terahertz (THz) Near-Field Microscopy (OP-TNFM) is a novel technique for trans- carrier hyperspectral imaging, capable of extracting recombination dynamics and the spatially distributed complex refractive index that results from thermalised carriers in semiconducting materials.
Fabrication tolerant MZI design for broadband WDM filters on scalable SiP platform
Authors: Papadovasilakis Marios , Chandran Sujith , Gebregiorgis Yonas , Bian Yusheng , Rakowski Michal , Krishnamurthy Subramanian , Augur Rod , Viegas Jaime
Published: November 2021

We describe a fabrication tolerant WDM filter with cascaded MZI, using wavelength inde- pendent couplers (WICs). 3D FDTD simulations show broadband device operation with a spectral shift per waveguide width offset of 6.3 pm/nm.
Efficient Polarization Rotator for Thick-film Si3N4 Integrated Photonics Platform
Authors: Stroganov Anton , Aamer Mariam , Brimont Antoine , Jacquemin Ariane , Persoud Fingal , Buriakova Tatiana , Sacchetto Davide , Geiselmann Michael
Published: November 2021

We report a simple implementation of integrated polarization rotator for thick-film SiN platform for S-/C-/L- bands operation. The fabricated devices show high polarization conversion efficiency above 90% and broadband operation.
Synchronously Pumped Waveguide-Based Optical Parametric Oscillator in Silicon Nitride
Authors: Lüpken Niklas M. , Becker David , Würthwein Thomas , Boller Klaus-J. , Fallnich Carsten
Published: November 2021

Optical parametric oscillation based on stimulated four-wave mixing in silicon nitride waveguides was demonstrated. Due to the low-loss silicon nitride technology, the parametric oscillator has the potential to be fully integrated on a single chip.
Nonlinear wave mixing in two-dimensional semiconductors
Authors: Tonelli Francesco , Ciattoni Alessandro , Marini Andrea
Published: November 2021

We describe the second- and third-order nonlinear response of monolayer transition metal dichalcogenides, demonstrating their potential for phase-matched nonlinear wave mixing thanks to their atomic-layer thickness implying a surface-like nonlinear interaction.
High-dimensional Bi-photon Quantum Frequency Combs with Tunable State Entropies
Authors: Haldar Raktim , Rübeling Philip , Kashi Anahita Khodadad , Kues Michael
Published: November 2021

We demonstrate the tunability of the von Neumann entropy of a high-dimensional bi- photon quantum frequency comb using a pulse-driven periodically poled lithium niobate waveguide together with a programmable filter.
Two-Dimensional Materials for the Control of Light at the Atomic Scale
Authors: de Abajo F. Javier García
Published: November 2021

We will discuss recent advances in the study of fundamental aspects and applications of plasmons and other types of polaritons in two-dimensional systems including atomically thin metal films.
Active Compensation of Nonlinear Distortions in Silicon Microring Resonator Filters
Authors: Petrini Matteo , Milanizadeh Maziyar , Morichetti Francesco , Melloni Andrea
Published: November 2021

We propose an approach to real-time compensate nonlinear phenomena in microring resonator silicon photonic filters. Transmission assessments are performed for 200 Gbit/s DP 16- QAM signals, up to 19 dBm.
Enhanced Kerr nonlinear performance in graphene oxide coated silicon and SiN waveguides
Authors: Zhang Y. , Wu J. , Yang Y. , Qu Y. , Jia L. , Liang Y. , Jia B. , Moss D. J.
Published: November 2021

Graphene oxide films are integrated with silicon and SiN waveguides to demonstrate enhanced Kerr nonlinearity. Self-phase modulation with a broadening factor of 4.34 and FWM with ~9.1dB conversion efficiency improvement are achieved.
Generation of time-frequency grid state with integrated biphoton frequency combs
Authors: Fabre N. , Maltese G. , Appas F. , Felicetti S. , Ketterer A. , Keller A. , Coudreau T. , Baboux F. , Amanti M.I. , Ducci S. , Milman P.
Published: November 2021

Encoding quantum information in continuous variables is intrinsically faulty. Nevertheless, redundant qubits can be used for error correction, as proposed in [1]. We show how to experimentally implement this encoding using time-frequency continuous de- grees of freedom of photon pairs produced by spontaneous parametric down conversion. We illustrate our results using an integrated AlGaAs photon-pair source. We show how sin- gle qubit gates can be implemented and finally propose a theoretical scheme for correcting errors in a circuit-like and in a measurement-based architecture.
High Modulation Efficiency Segmented Mach-Zehnder Modulator Monolithically Integrated with Linear Driver in 0.25 µm BiCMOS Technology
Authors: Kress Christian , Singh Karanveer , Schwabe Tobias , Preußler Stefan , Schneider Thomas , Scheytt J. Christoph
Published: November 2021

We present a monolithically integrated electronic-photonic Mach-Zehnder modulator with a linear, segmented driver on the same silicon substrate. As metric for the modulation efficiency, the external V
π
is hereby reduced to only 420 mV.
Chip-Scale Nonlinear Photonics for Green Light Generation Using On-Chip Pump Lasers
Authors: Li Chih-Hao , Ramachandra Sujit H. , Faruque Imad I. , Dwivedi Sarvagya , Arafin Shamsul
Published: November 2021

