bluuebunny/crossref_metadata_2025 huggingface dataset:
Case Report: Acute lower limb ischemia in a recovered COVID-19 patient
Authors: Essa Rawand Abdulrahman , Ahmed Sirwan Khalid
Published: October 2020

Arterial thrombosis is rarely reported in relation to COVID-19 patients. It occurs mostly in critical patients especially those with acute respiratory distress syndrome and patients in intensive care units. The cause of arterial thrombosis is mostly related to a cytokine storm.  However, limited studies are available regarding arterial thrombosis in COVID-19 disease. Here, we present a case of lower limb ischemia in a moderately symptomatic COVID-19 patient in Iraq within three days after recovery from COVID-19. The patient presented with  severe right lower limb pain, forefoot, cyanosed toes, and lower limb ischemia was diagnosed by physical examination and ultrasound. The patient was successfully treated by anticoagulant drugs. Our case alerts healthcare workers that they need to be more cautious of life threatening COVID-19 complications in order to begin early and effective preventive measures.
Atlas de Histología. Microscopía óptica y electrónica
Authors: Martín Lacave Inés , Utrilla Alcolea José Carmelo , Fernández Santos José María , García-Caballero Parada Tomás
Published: October 2020

El Atlas de Histología. Microscopía óptica y electrónica constituye una verdadera "guía visual" de la estructura microscópica del cuerpo humano, imprescindible como complemento a los textos de Histología e insustituible para la comprensión de las clases prácticas con el microscopio. El Atlas está especialmente dirigido a los estudiantes de Medicina y Biomedicina, aunque también puede ser muy útil en los Grados de Odontología, Biología, Podología y Veterinaria, así como una referencia para los investigadores y especialistas en Ciencias de la Salud. Características: - Tiene un formato muy didáctico e innovador consistente en el diseño de 365 Láminas histológicas rotuladas, que se han elaborado con microfotografías en color realizadas a aumentos progresivos de los distintos tejidos, órganos, aparatos y sistemas. - Consta de 28 capítulos, estando el primero de ellos dedicado a las "Técnicas de tinción y tipos de microscopía" que se emplean en el libro: técnicas histológicas clásicas para microscopía óptica (M.O.), inmunohistoquímica (IHQ), microscopía electrónica de transmisión (M.E.T.) y microscopía de barrido (M.E.B.). El segundo capítulo analiza "La célula": cómo se organizan las células, diversas formas y tamaños celulares, así como su ultraestructura. Los doce capítulos siguientes abordan los cuatro tejidos básicos: epitelial, conjuntivo, muscular y nervioso, y sus variedades. Los restantes catorce capítulos analizan los distintos órganos, aparatos y sistemas mediante M.O., IHQ, M.E.B. y M.E.T. - Está diseñado para que durante las sesiones prácticas los alumnos dispongan de una Lámina histológica por cada preparación, por lo que reduce al mínimo las posibilidades de desorientación habituales durante la observación con el microscopio. - Incluye cerca de 1700 microfotografías de alta calidad, donde se analiza pormenorizadamente mediante microscopía cómo es nuestro cuerpo en estado de salud, sentando así las bases para comprender los cambios que sufre en las distintas enfermedades. - La compra de este libro incluye el acceso a un sitio web con todas las imágenes contenidas en la obra, y utilizando el código QR impreso), una excelente herramienta para los profesores que impartan la asignatura de Histología, así como para los estudiantes que quieran observar las microfotografías a mayores aumentos. - En resumen, se trata de una obra enormemente didáctica, que describe la histología de forma amena a la vez que exhaustiva y que debe estar siempre al alcance de los estudiosos de esta materia.
Signal quality index: an algorithm for quantitative assessment of functional near infrared spectroscopy signal quality
Authors: Sappia M. Sofía , Hakimi Naser , Colier Willy N. J. M. , Horschig Jörn M.
Published: October 2020

