bluuebunny/crossref_metadata_2025 huggingface dataset:
Physical activity of individuals with Parkinson’s in social isolation before and during the pandemic COVID-19
Authors: Moratelli Jéssica Amaro , Sonza Anelise , Haas Aline Nogueira , Passos-Monteiro Elren , Corrêa Clynton Lourenço , Peyré-Tartaruga Leonardo Alexandre , Delabary Marcela dos Santos , Guimarães Adriana Coutinho de Azevedo
Published: January 2022

The world has been hit by a pandemic caused by the new coronavirus (COVID 19), which has resulted in government recommendations and measures including social isolation to reduce the spread of the disease. In view of these recommendations, there were drastic changes in lifestyle, impacting the physical and mental health of men and women. Thus, this study aimed to investigate the practice of physical activity, according to sex, in individuals with Parkinson’s disease in social isolation before and during the COVID-19 pandemic. Cross-sectional observational study, based on an online questionnaire validated for individuals with Parkinson’s disease PAFPA/COVID19, in which 156 individuals of both sexes and degrees of the disease (I to V) were allocated, with a mean age of 63.70 ± 11.00 years and from different Brazilian regions. Chi-square, Fisher’s exact and binary logistic regression tests were used. It is observed that 92% of the participants  were in social isolation, which caused negative effects on the level of physical activity of the participants, even though most of them doing physical activity online. In addition, it was found that those who participated in specific exercise programs for Parkinson’s disease, are less likely to be insufficiently active, as well as individuals who receive online guidance. Although social isolation is a necessary measure to combat COVID-19, the results show a negative effect of this social isolation on the parameters of physical activity in this population in different regions of Brazil. This suggests that better strategies for health promotion in order to increase levels of physical activity at home are necessary to reduce the physical inactivity lifestyle during the pandemic, in order to prevent diseases associated with social isolation and physical inactivity.
Fiber-based acetylene frequency stabilization of a potassium laser cooling system
Authors: Cherfan Charbel , Denis Maxime , Manai Isam , Zemmouri Samir , Garreau Jean-Claude , Clément Jean-François , Szriftgiser Pascal , Chicireanu Radu
Published: January 2022

We present a compact laser frequency stabilization system based on saturated absorption spectroscopy of acetylene in the telecommunication domain, and utilize it as the only frequency references for a potassium cold-atom experiment.
Single-shot resolving soliton interaction
Authors: Xian Tianhao , Wang Wenchao , Wu Jian , Zhan Li
Published: January 2022

The soliton interaction dynamics in harmonic mode-locked laser is experimentally revealed in time and phase domains for the first time. The mismatch evolutions of long-range inter-soliton time separation and relative phase is unveiled.
Enhanced Light-Matter Interaction in TMDC-Materials by Integration in Resonant Layer Architectures
Authors: Knopf Heiko , Ngo Gia Quyet , Abtahi Fatemeh Alsadat , Bernet Simon , George Antony , Najafidehaghani Emad , Gan Ziyang , Lackner Lukas , Rupprecht Christoph , Shan Hangyong , Weissflog Maximilian , Vogl Tobias , Turchanin Andrey , Schulz Ulrike , Schröder Sven , Schneider Christian , Höfling Sven , Eilenberger Falk
Published: January 2022

We demonstrate double-resonantly enhanced SH harmonic generation at 402 ± 0.5 nm of encapsulated WS2-flakes, as shown in Figure 1b+c, pumped at 805 ± 1 nm, including quadratic energy dependency and polarization dependency and discuss possible generalization schemes. The resonator is implemented as a monolithic element composed of a pair of DBRs and a dielectric spacer, which contains a layer of monolayer crystals.
Spectral laser doppler holography (SLDH) for human retinal blood flow visualization and quantification in vivo
Authors: Borycki Dawid , Auksorius Egidijus , Węgrzyn Piotr , Liżewski Kamil , Tomczewski Sławomir , Žičkienė Ieva , Adomavičius Karolis , Wojtkowski Maciej
Published: January 2022

We developed and applied spectral laser doppler holography (SLDH) to Fourier-Domain Full-Field Optical Coherence Tomography (FD-FF-OCT) enabling visualization and quantification of the human retinal blood flow at high speeds and high transverse resolution in vivo.
Spectral interferometric confocal microscopy using interferometry objectives and synthetic-phase modulation
Authors: Canales-Benavides Arturo A , Carney P Scott
Published: January 2022

We present an implementation for phase-sensitive, coherent-noise-free spectral interferometric confocal microscopy using interferometry objectives in combination with a piezo-based sinusoidal synthetic-phase modulation approach.
Non-Hermitian Temporal Coupled-Mode Theory: Effects of Imaginary Couplings on Exceptional Points
Authors: Takata Kenta , Roberts Nathan , Shinya Akihiko , Notomi Masaya
Published: January 2022

We reveal imaginary coupling components in the coupled-mode theory for evanescently coupled cavities with gain and loss. We show how exceptional points are resolved and restored in such systems where their effects are generally inevitable.
Entirely 3D Printed Spectrometer: Application of Consumer-grade Printing Technologies for Fabrication of Optical and Opto-mechanical Components
Authors: Berglund Gregory , Tkaczyk Tomasz
Published: January 2022

This paper presents a successful demonstration of a spectrometer device fully printed on consumer-grade 3D printers. Optical components were made with SLA technology while FDM printing was applied to fabricate opto-mechanical and casing components.
A Field-deployable Optical Clockwork Capable of Supporting Instabilities Below 1×10-17
Authors: Timmers Henry , Tooley Dylan , Sodergren Bennett , Sower Kyle , Barnes Evan , Attar Andrew , Vogel Kurt , Knabe Kevin
Published: January 2022