Nonlinear photonic integrated circuits at green wavelengths with on-chip pump lasers and hybrid waveguides are designed. The calculated nonlinear mode overlap factor and maximum laser-to-waveguide coupling efficiency are 26% and -2.3 dB, respectively.
Mie Resonance Enhancement of Laser Cooling of Rare- earth Doped Nanospheres
Authors: Nemova Galina , Caloz Christophe
Published: November 2021

Laser cooling of solids with anti-Stokes fluorescence is currently attracting widespread attention because of the wide range of its applications, including all-optical cryocooling for airborne and space-based applications, heat suppression in high-power lasers, and cooling of nanoparticles for biological and mesoscopic physics. This laser cooling process has typically very low (only a few%) efficiency and its enhancement is therefore highly desirable. In this work, we propose to leverage Mie resonance to enhance anti-Stokes fluorescence cooling in RE-doped nanoparticles. As an example, we consider an Yb3+:YAG nanosphere pumped at the long wavelength tail of the Yb3+ absorption spectrum, at 1030 nm. We show that if the radius of the nanosphere is adjusted to the pump wavelength in such a manner that the pump excites some of the Mie resonant modes of the sample, the cooling power density generated in the sample is considerably enhanced and the temperature of the sample is consequently appreciably decreased.
Engineered Gr-Coated Al-based Plasmonic Devices for Biosensing Applications in the Optical Communication Band
Authors: Shukla S. , Harkishanka A. R. , Baranwal A. , Arora P.
Published: November 2021

We present engineered graphene-coated aluminum-based plasmonic nanostructures in a prism-coupled configuration, and demonstrate their use for biosensing applications with enhanced sensitivity and figure of merit in the optical communication window.
Novel asymmetric splitting MMI based flatband optical (de)multiplexer for CWDM applications
Authors: Jeong Seok-Hwan
Published: November 2021

We propose novel flatband optical demux operating at 80-nm-wide spectral range with good productivity. Flat spectral response with low spectral crosstalk was theoretically demonstrated by adopting asymmetrically splitting MMI couplers in multistage delayed interferometers.
Investigating the Loss Mechanism in Terahertz Spoof Surface Plasmon Polaritons
Authors: Unutmaz Muhammed Abdullah , Unlu Mehmet
Published: November 2021

We present the methodology to estimate the loss/confinement levels of Terahertz Spoof Surface Plasmon Polariton waveguides, for the first-time, using dispersion curve analysis and, verify with experiments.
Simulation Study of Optical Waveguides with All-dielectric Metamaterial Cladding for Lower Cross-talk in Photonic Integrated Circuits
Authors: Debevc Andraž , Topič Marko , Krč Janez
Published: November 2021

All-dielectric metamaterials can reduce the cross-talk in PICs. We present a numerical study and optimization of metamaterial cladding in silicon technology resulting in decreased minimal gap between waveguides by 53 %.
Effect of tungsten oxide nanoparticles lowering energy barrier in organic photovoltaic using PEDOT:PSS
Authors: Lee Seung Il , Lee Ye Eun , Lee Seok Je , Turak Ayse , Jhun Chul Gyu , Kim Woo Young
Published: November 2021

WO3 nanoparticles were able to manipulate surface work function and applied into ITO anode of OPV device performing higher power conversion efficiency (PCE) and short-circuit current density comparing to conventional OPV device without nanoparticles.
Plasmonic Nano-urchins as Efficient Scatterers: A Comparative Study Using Electromagnetic Simulation
Authors: Gayathri R , Gummaluri V S , Vijayan C , Murukeshan V M
Published: November 2021

Superior scattering properties of plasmonic nano-urchins are studied using FDTD simulations. Along with the many-fold increase in the scattering cross-section, they offer significant enhancement in the field intensity as compared to nanospheres.
Influencing direction instability using loss management in a reciprocal all-fiber kilometer-long ring laser
Authors: Arshad Muhammad Assad , Pratiwi Arni , Hartung Alexander , Jäger Matthias
Published: November 2021

Recently we demonstrated unidirectional lasing in a reciprocal all fiber ring laser. The phenomenon is threshold dependent and both the final direction and threshold can be influenced through loss management of the ring.
Optoelectronic Oscillator (OEO) designs: Wide-range tunable Silicon Microring resonator design and Low-noise High frequency Optical Mix Oscillator design
Authors: Wani Mariya , Azeemuddin Syed
Published: November 2021

This paper amasses and elucidates two designs for the generation of Microwaves using Photonics. The motivation behind this study is the use of low noise circuitry, unlike its analog integrated circuit counterparts.
Lens design with automatic differentiation
Authors: Wang Congli , Chen Ni , Heidrich Wolfgang
Published: November 2021

We propose to power lens design ray-tracing engines with automatic differentiation. Along with the primal, derivatives are algorithmically obtained for lens parameters. Exploiting the gradient information, applications are shown including design optimization and sensitivity analysis.
Computational Imaging for Three-Dimensional Traction Force Microscopy
Authors: Handley Michael , Harvey Andrew R.
Published: November 2021

Measurement of cellular tractions is important for, for example, engineering of artificial tissue. We propose the use of PSF-engineered localisation microscopy to achieve video rate measurements in large volumes with minimal sample light exposure.
Speeding up Four-wave-mixing Imaging Microscopy
Authors: Martin Eric W. , Purz Torben L. , Cundiff Steven T.
Published: November 2021