We propose the signal quality index (SQI) algorithm as a novel tool for quantitatively assessing the functional near infrared spectroscopy (fNIRS) signal quality in a numeric scale from 1 (very low quality) to 5 (very high quality). The algorithm comprises two preprocessing steps followed by three consecutive rating stages. The results on a dataset annotated by independent fNIRS experts showed SQI performed significantly better (p<0.05) than PHOEBE (placing headgear optodes efficiently before experimentation) and SCI (scalp coupling index), two existing algorithms, in both quantitatively rating and binary classifying the fNIRS signal quality. Employment of the proposed algorithm to estimate the signal quality before processing the fNIRS signals increases certainty in the interpretations.
High-Speed Multi-User Underwater Wireless Optical Communication System Based on NOMA Scheme
Authors: Zhang Li , Wang Zhaoming , Wei Zixian , Dong Yuhan , Fu H.Y. , Cheng Julian
Published: October 2020

We for the first time proposed and experimentally demonstrated a two-user NOMA UWOC system with 2-m link distance. A 4.686 Gbps sum-rate was achieved for two users with 8.69X10-4 and I.73xl0-3 bit-error-rates.
The modulated phase controlled THz radiation from silicon nanosandwiches
Authors: Golovin P.A. , Rul N.I. , Klyachkin L.E. , Malyarenko A.M. , Bagraev N.T.
Published: October 2020

The phase controlled longitudinal conductance and the modulated phase shift of the THz electroluminescence spectrum are observed by varying the voltage applied to the external gates of the silicon nanosandwiches within the quantum Faraday effect.
All-fiber thulium-doped fiber laser (TDFL) for volumetric photoacoustic microscopy of lipids
Authors: Shi Jiawei , Li Can , Mao Huade , Wong Kenneth K. Y.
Published: October 2020

We demonstrate a high-energy gain-switched TDFL for volumetric PA microscopy of lipids at 1700, 1725, and 1750 nm. Pulse energies are 58.2, 66.8, and 75.3 μJ, respectively, with a 16.7 ns duration at 10 kHz. © 2020 The Author(s)
Broadband thulium-assisted optical parametric chirped-pulse amplifier (TAOPCPA) for spectrally encoded microscopy at 2 μm
Authors: Shi Jiawei , Cui Xiaomeng , Wong Kenneth K. Y.
Published: October 2020

We report a broadband thulium-assisted optical parametric amplifier at 2m with a 10dB bandwidth 427.77nm. It is a promising laser source for the application of spectrally encoded microscopy. © 2020 The Author(s)
Rapid Measurement of Spatial Distribution of Birefringence in Optical Fibers by Coherent Heterodyne Detection of Rayleigh Backscattered Light
Authors: Takei Nanako , Ryu Shiro
Published: October 2020

The spatial distribution of the fiber birefringence has been measured by measuring the optical phase of Rayleigh backscattered light with coherent heterodyne detection. We could measure the birefringence distribution just in one millisecond. © 2020 The Author(s)
Ultrafast laser-pulse processing of muscovite – contrasting response at 515 nm and 800 nm
Authors: Awasthi Saurabh , Little Douglas J. , Fuerbach Alex , Kane Deb M.
Published: October 2020

Muscovite, a dielectric, shows a qualitatively different response to irradiation with a single ~150fs laser pulse at 515 nm as compared to 800 nm. Pulse fluences up to 7J/cm2 are studied. © 2020 The Author(s)
Enhanced four-wave mixing in micro-ring resonators with integrated 2D layered graphene oxide films
Authors: Wu Jiayang , Yang Yunyi , Zhang Yuning , Qu Yang , Jia Linnan , Xu Xingyuan , Chu Sai T. , Little Brent E. , Morandotti Roberto , Jia Baohua , Moss David J.
Published: October 2020

Two-dimensional layered graphene oxide films are integrated with micro-ring resonators to experimentally demonstrate enhanced four-wave mixing, achieving up to ~7.6-dB enhancement in conversion efficiency for a uniformly coated device and ~10.3-dB for a patterned device.
MHz-resolution Electro-optic Dual-comb Spectroscopy with 360 GHz Bandwidth by using Injection Locking Technique
Authors: Xu Bingxin , Fan Xinyu , He Zuyuan
Published: October 2020

We propose a novel dual-comb spectroscopy technique with 1-MHz resolution using ultra-dense electro-optic comb, and the bandwidth is broadened 20 times to 360 GHz by using injection locking technique.
A Effective Carrier Phase Recovery Method in Tight Time-Packing Fast than Nyquist Optical Communication System
Authors: Sun Peng , Zhang Xiaoguang , Pan Dongwei , Xi Lixia , Zhang Wenbo , Tang Xianfeng
Published: October 2020