A field-deployable optical clockwork with in-loop instabilities below 1×10-17 is presented. Individual optical subsystem performance is analyzed, and the potential for integration into next-generation quantum sensors is discussed.
Universal Behavior of the Scattering Matrix Near Thresholds in Photonics
Authors: Wojcik Casey , Wang Haiwen , Orenstein Meir , Fan Shanhui
Published: January 2022

We show that unitarity, reciprocity, and time-reversal symmetry strongly con- strain the scattering matrix near thresholds. We demonstrate this universality in a photonic crystal slab, a planar interface, and a metallic waveguide junction.
A Quantum Optical Microphone in the Audio Band
Authors: Nold Raphael , Babin Charles , Schmidt Joel , Linkewitz Tobias , Pérez María , Stöhr Zaballos Rainer , Kolesov Roman , Vorobev Vadim , Lukin Daniil , Boppert Rüdiger , Barz Stefanie , Vuckovic Jelena , Gebhardt Christof , Kaiser Florian , Wrachtrup Jörg
Published: January 2022

We demonstrate a sub-shot noise quantum optical sensor combining path entan- glement and standard intensity detection. Exploiting our exceptionally high sampling rates (100 kHz), we implement an optical microphone, allowing humans to hear the quantum advantage.
Mueller polarimetric imaging of cervical tissue for pregnant women
Authors: Park Junha , Rehbinder Jean , Vizet Jeremy , Vanel Jean-Charles , Nazac André , Pierangelo Angelo
Published: January 2022

Mueller polarimetric imaging is suitable for assessing the anisotropic and scattering properties of cervix. The extracellular matrix remodeling of cervical tissue in pregnant women is investigated using a Mueller Polarimetric Colposcope in vivo.
Refractive index measured by common path interferometry for solvents from visible to infrared
Authors: Chang Hao-Jung , Munera Natalia , Keyser Christian , Webster Scott , Van Stryland Eric W. , Hagan David H.
Published: January 2022

We develop a common path interferometer to measure the refractive index of liquids from the visible to infrared. In this work, we present experimental data and comparison of several organic solvents.
Nanofabricated and Integrated Colour Centres in Silicon Carbide with High-Coherence Spin-Optical Properties
Authors: Babin Charles , Stöhr Rainer , Morioka Naoya , Linkewitz Tobias , Steidl Timo , Wörnle Raphael , Liu Di , Vorobyov Vadim , Denisenko Andrej , Hentschel Mario , Gobert Christian , Berwian Patrick , Astakhov Georgy , Knolle Wolfgang , Majety Sridhar , Saha Pranta , Radulaski Marina , Son Nguyen Tien , Ul-Hassan Jawad , Kaiser Florian , Wrachtrup Jörg
Published: January 2022

We demonstrate robust spin-optical properties of silicon vacancy centers in 4H-SiC after Helium-ion implantation and integration in nanophotonic-waveguides. For the latter, we show controlled operations on nuclear spin, with near-unity fidelity.
Integrated photonic four-wave-mixing optical synthesizer
Authors: Black Jennifer A. , Newman Zachary L. , Yu Su-Peng , Carlson David R. , Papp Scott B.
Published: January 2022

We present an integrated photonic optical synthesizer using four-wave-mixing based spectral translation. Our synthesizer operates with < 0.1 Hz accuracy and a fractional frequency precision of 4.8 × 10-13 at 1 second.
Reduce Computational Complexity! Inspiration from Flies
Authors: Vuong Luat T.
Published: January 2022

Inspired by the clustered typologies of arthropod corneal nanostructures, we study optical preprocessing. We use topological defects to enhance optical encoders. These encoders enable shallow neural networks to process visual data with reduced computational complexity.
Non-perturbative focus diagnostics of 100-TW-class Laser Pulses
Authors: Isono Fumika , van Tilborg Jeroen , Barber Samuel K. , Natal Joseph , Berger Curtis , Tsai Hai-En , Ostermayr Tobias , Gonsalves Anthony , Geddes Cameron , Esarey Eric
Published: January 2022

We present an online, non-destructive laser diagnostic capable of measuring the transverse position/pointing angle at focus of a 100-TW laser system using double-surface-coated wedged-mirror design for the final steering optic in the laser line.
Industrial Development of Graphene Electronic and Optical Devices
Authors: Guiney Ivor , Badcock Tom , Tingay John
Published: January 2022

There are few graphene electronic products. Reasons include graphene non-uniformity; silicon incompatibility; and high production costs. Paragraf has solved these issues. We discuss our research and products using our graphene synthesis technique.
Dual-wavelength mode-locked erbium-doped fiber laser based on tungsten ditelluride coated fiber taper
Authors: Liu Ya , Yang Jie , Zhu Zhigao , Tan Xin , Hu Guoqing , Yan Peiguang
Published: January 2022

A dual-wavelength mode-locked fiber laser based on a polarization-dependent tungsten ditelluride coated fiber taper is demonstrated. Mode-locking at ~1530 nm and ~1556 nm simultaneously could be realized by simply tuning the intracavity loss.
The New Multimode Optics - Understanding and Exploiting Controllable Complexity
Authors: Miller David A. B.
Published: January 2022

Technologies like silicon photonics allow complex optics. Emerging applications in communications, sensing, and classical and quantum information processing demand complex controllable circuits. Recent advances in novel interferometric mesh architectures, new algorithmic approaches to control, including self-configuring and self-stabilizing circuits, and a clarified modal mathematical approach, promise sophisticated and highly functional circuits beyond previous optics.
Quantum acceleration in adaptive modal imaging of N stars
Authors: Bao Fanglin , Choi Hyunsoo , Aggarwal Vaneet , Jacob Zubin
Published: January 2022

Traditional direct imaging of point sources in the sub-Rayleigh region usually needs prohibitively-long integration time. Here we propose quantum-accelerated imaging (QAI) to significantly reduce the measurement time using an information-theoretic approach.
Multi-Photonic Entanglement, A Geometric Approach
Authors: Xie Songbo , Eberly Joseph H.
Published: January 2022