Laser-scanned imaging based on spectroscopy techniques, such as four-wave- mixing imaging microscopy, are notoriously slow. Here we present techniques to improve the rate of acquiring a laser-scanned image while preserving a high signal-to-noise ratio.
Reflectance Multispectral Imaging for Identification of Algae Contamination in High Voltage Insulators
Authors: Ramanayake R.M.L.S. , Senarath H.M.N.B. , Jayasundara J.M.V.D.B. , Prabhath G.W.K. , Weerasooriya H.M.H.K. , Fernando M.A.R.M. , Kumara S. , Herath H.M.V.R. , Godaliyadda G.M.R.I. , Ekanayake M.P.B. , Athukorala S.
Published: November 2021

An algorithm to identify the algal contamination in high voltage insulators using Bhattacharyya distance, through Ultraviolet-Visible-Near Infrared multispectral images obtained utilizing an in-house developed multispectral imaging system.
Towards a Universal Data Training Set for Coded-Diffraction Image Reconstruction and No-Hidden-Layer Neural Networks
Authors: Muminov Baurzhan , Perry Altai , Hyder Rakib , Asif M. Salman , Vuong Luat T.
Published: November 2021

The stability of an inverse-problem solver depends on algorithm computational complexity. We demonstrate generalizable image reconstruction with the simplest of hybrid machine vision systems: fixed, linear optical preprocessors combined with no-hidden-layer,”small-brain” neural networks.
Blood flow visualization of the image-guided laparoscopic surgical tool (IGLaST) using OCT speckle decorrelation
Authors: Lee Minsuk , Lee Seungrag , Bang Hyeonjin , Lee Eungjang , Park Byungjun , Yoo Hongki
Published: November 2021

We demonstrated a blood flow v isualization m ethod f or t he image-guided laparoscopic surgical tool (IGLaST). Using the inter A-line OCT decorrelations from a moving probe, blood flows in a phantom were successfully isolated from the background.
Developing Synthetic Libraries Derived from the Optical Constants n(λ), k(λ) for Hyperspectral Imaging
Authors: Myers Tanya L. , Johnson Timothy J. , Bernacki Bruce E. , Yokosuk Michael O. , Lonergan Charmayne E.
Published: November 2021

This paper presents the methods for developing synthetic spectral libraries using the real n(λ) and imaginary k(λ) parts of the complex refractive index for sensors, including hyperspectral sensors, and presents results for solid materials.
Raman Integral Field Spectroscopy
Authors: Baranski Maciej , Singh Gajendra Pratap , Lee Elizabeth , Ram Rajeev , Barbastathis George
Published: November 2021

We present a snapshot imaging spectrometer for spontaneous Raman spectroscopy. The snapshot approach allows parallel acquisition of spatio-spectral data-cubes, thereby reducing measurement time significantly and eliminating motion artefacts.
Multi-Camera Motion Compensation for Remote Monitoring of Heart Rate and Respiration
Authors: Kuramoto Lindsay , Chu Ryan , Ringuette Dene , Zhu Eric , Mihailidis Alex , Levi Ofer
Published: November 2021

We demonstrate a motion-tolerant vital signs monitoring using multiple, depth sensing cameras. Results show successful isolation of the respiratory waveform from walking motion and successful isolation of heart rate from swaying motion.
Photophoretic asymmetry factors for an absorptive dielectric cylinder near a reflecting planar boundary
Authors: Mitri F. G.
Published: November 2021

The effect of a perfectly reflecting boundary (i.e., planar wall) on the photophoretic asymmetry factors (PAFs) for an absorptive dielectric cylinder is investigated. The expression for the normalized intensity function for the electric field internal to the cylinder is used in conjunction with the multiple scattering theory of waves, the translational addition theorem in cylindrical coordinates, and the method of images to derive analytically and compute numerically the longitudinal (L) and transverse (T) PAFs for the cylinder as well as the internal dimensionless intensity function. Both TM- and TE-polarized plane progressive waves with arbitrary incidence (in the polar plane) are considered. Particular emphases are given on the dimensionless size parameter of the cylinder, the incidence angle of the illuminating field, and the dimensionless distance parameter from the flat surface. The results show that the net effect of the planar wall increases or decreases the amplitudes of the PAFs (thus, the photophoretic force and torque), depending on the particle-wall distance, incidence angle, particle size, and the polarization of the incident field. The results of this analysis are useful in applications related to electromagnetic/optical scattering, particle manipulations, optically bound matter, and photophoresis.
Design of autofocusing beams based on accelerating beams
Authors: Wang Xin , Chu Xiuxiang , Zhou Lu
Published: November 2021

Autofocusing Airy-like beams have been designed based on the self-accelerating beams along arbitrary polynomial paths. The evolutions of the autofocusing beam in free space and turbulent atmosphere have been studied. Results show that the energy concentration of the autofocusing beam near the focal plane has a close relationship with its accelerating trajectory. The spot size of the autofocusing beam in the focal plane varies with the acceleration trajectory. The influence of turbulence on different autofocusing beams is different and has a relation with the degree of the curvature of the accelerating beam. The autofocusing beam propagating along a small curvature path has better resistance against turbulence.
Mixture model analysis of transition edge sensor pulse height spectra
Authors: Coakley Kevin J. , Splett Jolene , Gerrits Thomas
Published: November 2021