We propose a new scheme that combines polybinary transformation and corrected-BPS to compensate phase noise for PDM-FTN-QPSK when its accelerated factor is 0.5, which has 3.3 dB OSNR gain when phase noise is 800 kHz.
High-order-mode-suppressed multimode microresonators with a low-loss mode remover
Authors: Zhang Yu , Wan Yuhang , Ma Xinxuan , Xu Di , Zheng Zheng
Published: October 2020

A high-order mode suppressed multimode microresonator is experimentally demonstrated, where a curved waveguide coupler couples out the high-order mode in the multimode ring waveguide and leaves the fundamental mode undisturbed, as a low-loss mode filter.
Experimental evaluation of numerical modelling of a first-order Bessel-Gaussian optical funnel
Authors: Lavin-Varela Sebastian , Ploschner Martin , Awel Salah , Kirian Richard A. , Horke Daniel A. , Küpper Jochen , Chapman H. N. , Rode A. V.
Published: October 2020

We present a comparison between a numerical model and the experimental results on the generation of a first-order Bessel-Gaussian optical funnel for guiding of airborne microparticles.
Beam Control and Tracking Techniques for Free-Space Optical Communications
Authors: Mai Vuong V. , Kim Hoon
Published: October 2020

We review the recent research activities on beam control and tracking techniques for mitigating deleterious effects of angle-of-arrival fluctuation and pointing error on the performance of free-space optical communications.
Millimeter-Long Optical Antenna for Optical Phased Array
Authors: Chen Jiaxin , Li Wanxin , Tian Jiajun , Sun Yunxu , Yao Yong , Xu Xiaochuan
Published: October 2020

We propose to place subwavelength segments in the evanescent field region of strip waveguide to reduce grating strength. Millimeter-long grating is designed which is essential to the implementation of large aperture optical phased arrays.
The eye-safe vector lasers with selective polarization outputs
Authors: Fu Shiyao , Song Rui , Zhou Heng , Gao Chunqing
Published: October 2020

A 1.6 μm eye-safe resonantly pumped Er:YAG vector laser is demonstrated both theoretically and experimentally. Moreover, by adjusting or rotating the elements inside the resonator, various states on a single high-order Poincare sphere can be generated.
Heterogeneously integrated on-chip nanolasers
Authors: Fainman Y. , Pan S. H. , Deka S. , Jiang S. , Amili A. El
Published: October 2020

We discuss nanoscale metal-dielectric-semiconductor resonant gain geometries to create a new type of light emitters focusing on three key aspects: second order intensity correlation characterizations, direct modulation and electromagnetic isolation in a nanolaser system.
Self-generated chaos in a free-running Fabry-Perot quantum dot laser
Authors: Zhou Yue-Guang , Zhu Si , Lau Kei May , Wang Cheng
Published: October 2020

This work demonstrates that a free-running Fabry-Perot quantum dot laser generates chaotic oscillations without any external perturbations, which is owing to the multimode Risken-Nummerdal-Graham-Haken instability.
Co-located sensing and imaging via a single fibre [Invited]
Authors: Li Jiawen
Published: October 2020

Two types of single-fibre-based multimodal probes will be discussed. One can perform co-located imaging and sensing deep inside the body. The other one comprises 3D- printed freeform micro-optics, and detects microstructural and molecular information simultaneously.
A Robust Multi-channel Smartphone Spectrometer Utilizing Multiple Diffraction Orders
Authors: Biswas Protik Chandra , Hossain Md Arafat , Rani Saptami , Islam Md Rafiqul , Canning John
Published: October 2020

A robust multi-channel smartphone spectrometer is reported by utilizing the multiple diffraction orders of an ordinary diffraction grating.
Membrane Metasurfaces
Authors: Yang Quanlong , Kruk Sergey , Xu Yuehong , Wang Qingwei , Srivastava Yogesh Kumar , Koshelev Kirill , Kravchenko Ivan , Singh Ranjan , Han Jiaguang , Kivshar Yuri , Shadrivov Ilya
Published: October 2020