A new genuine tripartite entanglement measure is revealed, interpreted as the area of a so-called concurrence triangle. The new measure is found superior to previous attempts. Specific examples are illustrated.
Waveguide-Based Spontaneous Parametric Downconversion Sources of Polarization-Entangled Photon Pairs
Authors: Meier Kristina A. , Johnson Spencer J. , Aller Josh , Slezak Brad , Roberts Tony , Battle Phil , Kwiat Paul G.
Published: January 2022

We present waveguide-based SPDC sources for producing both degenerate and highly nondegenerate polarization-entangled photon pairs. We measure entanglement metrics of up to 99% through optimization of both temporal and spectral overlap.
Compact, Pull-in-Free Electrostatic MEMS Actuated Tunable Ring Resonator for Optical Multiplexing
Authors: Ruyack Alexander R. , Grine Alejandro J. , Finnegan Patrick S. , Serkland Darwin K. , Robinson Samuel , Weatherred Scott , Frost Megan , Nordquist Christopher D. , Wood Michael G.
Published: January 2022

We present an optical wavelength division multiplexer enabled by a ring resonator tuned by MEMS electrostatic actuation. Analytical analysis, simulation and fabrication are discussed leading to results showing controlled tuning greater than one FSR.
SDM, Power Efficiency and Current Submarine Systems
Authors: Cai Jin-Xing
Published: January 2022

We review the most recent achievements in undersea transmission with high optical power efficiency and the associated enabling technologies.
High-dimensional Stokes-space spatial beam analyzer
Authors: Dahl Daniel S. , Plöschner Martin , Fontaine Nicolas K. , Carpenter Joel
Published: January 2022

We demonstrate a device for measuring the generalized Stokes parameters of a six spatial mode beam. The device is a single-shot wavefront sensor measuring spatial complex amplitude and coherence without an external phase reference.
Photodetector Performance Prediction with Machine Learning
Authors: Simsek Ergun , Mahabadi Seyed Ehsan Jamali , Carruthers Thomas F. , Menyuk Curtis R.
Published: January 2022

Four machine learning algorithms are tested to predict the performance metrics of modified uni-traveling carrier photodetectors from their design parameters. The highest accuracy (> 94%) is achieved with artificial neural networks.
Ultrafast optical rotation in chiral molecules with ultrashort and tightly focused beams
Authors: Ayuso David , Ordonez Andres , Ivanov Misha , Smirnova Olga
Published: January 2022

We introduce ultrafast optical rotation: a highly efficient method for chiral discrimination using ultrashort pulses. Sub-cycle optical control enables full control over the enantio-sensitive response of matter in a molecule-specific manner and on ultrafast timescales.
Exploring Fabrication Limits for UV Guiding Hollow Core Anti-Resonant Fiber
Authors: Jackson Gregory , Bradley Thomas D , Jasion Gregory T , Poletti Francesco
Published: January 2022

We report a preform scaling technique to fabricate hollow-core Nested Antiresonant Nodeless Fiber (NANF) for guiding ultraviolet wavelengths. We demonstrate that fabrication of NANFs with membrane thicknesses of ~100nm and yields of 1km are possible.
Experimental Generation of Near-Diffraction-Free OAM Pulses Having a Controllable Group Velocity from 1.0069c-0.9933c by Coherently Combining Different Beams of Multiple Correlated Bessel Modes and Frequencies
Authors: Pang Kai , Zou Kaiheng , Song Hao , Karpov Maxim , Yessenov Murat , Zhao Zhe , Minoofar Amir , Zhang Runzhou , Song Haoqian , Zhou Huibin , Su Xinzhou , Hu Nanzhe , Kippenberg Tobias J. , Abouraddy Ayman F. , Tur Moshe , Willner Alan E.
Published: January 2022

We experimentally demonstrate the generation of near-diffraction-free OAM +1 and +3 pulses having a controllable group velocity from 1.0069c-0.9933c. The diffraction of such OAM pulses and the effects of transmitter aperture size are also explored.
Feedback Control Circuit Implementation in a Fiber Loop SOA-Optical Frequency Comb Generator
Authors: do Nascimento Danierick V.G. , Bordonalli Aldário C.
Published: January 2022

A feedback control circuit was designed for amplitude and phase stabilization in a SOA- based recirculating fiber loop optical frequency comb generator. Amplitude and wavelength stabilities were achieved for an OFCG with increased comb line number.
Efficient Holographic Excitation of Modes in Hollow-Core Photonic Crystal Fibre
Authors: Mouthaan Ralf , Christopher Peter , Frosz Michael , Gordon George , Wilkinson Timothy , Euser Tijmen
Published: January 2022

We present a rigorous method for the efficient holographic excitation of high- purity modes in arbitrary geometry waveguides. The technique is demonstrated using a simplified antiresonant hollow-core photonic crystal fibre.
Optical Vortex Brillouin Laser in Chiral Photonic Crystal Fiber
Authors: Zeng X. , Chen Y. , Wang Zheqi , Frosz M. H. , Roth P. , Wong G. K. L. , Russell P. St. J. , Stiller B.
Published: January 2022

We report the first experimental study of stimulated Brillouin scattering and Brillouin lasing by circularly polarized vortex modes in chiral photonic crystal fibers, and demonstrate conservation of spin and orbital angular momentum.
A Study on the Analysis of the Raman Spectra of Furin and Peptide-O
Authors: Ghosh Shreya , Schwartz Joel , Dutta Mitra , Stroscio Michael
Published: January 2022

Furin and Peptide-O (PepO) play significant roles in several biological processes. Therefore, their Raman spectra can be useful to researchers. Here, we have obtained and characterized the Raman spectrum of furin and PepO.
Spontaneous Brillouin Scattering in Gas-filled Anti-resonant Fibre
Authors: Galal Malak , Zhang Li , Yang Fan , Sebastian Suneetha , Gao Shoufei , Wang Yingying , Thévenaz Luc
Published: January 2022