To calibrate an optical transition edge sensor, for each pulse of the light source (e.g., pulsed laser), one must determine the ratio of the expected number of photons that deposit energy and the expected number of photons created by the laser. Based on the estimated pulse height generated by each energy deposit, we form a pulse height spectrum with features corresponding to different numbers of deposited photons. We model the number of photons that deposit energy per laser pulse as a realization of a Poisson process, and the observed pulse height spectrum with a mixture model method. For each candidate feature set, we determine the expected number of photons that deposit energy per pulse and its associated uncertainty based on the mixture model weights corresponding to that candidate feature set. From training data, we select the optimal feature set according to an uncertainty minimization criterion. We then determine the expected number of photons that deposit energy per pulse and its associated uncertainty for test data that are independent of the training data. Our uncertainty budget accounts for random measurement errors, systematic effects due to mismodeling feature shapes in our mixture model, and possible imperfections in our feature set selection method.
On the dissipative dynamics of entangled states in coupled-cavity quantum electrodynamics arrays
Authors: Mirza Imran M. , Cruz Adriana S.
Published: November 2021

We examine the dissipative dynamics of N00N states with an arbitrary photon number

N

in two architectures of fiber-coupled optical ring resonators (RRs) interacting with two-level quantum emitters (QEs). One architecture consists of a two-way cascaded array of emitter–cavity systems, while in the other architecture, we consider two fiber-coupled RRs, each coupled to multiple dipole–dipole interacting (DDI) QEs. Our focus in this paper is to study how an initially prepared multiple excitation atomic N00N state transfers to the RRs and then how rapidly it decays in these open cavity quantum electrodynamics setups while varying the emitter–cavity coupling strengths, emitter–cavity detuning, and backscattering from cavity modes. We present a general theoretical formalism valid for any arbitrary numbers of QEs, RRs, and

N

numbers in the N00N state for both schemes. As examples, we discuss the cases of single- and two-excitation N00N states and report the comparison of our findings in both schemes. As one of the main results, we conclude that the array scheme tends to store N00N for longer times, while the DDI scheme supports higher fidelity values. The results of this study may find applications in designing new multiparty entanglement-based protocols in quantum metrology and quantum lithography.
Universally Programmable Chip-scale TeraHertz Systems for Future Wireless Communication and Sensing
Authors: Sengupta Kaushik
Published: November 2021

In this paper, we present opportunities for the THz chip-scale technologies in wireless communication and sensing in the next decade.
Aggregating Quantum Networks
Authors: Piparo Nicolo Lo , Hanks Michael , Nemoto Kae , Munro William J.
Published: November 2021

The implementation of quantum error-correction codes needs high efficiency transmission channels and significant physical resources. Here we show that aggregating quantum networks alleviate those issues when applied to the quantum Reed-Salomon code.
Recent Advances in Radiation-Hardened Fiber-Optic Amplifiers for Space-based Laser Communications
Authors: Girard Sylvain , Aubry Marine , Laurent Arnaud , Mescia Luciano , Robin Thierry , Balcon Nicolas , Mekki Julien , Morana Adriana , Marin Emmanuel , Boukenter Aziz , Ouerdane Youcef
Published: November 2021

We review the recent advances concerning the development of radiation tolerant fiber-based optical amplifiers for space applications. Particularly, the combined effects of radiation and temperature on the EDFA or EYDFA performances are discussed highlighting that their radiation vulnerabilities can strongly depend on their profiles of use.
Strong Coupling of porous-embedded CdSe/Zn Quantum Dots and Pseudo-Bandgap Edge States of a Porous-Silicon Conjugated-Fibonacci Array
Authors: Pérez Atzin David Ruiz , Del Rocío Nava Lara Ma. , Reyes-Esqueda Jorge-Alejandro
Published: November 2021

Excitons from CdSe/Zn quantum-dots embedded into a porous-silicon conjugated-Fibonacci array present a strong coupling with array’s pseudo-bandgap region resulting in Rabi-splitting, as evidenced by anticrossing split of central photoluminescence peak when varying angular excitation.
Theoretical Study on the Optoelectronic Properties of Al1-xGaxN-Based Deep UV LEDs with Single and Multiple Quantum Well Heterostructures
Authors: Suwito Galih Ramadana , Shih Ya-Hsuan , Chen Sung-Wen Huang , Zhang Zi-Hui , Kuo Hao-Chung
Published: November 2021

Characteristics of Al1–
x
Ga
x
N-based deep UV LEDs with varied number of Al0.5Ga0.5N/Al0.4Ga0.6N quantum well(s) are theoretically investigated. The effects of quantum design on the internal quantum efficiency, radiative transport, and output power are discussed.
Tunable Assembly and Refractive Index of a Cephalopod Protein-Based Material
Authors: Pratakshya Preeta , Gorodetsky Alon
Published: November 2021

We discuss how the structure and stimuli-responsive assembly of a cephalopod protein variant enable its optical functionality. We establish direct correlations between its structural characteristics and refractive index by leveraging holotomography.
Surface Nonreciprocity in Iron Garnets
Authors: Dash Sushree S , Mukherjee Pinaki , Levy Miguel , Rosenberg Richard , Haskel Daniel
Published: November 2021

Surface reconstruction and electronic transitions are examined. XMCD through total fluorescence yield and total electron yield show evidence of density of state differences between bulk and surface. Surface reconstruction was examined via STEM.
Dynamically Emerging Topological Phase Transitions in Nonlinear Interacting Soliton Lattices
Authors: Bongiovanni Domenico , Jukić Dario , Hu Zhichan , Lunić Frane , Hu Yi , Song Daohong , Morandotti Roberto , Chen Zhigang , Buljan Hrvoje
Published: November 2021