We introduce Mie-resonant dielectric membrane metasurfaces for THz frequencies. We design silicon membrane metasurfaces with the 2π phase coverage and high transmission efficiencies to provide novel opportunities for an efficient wavefront control and multifunctional operations.
Mode (De)multiplexer Without Mode Conversion Based on Three-Core Waveguide Directional Coupler
Authors: Jiang Wenfan , Chiang Kin Seng
Published: October 2020

We propose a mode (de)multiplexer without mode conversion based on a symmetric three-core waveguide directional coupler formed with a single-mode core placed between two identical few-mode cores. This mode (de)multiplexer can offer ultra-low modal crosstalk. © 2020 The Author(s)
Spontaneous polarization symmetry breaking of temporal cavity solitons in optical Kerr resonators
Authors: Xu Gang , Nielsen Alexander U. , Garbin Bruno , Fatome Julien , Hill Lewis , Oppo Gian-Luca , Murdoch Stuart G. , Erkintalo Miro , Coen Stephane
Published: October 2020

We report novel types of polarized symmetry-broken temporal cavity solitons in passive driven nonlinear resonators. We demonstrate experimentally individual addressing of these solitons, and simultaneous co-existence of cavity solitons with mirror polarization states.
Effect of Edge Angle of Ink-Jet Printed Microdisk Lasers on Mode Shift Due to Protein Adsorption
Authors: Nasir Abdul , Mikami Yuya , Takagishi Taku , Yatabe Rui , Yoshioka Hiroaki , Vasa Nilesh , Oki Yuji
Published: October 2020

Hyper branched polymer FC-V-50 based microdisk lasers with different edge angles were fabricated by ink-jet printing method. Then, effect of edge angle on mode shift was investigated by monitoring the physical adsorption of BSA protein.
Cascaded Neural Network with Anomaly Detection for Optical Performance Monitoring
Authors: Li Yuanjian , Zhang Jing , Hu Shaohua , Zhang Wanting , Yi Xingwen , Yu Zhenming , Xu Bo , Qiu Kun
Published: October 2020

We propose a novel cascaded neural network with abnormality monitoring to simultaneously identify the modulation format and monitor the OSNR. The experimental results show 97.5 % MFI accuracy and 0.167dB average MAE for OSNR monitoring.
Ultra-Broadband Silicon Dual-Core Photonic Crystal Fiber Polarization Beam Splitter at Mid-Infrared Spectral Region Based on Surface Plasmon Resonance
Authors: Qu Yuwei , Yuan Jinhui , Qiu Shi , Zhou Xian , Wang Haiyun , Yan Binbin , Wang Kuiru , Sang Xinzhu , Long Keping , Yu Chongxiu
Published: October 2020

An ultra-broadband silicon dual-core photonic crystal fiber polarization beam splitter at mid-infrared spectral region based on surface plasmon resonance is proposed. The bandwidths of the cores A and B are 730 and 580 nm, respectively. © 2020 The Author(s).
High extinction on-chip long pass filters in LNOI towards quantum optical applications
Authors: Boes Andreas , Nguyen Thach , Chang Lin , Bowers John E. , Mitchell Arnan
Published: October 2020

We present a design for compact and efficient spectral filters with an extinction ratio of ~190 dB/cm in lithium niobate on insulator, which are essential for the on-chip integration of quantum-correlated photon pair sources.
Supercontinuum generation in a high index doped silica glass slot waveguide
Authors: Li Guangkuo , Li Yuhua , Ho Victor W. L. , Li Qian , Wang Shao Hao , Davidson Roy , Little Brent E. , Chu Sai T.
Published: October 2020

We demonstrate over one octave spanning of supercontinuum (SC) generation at 1550 nm in a 2.7 cm long high-index doped glass waveguide with a thin SiO2 slot across the middle of core.
VCSEL-Based Multi-user Optical Wireless Communication System Using Non-Orthogonal Multiple Access
Authors: Zhang Li , Wei Zixian , Chen Yingjie , Wang Zhaoming , Pepe Alberto , Liu Xin , Fu H. Y. , Dong Yuhan
Published: October 2020

A near-infrared VCSEL-based QAM-OFDM NOMA OWC system with 1.13-GHz bandwidth is for the first time demonstrated to transmit two signals simultaneously of 1.6-Gbps data rate over 2-m distance. Different power allocation strategies are further evaluated.
Low-rank Reconstruction for Multimode Fiber Imaging
Authors: Hao Min , Yang Dongyue , Luo Bin , Yin Longfei , Wu Guohua
Published: October 2020