Spontaneous Brillouin scattering is measured for the first time in a hollow-core anti-resonant fibre (HC-ARF) filled with Nitrogen (N2) gas at different pressures. A Brillouin gain of 0.029 m
−
1W
−
1 is yielded at a pressure of 34.7 bar.
Genetic Algorithm optimization for Scatter Correction in Bone
Authors: Liversage Adrian R. , Zheng Tianyi , Tehrani Kayvan F. , Kner Peter , Mortensen Luke J.
Published: January 2022

Implementing a standard Adaptive Optics microscope with an additional DMD, an SHG PSF beyond the mean-free path is used as a seed for the Genetic Algorithm, recovering the PSF by manipulation of the DMD.
Experimental Results for a Hybrid SDM and WDM System Using Commercially Available Transceivers
Authors: Su Ce , Harish Swaroopini , Tu Mingxuan , Murshid Syed
Published: January 2022

This paper demonstrates a two-channel SDM system in a single core multimode fiber that complements WDM. Each SDM channel carries C-band and O-band WDM signals operating at 10 Gbps to enable 40 Gbps over the multimode fiber.
Statistical Analysis of a Random Fiber Laser With Er-Doped Fiber as Gain and Feedback Medium
Authors: Lima Bismarck Costa , Tovar Pedro , von der Weid Jean Pierre
Published: January 2022

A Random Fiber Laser is demonstrated with feedback from the Rayleigh scattered light from the Er-doped fiber gain medium. Laser threshold is characterized and the correlation analysis of emitted intensities indicates strong mode competition.
Synthesis of Space-time Wave Packets Localized in All Dimensions
Authors: Yessenov Murat , Chen Zhaozhong , Lavery Martin P. J. , Abouraddy Ayman F.
Published: January 2022

We present the first demonstration of space-time wave packets localized in all (3+1)D dimensions undergirded by tight spatio-temporal correlation. We confirm the diffraction-free and dispersion-free propagation in free space and compare them with that of pulsed Bessel beam.
Metamaterial Waveguide Modelling by an Artificial Neural Network with Genetic Algorithm
Authors: Cerqueira Roney das Mercês , Sisnando Anderson Dourado , Esquerre Vitaly Felix Rodriguez
Published: January 2022

We implement a hybrid artificial neural network (ANN) for the analysis of dielectric and metamaterial based waveguides operating in the wavelength spectrum of the infrared where long propagation lengths can be observed.
Clock Synchronization using the Quantum Zeno Effect
Authors: Shringarpure Saurabh U. , Franson James D.
Published: January 2022

We investigate the use of the quantum Zeno effect to prevent the desynchronization of two-level atomic clocks by frequently measuring an observable of the combined state of the system.
Entanglement of Photonic Angular Qudits
Authors: Puentes Graciana , Sorelli Giacomo
Published: January 2022

We report a scheme to generate maximally entangled states in D-dimensional quantum systems using angular diffraction masks containing N=D
1/2
angular slits in the arms of correlated twin photons produced by Spontaneous Parametric Down Conversion (SPDC).
Collisions of Moving Gap Solitons in a Nonlinear Dual-Core System with a Uniform Bragg Grating and a Bragg Grating with Dispersive Reflectivity
Authors: Hossain Md. Bellal , Atai Javid
Published: January 2022

We analyze the dynamics of colliding moving solitons in a dual-core system where one core possesses a uniform Bragg grating and the other core has a Bragg grating with dispersive reflectivity.
Interaction of solitons in a semilinear dual-core Bragg grating with phase mismatch
Authors: Saha Shuvashis , Atai Javid
Published: January 2022

We investigate the interaction dynamics between two co-propagating quiescent gap solitons in a semilinear dual-core model where both cores have Bragg gratings with phase mismatch.
Multimode Fiber Differential Imaging Based on Singular Value Decomposition
Authors: Gao Weiwei , Mo Huixia , Wu Guohua , Yang Dongyue , Yin Longfei
Published: January 2022

Multimode fiber differential imaging based on singular value decomposition is proposed to improve imaging quality by constructing an orthogonal matrix and subtracting a background noise, for both singular value decomposition and differential imaging.
Unbiased No-Switching Continuous-Variable Quantum Key Distribution
Authors: Bian Yiming , Sun Fengkai , Zhang Yichen
Published: January 2022

We report a practical no-switching continuous-variable quantum key distribution protocol with unbiased quadrature detection, which shows the potential to compensate for the asymmetry imperfections of practical heterodyne detector.
The Utility of Linear Approximation of Image Transmission through Multimode Fiber
Authors: Liu Yuanhang , Xiang Yangyang , Lan Mingying , Li Junhui , Gao Li
Published: January 2022

Utility of light intensity based linear approximation of image transmission through multimode fiber is undermined by simple neural network modeling, i.e., single full connection layer with ReLU activation, necessitates inclusion of nonlinearity.
Broadband comb-like supercontinuum generation with tunable repetition rate using two-pulse bound state
Authors: Chen Shijie , Zhou Renlai , Liu Xuanyi , Fu H. Y. , Li Qian
Published: January 2022

We theoretically and experimentally demonstrate the 18.986 GHz, 274-nm-wide comb- like supercontinuum generation using two-pulse bound state. The repetition rate can be adjusted by changing the pulse separation.
Resonator-free sub-MHz spectral feature using polarization-dependent gain in a spun fiber
Authors: Choksi Neel , Liu Yi , Ghasemi Rojina , Qian Li
Published: January 2022