We report dynamical topological phase transitions in evolving Su-Schrieffer-Heeger lattices made of interacting soliton arrays. Dynamics are fully determined by nonlinearity and thereby constitute emergent nonlinear topological phenomena in optics.
New spin-resolved thermal radiation laws for nonreciprocal bianisotropic media
Authors: Khandekar Chinmay , Jacob Zubin
Published: November 2021

We discovered generalized versions of spin-resolved Kirchhoff’s laws of thermal radiation applicable to multilayered or composite planar slabs of reciprocal and nonreciprocal bianisotropic material classes. No such laws were known for nonreciprocal media till date. (e-mail: ckhandek@stanford.edu).
Optical Characterization of A1+xBX3 Crystals
Authors: Mei Hongyan , Salman Jad , Zhao Boyang , Joe Graham , Niu Shanyuan , Zhao Huan , Zhou Yucheng , Orvis Thomas , Huyan Huaixun , Wu Jiangbin , Liu Yang , Wang Han , Ravichandran Jayakanth , Kats Mikhail A.
Published: November 2021

We combine generalized spectroscopic ellipsometry and polarization-resolved infrared micro-spectroscopy to characterize the birefringence and dichroism of several engineered anisotropic A1+xBX3 materials across the infrared wavelength range.
Graphene-Plasmonic Hybrid Metasurface Saturable Absorber
Authors: Rafique Md Zubair Ebne , Basiri Ali , Bai Jing , Zuo Jiawei , Yao Yu
Published: November 2021

We demonstrate saturable absorption and ultrafast recovery of subwavelength (~λ/5) graphene-plasmonic hybrid metasurfaces. Measurements indicate a saturation fluence as low as 0.15μJ/cm2 and a recovery time <60fs at infrared wavelengths.
Toward Mid-Infrared Ultra-Short Pulse Generation in a Gas-Filled Hollow-Core Photonic Crystal fiber
Authors: Fourcade-Dutin Coralie , Miranda Olivia Zurita , Mounaix Patrick , Bigourd Damien
Published: November 2021

We numerically show that when a gas filled hollow-core photonic crystal fiber is pumped by two-color pulses, an ultra-short pulse can be generated in the mid-infrared. This phenomenon is due to the cascaded nonlinear phenomenon starting from a spectral broadening of the two pulses combined with an induced phase-matched four wave-mixing lying in the mid-infrared, with a dispersive wave. By selecting the mid-infrared band with a bandpass filter, we demonstrate the generation of 60 fs pulses at 3-4 µm and an ultra-short pulse duration of 20 fs can be reached with additional phase compensator.
Chip-scale optics for atomic magnetometry
Authors: Yang Xuting , Francis Sarah , Benelajla Meryem , Choy Jennifer T.
Published: November 2021

We develop metasurface-based nanophotonic components for polarization rotation and polarimetry of atomic spins in a compact rubidium-based magnetometer.
Accurate measurements of second-order nonlinear-optical coefficients of LaBGeO5 at UV generating wavelength region
Authors: Tanaka Ryoichi , Hirayama Naoya , Yamanobe Masaki , Shoji Ichiro
Published: November 2021

We accurately measure the second-order nonlinear-optical coefficients of LaBGeO5 at the fundamental wavelength of 532 nm using the wedge technique. The determined of d33 and d22 are 1.15 and 1.41 pm/V, respectively.
Full Poincaré polarimetry for enhanced microscopic sensing
Authors: He Chao , Booth Martin J
Published: November 2021

A new polarisation sensing paradigm circumvents the limitations of traditional approaches. We use a GRIN optic for universal polarisation mapping. Mean errors <1% for each Stokes vector component lead to more sensitive polarimetric microscopy.
uPTI: uniaxial permittivity tensor imaging of intrinsic density and anisotropy
Authors: Yeh Li-Hao , Ivanov Ivan E. , Guo Syuan-Ming , Chhun Bryant B. , Hashemi Ezzat , Han May H. , Mehta Shalin B.
Published: November 2021

We present a label-free computational microscopy method, uPTI, which reports components of uniaxial permittivity tensor, including phase and 3D anisotropy across volumes. We report data from mouse brain tissue to demonstrate how uPTI enables discovery of intrinsic biological architecture.
Polarization-Resolved Second Harmonic Generation for deep 3D characterization of collagen-based scaffold remodeling
Authors: Xydias Dionysios , Ziakas Georgios , Psilodimitrakopoulos Sotiris , Lemonis Andreas , Bagli Eleni , Fotsis Theodore , Gravanis Achille , Tzeranis Dimitrios S. , Stratakis Emmanuel
Published: November 2021

Polarization resolved second harmonic generation has been used to study the evolution of cell induced collagen remodeling in 3D volumes of collagen-based scaffolds seeded endothelial cell, at increasing days in vitro.
Fast holographic scattering compensation for deep tissue biological imaging
Authors: May Molly A. , Kummer Kai K. , Kress Michaela , Ritsch-Marte Monika , Jesacher Alexander
Published: November 2021

We develop a holographic phase-stepping interferometry algorithm for non-invasive scattering compensation that achieves >10x higher signal enhancement after one mode iteration than previous work and enables two-photon imaging in mouse hippocampal tissue down to 530 µm.
Discrete Frequency Infrared Vibrational Circular Dichroism Spectroscopy & Imaging
Authors: Phal Yamuna , Yeh Kevin , Bhargava Rohit
Published: November 2021