We present a novel scheme of multimode fiber imaging based on low-rank constraint. Compared with the sparse constraint, low-rank reconstruction will achieve higher image quality and smoothness, especially in under-sampling cases.
Fiber Optical Parametric Oscillator with Flexible Repetition Rate for Coherent Anti-Stokes Raman Imaging
Authors: Yang Kangwen , Wang Qingting , Zheng Shikai , Hao Qiang , Huang Kun , Zeng Heping
Published: October 2020

A fiber optical parametric oscillator with tunable repetition rate from 1.15 to 4.60 MHz was demonstrated by rational harmonic pumping, which offers a convenient method to excite different biomedical samples with minimum photodamage.
Lithium Niobate and Other Quadratic Materials for Nanophotonic Devices
Authors: Grange Rachel
Published: October 2020

I will present innovative bottom-up and top-down fabrication of metal-oxides that are different from semiconductors. I will show strategies to control optical signals by engineering metal-oxides and applications such as an integrated broadband spectrometer.
Thin Film Lithium Niobate Electro-optic Modulator Based on a Slow Wave Structure
Authors: Liu Xuecheng , Xiong Bing , Sun Changzheng , Hao Zhibiao , Wang Lai , Wang Jian , Han Yanjun , Li Hongtao , Yu Jiadong , Luo Yi
Published: October 2020

We propose a thin film lithium niobate modulator based on photonic crystal waveguide and slow wave electrodes. Simulations predict a low half-wave voltage of 2 V as well as an ultrawide-bandwidth over 200 GHz.
Distributed vibration detection and location using phase-sensitive optical frequency domain reflectometry
Authors: Deng Yuanpeng , Liu Qingwen , Li He , He Zuyuan
Published: October 2020

The vibration near optical fiber is detected using phase-sensitive optical frequency domain reflectometry, and then time difference of arrival method is adopted to locate the position of vibration source in field experiments.
Phase Extraction of the Rayleigh Backscattering Signal in φ-OTDR System based on SSB Signal
Authors: Wu Qin , Wang Kun , Sun Jinxiang , Chen Shuo , Liu Fei , Zhang Zhiguo , Huo Jiahao , Long Keping , Zhou Xian
Published: October 2020

A novel φ-OTDR system based on single-sideband signal in digital domain is proposed to demodulate the amplitude and phase of the Rayleigh backscattering signal directly with a signal to noise ratio of 41.1 dB.
Optical Force on Asymmetric Au@SiO2 Core-Shell Particle
Authors: Sun Qiang , Dholakia Kishan , Greentree Andrew D.
Published: October 2020

Optomechanical response on asymmetric Au@SiO2 core-shell particles under Gaussian illumination with linear polarisation is studied using the field-only surface-integral method. We find departures from the centrosymmetric case that are significant for optical force and torque.
High-resolution polymer waveguide devices fabricated using three-dimensional multiphoton lithography
Authors: Gao Hongwei , Chen George F. R. , Low Hong Yee , Tan Dawn T.H.
Published: October 2020

Three-dimensional polymer waveguide devices are fabricated using 3D-multiphoton lithography, including photonic waveguides, Bragg gratings and ring resonators with sub-micron gap sizes. Error-free transmission of 30Gb/s non-return-to-zero data and 56Gb/s pulse amplitude modulation-4 data is demonstrated.
Single Particle Detection Leveraging Mode Splitting in Subwavelength Grating Metamaterial Ring Resonator
Authors: Li Wanxin , Chen Jiaxin , Tian Jiajun , Sun Yunxu , Yao Yong , Xu Xiaochuan
Published: October 2020

In this paper, we investigated the mode splitting in subwavelength grating metamaterial ring resonators caused by the break of rotational symmetry, which can be leveraged to detect 25 nm diameter single nano particle.
Next-Generation High-speed Access Network for Emerging Services
Authors: Zhang Junwen , Xu Mu , Zhang Haipeng , Jia Zhensheng , Campos Luis Alberto
Published: October 2020