We demonstrate a novel resonator-free approach to realize tunable, sub-MHz features by exploiting gain-enhanced polarization pulling in a spun fiber. A 0.72 MHz dip is experimentally achieved, equivalent to a Q-factor approaching 1 billion.
Ultraviolet Disinfection System with Autonomous Targeting
Authors: Zierdt Ben , DeGroat Thomas , Furman Samuel , Papas Nicholas , Smoot Zachary , Shi Taichu , Qi Yang , Wu Ben
Published: January 2022

We proposed and demonstrated a UV disinfection system by using a galvo system as hardware and machine learning as software to tactically disinfect common items rather than a broad case use.
Vibration-Tolerant Design of Free-Space Optical Links for Datacenters
Authors: Zheng Kai , Curran Max , Gupta Himanshu , Longtin Jon
Published: January 2022

Free space optical links can be used in datacenter networks to overcome wired network architecture. We present robust design concepts to maximize optical misalignment tolerance for free space optical links in the presence of vibration.
Polarization label-free microscopy imaging of biological samples by exploiting the Zeeman Laser emission
Authors: Callegari F. , Le Gratiet A. , Zunino A. , Mohebi A. , Bianchini P. , Sheppard Colin JR , Diaspro A.
Published: January 2022

In this work, we exploited the dual-frequency, dual-polarization emission of a Zeeman laser acting as illumination stage of a multimodal optical scanning microscope to obtain polarization-resolved images of biological samples.
Backward Acceleration of Electrons by a Radially Polarized Ultra-Intense Laser Focus During Ionization of High Charge State of Neon
Authors: El Houda Hissi Nour , Chowdhury Enam A.
Published: January 2022

We investigate direct acceleration of electrons produced during ionization of Neon gas using tightly focused and radially polarized Petawatt-class short pulse lasers. Backwards propagation is demonstrated at specific initial conditions of Neon ions.
Polarization-Entanglement Complementary Relation of Light with Center-of-Mass Geometric Representation
Authors: Izadi Misagh , Qian Xiaofeng
Published: January 2022

We report a universal complementary relation between optical polarization and entanglement for general arbitrary light fields. A novel geometric representation via the mechanical center-of-mass interpretation is also demonstrated.
Towards All-Integrated Optical Nanometrology
Authors: Beck Paul , Schulz Sebastian A. , Bag Ankan , Morichetti Francesco , Banzer Peter
Published: January 2022

We discuss an all-integrated photonic chip for high-precision localization and other nanometrological tasks. The proposed photonic device drastically reduces the foot- print of previous techniques and involves bespoke components and detection schemes.
Investigation of High-Precision Laser Instrument for Distance and Displacement Measurements
Authors: Minin Iurii , Bulatov Igor , Korobov Nikita , Dubrov Mstislav , Fedorov Maxim
Published: January 2022

The novel high-precision measurement method was proposed. The considered method possesses laser-interferometric precision, does not require to move any external mirrors over full measuring basis, and can be applied to measure distances of 10
−
2−105 m.
A Novel Nanolaser Using Gain Metamaterial Waveguide
Authors: Awad Ehab
Published: January 2022

A Nanolaser is demonstrated using novel silicon-compatible gain metamaterial waveguide. It has periodic gain stripes and air gaps. It allows efficient pump absorption and lasing with almost ideal internal quantum efficiency and low lasing threshold.
A Highly-Efficiency NIR Plasmonic Long-Wavelength Cut-Off Filter based on Stepped Impedance Resonators
Authors: Ebadi Seyed Morteza , Örtegren Jonas , Yan Max
Published: January 2022

We report design and simulation results of a high-efficiency long-wavelength cut-off filter realized by stepped impedance resonators. Moreover, numerical results confirm by modulating the length of resonator, cut-off wavelength can be easily tuned.
Spectral Modulations of High Harmonic Generation in Extreme High-power Chirped Pulses
Authors: Levi Raz Halifa , Levanon Ori Ildis Assaf , Pomerantz Ishay
Published: January 2022

We demonstrate the spectral splitting of high-harmonics generated from gas, when an extreme amount of temporal chirp is applied to a 20 TW peak power driving laser pulse.
Measuring the Nonlinear Refractive index of Methylene Blue in the Femtosecond Regimen
Authors: Palacio Sebastian Vergara , Alvarez Carlos A. , Herrera Rodrigo Acuna , Torres Pedro
Published: January 2022

The Z-scan technique was used to experimentally study the behavior of the non-linear refractive index n2 of methylene blue by using a laser source at 780nm nm and at different pulse widths in the femtosecond regime.
Photoconductivity mechanism in monolayer MoS2
Authors: Redkin M. , Datsenko O.I. , Babich D. , Kondratenko S.
Published: January 2022

Understanding the photoconductivity mechanisms in two-dimensional materials is essential for future optoelectronic applications. Through the photoconductivity experiments under continuous light excitation or using modulated excitation in the temperature range of 10-300 K, we probe the mechanisms of lateral photoconductivity in monolayer MoS2.
Narrow-linewidth tunable Er-doped fiber laser based on fs-pulse-inscribed artificial Rayleigh reflector
Authors: Skvortsov M. I. , Wolf A.A. , Egorova O.N. , Semjonov S.L. , Proskurina K.V. , Dostovalov A.V. , Vlasov A. A. , Churin A.E. , Babin S. A.
Published: January 2022

We present a narrow-linewidth random Er-doped fiber laser based on fs-pulse-inscribed artificial Rayleigh reflector. A single-frequency regime with 500 Hz linewidth was observed at 1.5 mW output power, and few-mode regime at 12 mW.
Angular Coding Evaluation for Pixelated Holographic Near- Eye Display
Authors: Martinez Christophe , Colard Matthias , Gentet Marie-Claude , Lee Yann , Legentil Paul , Meunier-Della-Gatta Sylvia
Published: January 2022

We describe our first results on the angular coding of images in pixelated holograms for potential retinal projection devices. We present the set-ups used to record and recover the holograms together with first coding strategies.
Plasmonic Band Shift in Gold Nanoparticles During the Phase Separation in Glass
Authors: Shakhgildyan Georgiy Yu. , Avakyan Leon A. , Ziatdinova Mariam Z. , Sigaev Vladimir N.
Published: January 2022