Vibrational Circular Dichroism (VCD) arises from chiroptical phenomena in biological samples. We demonstrate VCD imaging, a novel microscopy technique that can provide molecular- and spatially-specific chirality mapping of biological tissues by measuring optical activity.
Deep tissue contractility sensing with biointegrated microlasers
Authors: Schubert Marcel , Woolfson Lewis , Barnard Isla RM , Dorward Amy M , Casement Becky , Caixeiro Soraya , Morton Andrew , Robertson Gavin B , Appleton Paul L , Miles Gareth B , Tucker Carl S , Pitt Samantha J , Gather Malte C
Published: November 2021

Characterizing single cell contractility in the beating heart is strongly limited by light scattering and extreme tissue dynamics. Here, we use tissue-integrated microlasers to measure contractility in live zebrafish and living myocardial slices at a depth several times deeper than multiphoton microscopy-based techniques.
High average output power from a backside-cooled 2-µm InGaSb VECSEL with full gain characterization
Authors: Gaulke Marco , Heidrich Jonas , Özgür Alaydin B. , Golling Matthias , Barh Ajanta , Keller Ursula
Published: November 2021

We compare the gain and continuous wave lasing properties of two InGaSb-based vertical external cavity surface emitting lasers (InGaSb VECSEL) with different heat management approaches operating at a center wavelength of around

2

μ

m

. To date, intracavity heatspreaders have been required for good average output power, which have many trade-offs, especially for passive modelocking. Here we demonstrate a record high average output power of 810 mW without an intracavity heatspreader using a backside-cooled non-resonant VECSEL chip optimized for modelocking. In addition, we introduce and demonstrate an optical characterization for a wavelength range of 1.9 to

3

μ

m

to precisely measure wavelength-dependent gain saturation and spectral gain. Gain characteristics are measured as a function of wavelength, fluence, pump power and temperature. Small signal gain of more than 5%, small saturation fluences and broad gain bandwidths of more than 90 nm are demonstrated. In comparison to a commercial VECSEL chip with an intracavity heatspreader, we have obtained similar average output power even though our VECSEL chip is designed for antiresonance.
Hacking detection based on the elastic properties of liquid crystals in different phases
Authors: Yu Jeong-Seon , Kim Jong-Hyun
Published: November 2021

We present a security device that can detect and block hacking using the characteristics of liquid crystals. This device is based on a liquid crystal cell consisting of a uniformly aligned layer and a photo-alignment layer. To inscribe a pattern, the device is illuminated when the liquid crystal is in the smectic phase. The resulting image is invisible after light irradiation. Heating to the nematic phase improves this alignment and reveals the recorded pattern. Returning to the smectic phase distorts the pattern. Because the pattern is not shown without heating and the trace of the pattern does not disappear once viewed, it is possible to detect whether data has been hacked. The device is easy to fabricate, cost-effective, and sensitive to outside intrusion.
Carrier Enhancement for Multichannel Kramers–Kronig Detection via Self-Seeded Brillouin Amplification
Authors: Zhang Honghui , Zhang Qiulin , Shu Chester
Published: November 2021

We experimentally demonstrate performance improvement of 5×10-Gbaud 16-QAM single-sideband signals using a carrier recovery block enabled by self-seeded Brillouin amplification after 80-km fiber transmission. The optimum average Q factor improvement is 3.0 dB.
Orbital Angular Momentum (OAM) Recognition with Generative Adversarial Network (GAN) based Atmospheric Modeling
Authors: Lu Chenda , Tian Qinghua , Xin Xiangjun , Zhu Lei , Zhang Qi , Yao Haipeng , Chang Huan , Gao Ran
Published: November 2021

We proposed a Generative Adversarial Network (GAN) based atmospheric modeling method which helps with the Orbital angular momentum (OAM) recognition to achieve better accuracy with limited data.
Neural-Network-Based Nonlinearity Equalizer for 128 GBaud Coherent Transcievers
Authors: Neskorniuk Vladislav , Buchali Fred , Bajaj Vinod , Turitsyn Sergei K. , Prilepsky Jaroslaw E. , Aref Vahid
Published: November 2021

We propose an efficient neural-network-based equalization jointly compensating fiber and transceiver nonlinearities for high-symbol-rate coherent short-reach links. Providing about 0.9 dB extra SNR gain, it allows achieving experimentally the record single-channel 1.48 Tbps net rate over 240 km G.652 fiber.
Low-Complexity, Loop-Unrolled Decision-Feedback Equalizer for IM/DD System Using PAM Formats
Authors: Yu Yukui , Che Yi , Bo Tianwai , Kim Daeho , Kim Hoon
Published: November 2021

We propose and demonstrate a low-complexity, loop-unrolled DFE for band-limited IM/DD system. The proposed equalizer nearly doubles the maximum achievable data-rate of DFE for PAM-4 signal, but requires complexity similar to that of NRZ DFE.
Optimization of single-mode optical fibers for strain and temperature discrimination through Brillouin sensing
Authors: Sabatier C. , Sader L. , Adjibodou D. , Mescia L. , Robin T. , Melin G. , Boukenter A. , Ouerdane Y. , Girard S. , Marin E.
Published: November 2021

By combining simulations and experiments, low-loss optical fiber structure was optimized to allow discriminative monitoring of temperature and strain through Brillouin sensing: discrimination capability of ~5°C/MHz and ~100µε/MHz is shown for the best manufactured fiber.
Suppressing non-local effects due to dynamic strain induced Doppler shifts in high-frequency Brillouin sensing
Authors: Murray Joseph B. , Redding Brandon
Published: November 2021