To keep up with increased bandwidth demand and support emerging services, this invited paper reviews challenges, solutions and network options for next generation access networks at the capacity over 50 Gb/s and even beyond.
A 2×320 Gbps Hybrid PDM-MDM-OFDM System for High-Speed Terrestrial FSO Communication
Authors: Kakati Dhiman , Sonkar Ramesh Kumar
Published: October 2020

A single-channel dual-polarization-16-QAM-OFDM-MDM system has been proposed to achieve a data rate of 2×320 Gbps over 2.2 km free-space optics link with a receiver sensitivity of -11.8 dBm and OSNR requirement of 44 dB.
Robust and linewidth tolerant two-stage carrier recovery scheme for probabilistically shaped QAM system
Authors: Lin Zhiying , Xiang Qian , Yang Yanfu , Yao Yong
Published: October 2020

A novel two-stage carrier recovery scheme for probabilistically shaped QAM modulation formats is proposed. Compared with the blind phase search, the proposed scheme shows robust and better linewidth tolerance, especially under strong probabilistic shaping condition.
Octave-spanning Coherent OAM Supercontinuum Generation Using As2S3 PCF with All-normal Dispersion
Authors: Geng Wenpu , Bao Changjing , Fang Yuxi , Wang Yingning , Li Yiqiao , Wang Zhi , Liu Yange , Huang Hao , Ren Yongxiong , Pan Zhongqi , Yue Yang
Published: October 2020

We design an all-normal dispersion As2S3 photonic crystal fiber to enable a flat and coherent OAM supercontinuum. A 1946-nm supercontinuum forms from 959 to 2905 nm at -20 dB level, which covers a 1.6-octave bandwidth.
Analysis Tools to Uncover Variations in Picosecond Mode-Locked Pulses
Authors: Malica Tushar , Lin Jipeng , Ackemann Thorsten , Little Douglas J. , Toomey Joshua P. , Lubeigt Walter , Hempler Nils , Kane Deb M.
Published: October 2020

A big data approach is demonstrated for quality assurance of mode-locked pulses longer than ~20 ps. Real-time recordings of pulses sampled at 200 Gs/s are analysed to quantify pulse consistency within sequences of ~50,000 pulses.
Optoacoustic Manipulation of Quasi-Continuous-Wave Background in Mode-Locked Fiber Laser
Authors: Lee Ki Sang , Ha Chang Kyun , Moon Kyoung Jun , Han Dae Seok , Kang Myeong Soo
Published: October 2020

We demonstrate the manipulation of quasi-continuous-wave background in a mode-locked fiber laser using optoacoustically excited acoustic impulses. The properties of the resulting intensity modulations of the background can be tailored by changing the fiber parameters.
Digitally Enhanced Homodyne Dispersion Spectrometer
Authors: Wong Justin , Bandutunga Chathura P. , Zhang Ya , Gray Malcolm B. , Chow Jong H.
Published: October 2020

We present a fiber dispersion spectrometer using a digitally enhanced homodyne phase readout that minimizes optical complexity. We demonstrate a phase sensitivity of 10 microradian, yielding a fractional absorption sensitivity for the spectrometer of 1x10-4. © 2020 The Author(s)
Flicker-free Multi-channel Transmitter Orientation in Camera based Optical Wireless Communications
Authors: Teli Shivani Rajendra , Zvanovec Stanislav , Ghassemlooy Zabih
Published: October 2020

We demonstrate the camera based optical wireless communications using flicker-free multi-channel transmitter orientation that provide 100 % success of reception over orientation angle of up to 30˚ at 200 and 400 µs camera shutter speed.
Multi-User OFDMA Optical Wireless Communication System Based on Near-Infrared VCSEL
Authors: Zhang Li , Wei Zixian , Chen Yingjie , Zhang Kai , Cheng Julian , Dong Yuhan , Fu H.Y.
Published: October 2020

A VCSEL based OFDMA optical wireless optical system with 1.13 GHz bandwidth is experimentally demonstrated to achieve 2.7 Gbps data rate under 0 and 3.2×10-3 bit-error-rates respectively for two users with distinct channel conditions.
Continuous Wave Resonantly Pumped Second Stokes Diamond Raman Laser
Authors: Li Muye , Kitzler Ondrej , Spence David
Published: October 2020