100-nm plasmonic redshift in gold nanoparticles dispersed in glass was studied. Computer simulations revealed that phenomenon is driven by the increase of the local refractive index due to the liquid-phase separation in glass.
Optical fiber strain sensor for real-time food deformation measurements in drying
Authors: Jafarishad Hamed , Li Mucheng , Liu Yuxiang
Published: January 2022

An optical fiber strain sensor was developed for food samples. We demonstrated up to 20% strain measurements of fresh banana slices during drying. The sensor can help understand the deformation of foods and biomedical samples.
Propagation Invariant Features of Aberration Laser Beams in a Turbulent Media
Authors: Dev Vasu , Reddy A.N.K. , Ustinov Andrey V. , Khonina S.N. , Pal Vishwa
Published: January 2022

We study the propagation properties of aberration laser beams in a turbulent media. Our results show that the autofocusing and self-healing properties remain invariant in turbulent media under weak, moderate, and strong turbulence conditions.
Viewing label-free white blood cells using phase-only spatial light modulator
Authors: Ibrahim Dahi Ghareab Abdelsalam , Bakr R. H.
Published: January 2022

We present a method for viewing white blood cells (WBCs) with no dye using phase-only spatial light modulator (SLM). This non-destructive technique can be used for rapid investigation of white blood cells in three-dimensional (3D).
Enhanced-Genetic-Algorithm-Based Absorption Performance Optimization of Epsilon-Near-Zero Multilayer
Authors: Wang Yuqing , Wu Jiaye , Huang Chenxingyu , Fu H. Y. , Li Qian
Published: January 2022

By using enhanced genetic algorithm, the peak absorption of the 600 nm 6-layer ENZ multilayer is increased from 0.91 to 0.95 and the absorption bandwidth is broadened from 120 nm to 227 nm.
Demonstration of Plasmonic Multilayer Coating for Passive Heating
Authors: Asad Muhammad Saad , Alam Muhammad
Published: January 2022

We investigated planar multilayer architecture for design of transparent solar energy harvesting coatings for passive heating applications. The coating increased surface temperature by 7℃ and demonstrated maximum visible transparency of 32.5%.
Spatial Coherence Measurement via Spatiotemporal Light Modulation Using a Digital Micromirror Device
Authors: Shirai Tomohiro , Friberg Ari T.
Published: January 2022

A method is proposed for spatial coherence measurement by means of temporal modulation of a double slit on a digital micromirror device. Some advantageous features including immunity to background light are shown theoretically and experimentally.
High-Q Floquet Defect Mode Resonance in a microring Floquet topological insulator
Authors: Afzal Shirin , Van Vien
Published: January 2022

We report a new defect-mode resonance phenomenon in a Floquet topological insulator by tuning the cyclic phase of a Floquet bulk mode. The resonance is cavity-less, tunable and can be formed anywhere in the bulk.
The Influence of Membrane Thickness on the Dynamic Response of Liquid Lens
Authors: Fu Jian , Yang Hui , Cao Ruimin , Wang Lihui
Published: January 2022

Liquid-filled variable focus lens is capable of dynamically changing its focal lengths. In this work, we investigated the thickness of the elastic membrane that affected the dynamic response of liquid lens.
Dynamical Charge Inversion of Polarization Correlation Vortex Propagating through a Cylindrical Lens
Authors: Pandit Himangi J. , Kumar Vijay , Singh R. P.
Published: January 2022

Polarization correlations are analyzed in propagating vector speckle field generated by scattering of Poincaré beam. Dynamical charge inversion of the correlation vortex is observed when the speckles propagate through a cylindrical lens.
Dynamic Speckle Metrology with Normalized Processing of Compressed Data
Authors: Stoykova Elena , Nazarova Dimana , Nedelchev Lian , Ivanov Branimir , Machikhin Alexander
Published: January 2022

Dynamic speckle metrology effectively detects areas of faster or slower changes on the surface of a 3D object. Monitoring of changes in time requires storage and processing of sequences of speckle images, and data compression becomes mandatory. The speckle images are often characterized with spatially varying speckle statistics, and this entails normalized processing. In the paper, we have studied by numerical simulation and demonstrated by the experiment feasibility of such type of processing in the case of compressed data.
Hosting an Exceptional Point in a Gain-Loss Assisted Dual- Core Optical Fiber Segment
Authors: Roy Arpan , Dey Sibnath , Laha Arnab , Biswas Abhijit , Ghosh Somnath
Published: January 2022

We report a dual-core gain-loss assisted optical fiber-segment to host an exceptional point between two quasi-guided hybrid-modes, and study the adiabatic mode conversion phenomenon by a stroboscopic gain-loss variation around the identified EP.
THz-TDS As a Diagnostic Tool for Monitoring the Water Content in Different Coloured Indian Almond Leaves
Authors: Menchu Nagaraju , Ghorui Chandan , Damarla Ganesh , Chaudhary Anil Kumar
Published: January 2022

We report the significant changes in terms of the refractive index and absorption coefficients of different colored almond leaves between 0.1-3.5 THz range and attributed to water and chlorophyll (peak at 0.34 THz) concentration.
Finite Element Analysis to Design an Ultra-stable Fabry-Pérot Cavity
Authors: Banerjee Sankalpa , Vaghasia Yutiben , Naik Darshay , Johnson Stanley , Haldar Sandip , De Shubhadeep
Published: January 2022

Instability of Fabry-Pérot cavity is investigated for different combinations of dimensions, materials, and support structures by using Finite Element Analysis. Salient results are presented and details will be expanded in the full paper.
Separating Ultrafast Ground and Excited State Vibrations
Authors: Dhamija Shaina , Bhutani Garima , De Arijit K.
Published: January 2022