We demonstrate a fundamental limit in Brillouin fiber sensors wherein dynamic strain induced Doppler shifts produce non-local signals throughout the fiber. We present a technique to overcome this barrier, enabling high-bandwidth, low-noise dynamic strain measurements.
Proposal of Pulse Compression Brillouin Optical Time Domain Reflectometry
Authors: Xu Pengbai , Pang Chao , Xu Ou , Dong Xinyong , Yang Jun , Qin Yuwen , Dong Yongkang
Published: November 2021

We propose pulse compression assisted Brillouin optical time-domain reflectometry, which is an intrinsic one-end-injection system that exhibits high spatial resolution, long sensing range, high measurement speed, and may pave the way for various BOTDR applications.
Distributed Multimode Fiber Coherent Φ-OTDR
Authors: Murray Matthew J. , Redding Brandon
Published: November 2021

We demonstrate a distributed multimode fiber Φ-OTDR sensor using holographic detection to record the backscattered speckle field. The sensor detects frequencies up to 400 Hz over 2 km with a sensing aperture of 20 m.
Single-shot Coherent Optical Time Domain Reflectometry with pε/√Hz Strain Sensitivity
Authors: Xiong Ji , Wang Zinan , Wu Yue , Rao Yunjiang
Published: November 2021

In this paper, a novel sub-chirped-pulse extraction algorithm is proposed to replace the time-consuming sweeping process in COTDR and realize single-shot measurement. On a 134m fiber, pε/√Hz strain sensitivity is achieved with 2 m spatial resolution.
Variable Frequency Division Multiplexing Φ-OTDR Based on Chirped Continuous Wave
Authors: jiang Jialin , Wang Zinan , Wang Zitan , Xiong Ji , Rao Yunjiang
Published: November 2021

A novel frequency-division-multiplexing Φ-OTDR based on chirped continuous wave is proposed, whose channel-number is variable in digital domain. Muli-scale analysis in both frequency-domain and time-domain can be realized using the same sensing data set.
A Novel Technique For Loss Compensation in Single-Ended Raman Distributed Temperature Sensors
Authors: Lecoeuche Vincent
Published: November 2021

A novel technique is introduced for the compensation of the losses in single-ended Raman sensors. Narrow linewidth lasers over a narrow spectral window are used, which simplifies the design while opening new perspectives.
A φ-OTDR using Direct Digital Synthesis of Chirps and Sidelobe Suppression with Nonlinear Frequency Modulation
Authors: Muanenda Yonas , Faralli Stefano , Oton Claudio J. , Velha Philippe , Di Pasquale Fabrizio
Published: November 2021

We experimentally demonstrate a novel φ-OTDR scheme using direct digital synthesis of chirps and advanced matched filtering with nonlinear frequency modulation providing ~16 dB improvement in effective suppression of autocorrelation sidelobes over conventional linear chirping.
Optical frequency domain reflectometry based on Brillouin dynamic grating in polarization maintaining fiber
Authors: Kim Young Hoon , Song Kwang Yong
Published: November 2021

Optical frequency-domain reflectometry based on Brillouin dynamic grating (BDG) in polarization maintaining fiber is proposed and experimentally demonstrated for high resolution distributed measurement of Brillouin gain spectra. Distributed strain measurement for a 10.3 m PMF is performed with 1 cm spatial resolution in the feasibility test.
Genetic-Optimized Pulse Coding Technique for Brillouin Distributed Optical Fiber Sensing
Authors: Sun Xizi , Yang Zhisheng , Hong Xiaobin , Zaslawski Simon , Wang Sheng , Soto Marcelo A. , Gao Xia , Wu Jian , Thévenaz Luc
Published: November 2021

A single code sequence designed by a genetic searching algorithm is proposed to enhance the signal-to-noise ratio of Brillouin distributed sensors without hardware modification, enabling high-performance and cost-effective sensing over a 200-km-loop setup.
Denoising of RDTS Based on One-Dimensional Convolutional Neural Networks
Authors: Zhang Zhongshu , Zhao Can , Wu Hao , Tang Ming
Published: November 2021

One-dimensional convolutional neural network is proposed to denoise the signal of Raman distributed temperature sensor. The uncertainty of a 10-km stand-single-mode fiber is reduced from 4 °C to 1 °C.
Distributed strain sensing with large dynamic range based on two-wavelength phase-sensitive OTDR
Authors: Piñeiro Enrique , Sagues Mikel , Mompó Juan José , Eyal Avishay , Loayssa Alayn
Published: November 2021

We demonstrate the use of two-wavelengths to enhance the dynamic range in phase-sensitive OTDR vibration sensors. The system overcomes the phase wrapping con- strains by the synthesis of an equivalent wavelength measurement.
Φ-OFDR based distributed acoustic sensor with 12-cm spatial resolution and sub − n ε / Hz strain resolution
Authors: Li He , Liu Qingwen , Chen Dian , Deng Yuanpeng , He Zuyuan
Published: November 2021

A phase-sensitive optical frequency domain reflectometry based distributed acoustic sensor is proposed. The waveform of a frequency-chirped vibration is recovered with the spatial resolution of 12-cm and the strain resolution of 667-pε/√Hz.
Experimental Analysis of Non-linear Phenomena due to Perturbation Amplitude in ϕ-OTDR Based Fiber Optic Distributed Vibration Sensor
Authors: Uyar Faruk , Kartaloğlu Tolga , Ozbay Ekmel , Ozdur Ibrahim
Published: November 2021