We explore a ring cavity continuous-wave diamond Raman laser with a tunable second Stokes output. We will characterize the laser operation at first and second Stokes and discuss the conditions of single longitudinal mode operation.
Observation of Extraordinary SHG from WS2 Monolayers Boosted by Optical Bound States in the Continuum
Authors: Bernhardt Nils , Koshelev Kirill , White Simon , Meng Kelvin Wong Choon , Fröch Johannes E. , Kim Sejeong , Tran Trong Toan , Choi Duk-Yong , Kivshar Yuri , Solntsev Alexander S.
Published: October 2020

Integrating WS2 monolayers with resonant silicon metasurfaces hosting optical bound states in the continuum, we observe a strong increase of the second-harmonic intensity by a factor exceeding 1100.
Arbitrary Transformation of Two-Photon Polarization-Entangled States with Metasurfaces
Authors: Lung Shaun , Wang Kai , Kamali Khosro Zangeneh , Rahmani Mohsen , Neshev Dragomir N. , Sukhorukov Andrey A.
Published: October 2020

We reveal that specially designed all-dielectric metasurfaces can transform any input two-photon polarization-entangled state to an arbitrary target state, achieving a tailored control over the degree of entanglement through a theoretically optimal non-Hermitian operation.
GLINT : Imaging exoplanets using integrated-photonics
Authors: Martinod M.A. , Norris B. , Gross S. , Arriola A. , Gretzinger T. , Withford M. , Lagadec T. , Tuthill P.
Published: October 2020

Imaging exoplanets requires high angular resolution and high contrast capability. Nulling interferometry with integrated-photonics technology can address these challenges. This paper presents GLINT, a nulling interferometer based on photonic technologies and its first on-sky results.
All-fiber Mode-locking By Employing Bend-induced Polarization Dependent Loss In Low-V-number Fiber
Authors: Huang Yunpeng , Jiang Hongbo , Zhao Zihao , Jin Lei , Set Sze Y. , Yamashita Shinji
Published: October 2020

We propose and demonstrate, for the first time, a stable all-fiber thulium-doped mode-locked laser using a low-V-number fiber to generate sufficient amount of polarization dependent loss for nonlinear polarization rotation. © 2020 The Author(s)
Widely Tunable Ultra-Narrow-Linewidth Nearly Transform-Limited Dissipative Soliton Generation at Telecom Band
Authors: Ha Chang Kyun , Lee Ki Sang , Kang Myeong Soo
Published: October 2020

We successfully demonstrate a widely all-parameter-tunable ultra-narrow-linewidth nearly transform-limited mode-locked erbium-doped fiber laser. Pulse-width-adjustable (100–150 ps) low-repetition-rate (~2 MHz) dissipative solitons are generated over the pulse-breakup-free wavelength tuning range of 34.3 nm (1529.3–1563.6 nm). © 2020 The Author(s)
Cross-phase Modulational Instability of Vortex Modes in a Twisted Three-Core Photonic Crystal Fibre
Authors: Wong Gordon K. L. , Roth Paul , Frosz Michael H. , Russell Philip St.J.
Published: October 2020

We report the first experimental demonstration of cross-phase modulational instability of circularly polarized vortex modes in a twisted PCF with a threefold symmetric core. The polarization and topological charge of the generated sidebands are measured. © 2020 The Author(s)
Enhanced Nonlinear Phase-Shift in Epsilon-Near-Zero Materials: The effect of Group and Phase Velocity
Authors: Benis Sepehr , Munera Natalia , Van Stryland Eric W. , Hagan David J.
Published: October 2020

We present Beam-Deflection experiments, to measure the temporal and spectral dependence of the nonlinear phase-shift of ITO at ENZ. Our measurements suggest that group and phase velocity contribute to the enhanced nonlinearities observed at ENZ. © 2020 The Author(s)
Superfluid Acoustics in a Dumbbell Helmholtz Oscillator
Authors: Gauthier Guillaume , Szigeti Stuart S. , Reeves Matthew T. , Baker Mark , Bell Thomas A. , Rubinsztein-Dunlop Halina , Davis Matthew J. , Neely Tyler W.
Published: October 2020