Using „spectrally dispersed’ impulsive stimulated Raman spectroscopy, vibrational spectra arising from motion of nuclear wavepackets in ground and excited electronic states of iodine in carbon tetrachloride are recorded isolating from solvent modes.
Decoherence of Light Due to Non-Paraxial Propagation in an Inhomogeneous Medium
Authors: Petrov Nikolai I.
Published: January 2022

Nonparaxial evolution of partially-coherent beams in a graded-index medium is investigated. It is shown that the degree of spatial coherence of the beam decreases with distance due to the effect of nonparaxiality.
Monitoring Molecular Coherences at Conical Intersections via X-ray Raman Spectroscopy and Diffraction with Stochastic Free-Electron-Laser Pulses
Authors: Cavaletto Stefano M. , Keefer Daniel , Mukamel Shaul
Published: January 2022

Correlation techniques applied to x-ray Raman spectroscopy and diffraction with stochastic free-electron-laser pulses provide the temporal and spectral resolutions needed to monitor the evolution of molecular coherences at conical intersections.
Optical-Cavity Manipulation of Conical Intersections and Singlet Fission Dynamics
Authors: Gu Bing , Mukamel Shaul
Published: January 2022

We demonstrate how cavity polaritons can be employed to manipulate the photochemical processes of molecules. Specifically, the singlet fission process in pentacene dimers is shown to be strongly suppressed by strong light-matter coupling.
Selective Coupling of Dark and Bright Excitons in 2D Transition Metal Dichalcogenide Alloys to Planar Microstructures
Authors: Eswaramoorthy Lekshmi , Kumar Brijesh , Mokkapati Sudha , Kumar Anshuman
Published: January 2022

We present a route to selective coupling of dark and bright excitons in atomically thin transition metal dichalcogenide alloys to planar microstructures via anisotropic Purcell enhanced out-of-plane resonator modes engineered by tapering of micro-disks.
Selection rules by multi-scale dynamical symmetries & symmetries in synthetic dimensions
Authors: Ofer Neufeld , Lerner Gavriel , Tzur Matan Even , Cohen Oren
Published: January 2022

I will present (i) a theory describing the microscopic-macroscopic dynamical symmetries of electromagnetic fields, revealing new symmetries and selection rules in light- matter interactions, and (ii) selection rules in symmetry-broken systems by symmetries in synthetic dimensions.
Lightwave Control of Topological Properties in 2D Materials for Sub-Cycle and Non-Resonant Valley Manipulation
Authors: Jiménez-Galán Á. , Silva R.E.F. , Smirnova O. , Ivanov M.
Published: January 2022

Using light fields tailored on a sub-cycle timescale to the symmetry of graphene-like materials, we show selective minimization of the bandgap at one of the valleys, introducing a new method for valleytronics and light-induced topology.
Bright Single-Photon Emitting Diodes Based on the Silicon- Vacancy Center in AlN/Diamond Heterostructures
Authors: Khramtsov Igor A. , Fedyanin Dmitry Yu.
Published: January 2022

We propose and numerically demonstrate a concept of a single-photon emitting diode based on a color center in a nanoscale AlN/diamond heterojunction device, which gives the possibility to generate up to 4×107 photons per second at room temperature.
Tunable dielectric metasurfaces by structuring the phase-change material
Authors: Zhang Dong-Qin , Pan Gui-Ming , Jin Zhong-Wei , Shu Fang-Zhou , Jing Xu-Feng , Hong Zhi , Shen Chang-Yu
Published: January 2022

Metasurfaces have made great progress in the last decade for generating miniature and integrated optical devices. The optical properties of metasurfaces can be tuned dynamically by integrating with phase-change materials. However, the efficiency of tunable metasurfaces remains a bit low, which is a disadvantage for the realistic applications of metasurfaces. Here, we demonstrate the tunable dielectric metasurfaces by structuring the phase-change material Ge2Sb2Te5. The unit cell of metasurface is composed of several Ge2Sb2Te5 nanopillars with different geometric parameters, and the incident light interacts with different nanopillars at diverse phases of Ge2Sb2Te5, leading to various functions. By elaborately arranging the Ge2Sb2Te5 nanopillars, various tunable optical devices have been realized, including tunable beam steering, reconfigurable metalens and switchable wave plate. The refractive direction, focal length and polarization state can be tuned through the phase transition of Ge2Sb2Te5. The phase-change metasurfaces based on Ge2Sb2Te5 nanostructures could be used in cameras, optical microscopy and adaptive optics.
Cavity-dumped mode-locked Alexandrite laser oscillator with 100 mJ pulses stabilized by using a double trigger system
Authors: Moon Byunghyuck , An Young Jun , Kim Yong Soo , Lee Ju Han , Ju Byeong-Kwon , Jhon Young Min
Published: January 2022

We report a mode-locked Alexandrite single pulse laser with cavity dumping. Mode locking was achieved by using an AOM and an EOM was used for Q-switching and cavity dumping. The instability of the single pulse laser energy output was reduced down to a tenth of that of the conventional single trigger system by introducing a novel double trigger system. The single pulse laser energy and pulse width were 100 mJ and 475 ps in multiple mode and 12.5 mJ and 275 ps in single mode, obtained without a laser amplifier.
Analysis of effects of magnetic field gradient on atomic spin polarization and relaxation in optically pumped atomic magnetometers
Authors: Fang Xiujie , Wei Kai , Zhai Yueyang , Zhao Tian , Chen Xu , Zhou Mingti , Liu Ying , Ma Danyue , Xiao Zhisong
Published: January 2022