We experimentally analyze the non-linearity effect due to the perturbation amplitude in the ϕ-OTDR based fiber optic distributed vibration sensor by investigating the effects of large disturbance signal.
Virtual Transparency in a Distributed Sensor Using Modulated First-Order Raman Amplification
Authors: Nuño Javier , Martins Hugo F. , Martin-Lopez Sonia , Gonzalez-Herraez Miguel
Published: November 2021

Raman amplification with engineered amplitude modulation is proposed and optimized. A flat trace is experimentally achieved along 50 km without significant SNR penalty. Moreover, the pump power is reduced comparing to the continuous pump case.
Enhanced Sensitivity High Spatial Resolution Distributed Acoustic Sensing Using Optical Frequency Domain Reflectometry and a Point Reflector Array Sensor
Authors: Kreger Stephen , Rountree Derek , Park Jaewon , Donko Andrei , Beresna Martynas , Masoudi Ali , Brambilla Gilberto
Published: November 2021

Acoustics can be sensed with high spatial resolution by analyzing fiber Rayleigh scatter with optical frequency domain reflectometry, but signal-to-noise levels are low. Writing an array of discrete reflectors in fiber with a fs-pulsed laser increases returned light and leads to significant improvements in signal-to-noise levels and dynamic range.
Tri-Component Fiber-Optic Interferometric Accelerometer Based on Weak Fiber Bragg Grating Array
Authors: Cai Longbao , Liang Lei , Li Chengli , Jiang Yanshi , Yang Minghong , Tang Jianguan
Published: November 2021

A tri-component (3-C) fiber-optic interferometric accelerometer using weak fiber Bragg grating array is proposed and tested. Experimental results showed that the axis sensitivity was about 55 dB and the suppression effect of cross-axil sensitivity is 30 dB in the frequency range of 5 Hz ~ 120 Hz.
Investigation of Variation in Measured Temperature Across Different Fibers in Optical Phase Conductor Cable using Distributed Anti-Stokes Raman Thermometry
Authors: Datta Amitabha , S Viswanathan , Srinivasan Balaji
Published: November 2021

We investigate the variation of temperature across different optical fibers in an Optical Phase Conductor power cable using Distributed Anti-Stokes Raman Thermometry. Experimental results on the temperature variation are supported by COMSOL simulation results.
Boron Nitride Nanotubes for Optical Fiber Sensor Applications
Authors: Ding Huimin , Guan Jingwen , Lu Ping , Mihailov Stephen J. , Kingston Christopher T. , Simard Benoit
Published: November 2021

Boron nitride nanotubes (BNNTs) are demonstrated for use in optical fiber sensor applications. A BNNT coated tapered optical fiber sensor has been developed to detect various liquids and gases with enhanced sensitivity and selectivity.
Bending-induced resonant couplings between the central and the side-core in helically twisted fiber
Authors: Zolnacz Kinga , Napiorkowski Maciej , Peter Maciej , Urbanczyk Waclaw , Kiczor Anna , Makara Mariusz , Mergo Pawel
Published: November 2021

We report on a new type of long-period-grating generated in a helical core fiber by bending. The grating arises from bent-induced cosinusoidal modulation of an optical path of the mode guided in the helical core with a period equal to the helix pitch. It induces multiple resonant couplings between the fundamental modes guided in the central core and the helical side-core.
Disposable fiber laser biosensor for statistical analysis of protein concentration
Authors: Yang Xi , Wang Yanqiong , Gong Yuan , Peng Gang-Ding , Rao Yun-Jiang
Published: November 2021

Disposable optofluidic laser biosensors based on hollow optical fibers (HOFs) are developed. The statistical characteristics of multiple tests greatly reduce the bioassay uncertainty.
Prediction of Optical Sensor Behaviors in a Nuclear Reactor Core using Temporal Convolutional Networks
Authors: Wu Zekun , Bayoumy Mohamed , Hnatovsky Cyril , Mihailov Stephen , Carpenter David , Li Ming-Jun , Daw Joshua , Chen Kevin P.
Published: November 2021

Fiber optic sensor inscribed in radiation-harden fibers can withstand high neutron flux in an operating nuclear reactor. Machine-learning algorithm using temporal convolutional networks was used to mitigate sensor drift and abnormal event prediction.
Femtosecond Laser Direct Writing of Turn Around Point Long Period Fiber Gratings Coated with Titanium Dioxide for Improved Sensitivity
Authors: Viveiros Duarte , de Almeida José M. M. M. , Coelho L. , Vasconcelos Helena , Maia João M. , Vítor  , Amorim A. , Jorge Pedro A. S. , Marques P. V. S.
Published: November 2021

The fabrication of Turn Around Point Long Period Fiber Grating in standard SMF-28e fibers through femtosecond laser direct writing is demonstrated and its sensing sensitivity is improved by coating the fiber with titanium dioxide through physical vapor deposition.
Oil pipeline leak detection using through-the-coating written fiber Bragg grating sensors
Authors: Mihailov Stephen J. , Walker Robert B. , Neumann James , De Silva Manny , Grobnic Dan , Hnatovsky Cyril
Published: November 2021

Pipeline leak detection sensors are created by using fiber Bragg gratings (FBGs) that are inscribed through polyimide coatings of optical fiber with an infrared femtosecond laser and then specially packaged in materials susceptible to hydrocarbons. Depending on the sensor geometry, strain is either applied or released upon exposure to toluene or crude oil.