The magnetic field gradient within optical pumping magnetometers (OPMs) suppresses sensitivity improvement. We investigated the effects of the magnetic field gradient along the x-, y-, and z-axes on the limiting factors of magnetometers under extremely low magnetic field conditions. We modified the magnetic field gradient relaxation model such that it can be applied to atoms in the spin exchange relaxation free (SERF) regime. The gradient relaxation time and spin polarizations, combined with fast spin-exchange interaction, were determined simultaneously using the oscillating cosine magnetic field excitation and amplitude spectrum analysis method. During the experiments, we eliminated the errors caused by the temperature and pumping power, and considered different isotope spin exchange collisions in naturally abundant Rb during the data analysis to improve the fitting accuracy. The experimental results agreed well with those of theoretical calculations and confirmed the accuracy of the improved model. The contribution of the transverse magnetic field gradient to the relaxation of the magnetic field gradient cannot be ignored in the case of small static magnetic fields. Our study provides a theoretical and experimental basis for eliminating magnetic gradient relaxation in atomic sensors in the SERF region.
Arbitrary-order three-point finite difference method for the modal analysis of chiral waveguides
Authors: Cao Yusheng
Published: January 2022

A three-point finite difference method with an arbitrary order of accuracy is proposed for the modal analysis of chiral planar waveguides. The elaborate application of a nonuniform grid, compact finite difference technique, and boundary conditions results in an efficient, easily implemented, and versatile tool for the modal analysis of chiral planar waveguides with an arbitrarily discontinuous profile of permittivity, permeability, and chirality. In particular, this method efficiently resolves the fine structures in plasmon and photonic crystal waveguides. For the test model of a chiral-metallic plasmon waveguide, stable convergence up to a sixteenth order of accuracy can be obtained, which produces a relative error on the effective index that approaches the machine precision with only eighty grid points.
Engineering pupil function for optical adversarial attacks
Authors: Kim Kyulim , Kim JeongSoo , Song Seungri , Choi Jun-Ho , Joo Chulmin , Lee Jong-Seok
Published: January 2022

Adversarial attacks inject imperceptible noise to images to deteriorate the performance of deep image classification models. However, most of the existing studies consider attacks in the digital (pixel) domain where an image acquired by an image sensor with sampling and quantization is recorded. This paper, for the first time, introduces a scheme for optical adversarial attack, which physically alters the light field information arriving at the image sensor so that the classification model yields misclassification. We modulate the phase of the light in the Fourier domain using a spatial light modulator placed in the photographic system. The operative parameters of the modulator for adversarial attack are obtained by gradient-based optimization to maximize cross-entropy and minimize distortion. Experiments based on both simulation and a real optical system demonstrate the feasibility of the proposed optical attack. We show that our attack can conceal perturbations in the image more effectively than the existing pixel-domain attack. It is also verified that the proposed attack is completely different from common optical aberrations such as spherical aberration, defocus, and astigmatism in terms of both perturbation patterns and classification results.
Off-axis aberration correction for a reflective coded aperture snapshot spectral imager
Authors: Zhao Xianhong , Ma Xu
Published: January 2022

The reflective optical configuration of the coded aperture snapshot spectral imager (CASSI) based on a digital micromirror device (DMD) features both high quality and high flexibility of intensity modulation, but the image quality is always subject to off-axis aberration. This letter analyzes the formation of the off-axis aberration, and then proposes an optical-axis-shift (OAS) configuration to compensate for this adverse effect in the DMD-based reflective CASSI system. Experimental results demonstrate that the proposed design can effectively eliminate the off-axis aberration. The average peak signal-to-noise ratio of the reconstructed spectral images is improved by approximately 2.8 dB. In addition, other methods to alleviate the off-axis aberration are discussed, and the superiority of the proposed design is signified. The proposed OAS design is easy to implement with commercially available components, and provides an initial configuration of an optical design to implement a high-performance CASSI instrument.
Surveillance of few-mode fiber-communication channels with a single hidden layer neural network
Authors: Pohle Dennis , Rothe Stefan , Koukourakis Nektarios , Czarske Jürgen
Published: January 2022

Multi- and few-mode fibers (FMFs) promise to enhance the capacity of optical communication networks by orders of magnitude. The key for this evolution was the strong advancement of computational approaches that allowed inherent complex light transmission to be surpassed, learned, or controlled, reined in by modal crosstalk and mode-dependent losses. However, complex light transmission through FMFs can be learned by a single hidden layer neural network (NN). The emerging developments in NNs additionally allow the implementation of novel concepts for security enhancements in optical communication. Once the transmission characteristics of FMFs are learned, it is possible to survey the incoming and outgoing light fields via monitoring channels during data transmission. If an eavesdropper tries to gain unauthorized access to the FMF, its transmission properties are impaired through sensitive modal crosstalk. This process is registered by the NN and thus the eavesdropper is revealed. With our solution, the security of optical communication can be improved.
1.53 W all-solid-state nanosecond pulsed mid-infrared laser at 6.45 µm
Authors: Lv Ze , Shen Yu , Zong Nan , Bian Qi , Wang Er-Peng , Chang Jin-Quan , Bo Yong , Cui Da-Fu , Peng Qin-Jun
Published: January 2022

A compact and robust all-solid-state mid-infrared (MIR) laser at 6.45 µm with high average output power and near-Gaussian beam quality is demonstrated. A maximum output power of 1.53 W with a pulse width of approximately 42 ns at 10 kHz is achieved using a ZnGeP2 (ZGP) optical parametric oscillator (OPO). This is the highest average power at 6.45 µm of any all-solid-state laser to the best of our knowledge. The average beam quality factor is measured to be M2 = 1.19. Moreover, high output power stability is confirmed, with a power fluctuation of less than 1.35% rms over 2 h, and the laser can run efficiently for more than 500 h in total. Using this 6.45 µm pulse as a radiation source, ablation of animal brain tissue is tested. Furthermore, the collateral damage effect is theoretically analyzed for the first time, to the best of our knowledge, and the results indicate that this MIR laser has excellent ablation ability, making it a potential replacement for free electron lasers.