We show that an acoustic circuit model quantitatively predicts superfluid transport through a channel. With large initial excitation, we show that typical phase-slip model of the dissipation must be extended to include turbulence. © 2020 The Author(s)
Limitation of the thermally induced wavefront degradation in high average power ultrashort laser.
Authors: Clady Raphaël , Charmasson Laurent , Utéza Olivier , Sentis Marc
Published: October 2020

We study the thermally induced aberrations in the compressor of a high average power ultrashort laser. We demonstrate a significant reduction of these distortions by selecting a substrate of diffraction gratings with adequate thermomechanical properties.
Upconversion detection of 1.25 Gb/s Mid-IR telecommunications using a silicon avalanche photodiode
Authors: Gray Alan C. , Berry Sam A. , Carpenter Lewis G. , Gates James C. , Gawith Corin B. E. , Smith Peter G. R.
Published: October 2020

We present our current work investigating telecommunication transmission in the mid-infrared region and detection in the silicon absorption band. We achieve 10-7 bit error rates using commercial lasers in single-pass nonlinear conversion stages using MgO:PPLN.
Terahertz Integrated Photonic Chip based on Metal/Dielectric Hybrid Waveguide
Authors: Li Haisu , Low Mei Xian , Ako Rajour Tanyi , Bhaskaran Madhu , Sriram Sharath , Withayachumnankul Withawat , Kuhlmey Boris T. , Atakaramians Shaghik
Published: October 2020

We present an experimental demonstration of hybrid terahertz waveguide chips for terahertz integration, which support a single-mode, low-loss and low-dispersion bandwidth over 0.367-0.411 THz. Waveguide bends can also be integrated inside the chip.
Single rare-earth ion spins in nanophotonic resonators
Authors: Kindem Jonathan M. , Ruskuc Andrei , Bartholomew John G. , Rochman Jake , Huan Yan Qi , Faraon Andrei
Published: October 2020

Rare-earth ions embedded in crystals are promising optically addressable spin qubits. We demonstrate this potential by measuring the optical and spin transition properties of single 171Yb3+ ions coupled to nanophotonic resonators fabricated in YVO4.
Super-resolution light-sheet add-on microscopy (SLAM) enabling isotropic high-resolution 3D imaging on conventional epifluorescence microscope
Authors: Zhao Fang , Zhu Lanxin , Fang Chunyu , Fei Peng
Published: October 2020

We have developed a method that combines deep-learning super-resolution computation with a compact light-sheet add-on device, to readily enable high-speed imaging on an inverted microscope at isotropic 1-μm resolution across a large field of view.
A Parity-Time-Symmetric Optoelectronic Oscillator Based on Non-Reciprocal Electro-Optic Modulation
Authors: Fan Jinying , Li Lingzhi , Zhang Jiejun , Feng Xinhuan , Guan Bai-Ou , Yao Jianping
Published: October 2020

We propose and experimentally demonstrate a parity-time- (PT-) symmetric optoelectronic oscillator (OEO) implemented based on non-reciprocal electro-optic modulation in a Mach-Zehnder modulator for the generation of a microwave signal with a low phase noise.
EDFA-band Coverage Broadband SBS Filter for Optical Carrier Recovery
Authors: Zarifi Atiyeh , Merklein Moritz , Liu Yang , Choudhary Amol , Eggleton Benjamin J. , Corcoran Bill
Published: October 2020

We demonstrate SBS-based optical carrier recovery scheme with full EDFA-band coverage and 20 dB of gain. This approach shows nearly an order of magnitude improvement in the operation range of the conventional SBS filter.
Ultra-sharp Fano resonances in integrated photonic resonators based on coupled Sagnac loop reflectors
Authors: Arianfard Hamed , Wu Jiayang , Moss David j.
Published: October 2020

We investigate Fano resonances in integrated photonic resonators formed by coupled Sagnac loop reflectors (CSLR). Mode splitting in the CSLR resonator is tailored to achieve multiple Fano-like resonances with ultrahigh extinction ratios and slope rates.
High-efficiency broadband grating coupler in SiN/a-Si/SiN sandwich hybrid waveguide
Authors: Dash Rahul K , Selvaraja Shankar Kumar
Published: October 2020

Grating couplers with coupling efficiency of -3.27 dB (TE) and -8 dB (TM) are demonstrated in a novel SiN/a-Si/SiN sandwich-waveguide with a 3dB bandwidth ~100 nm in the C-band for linear and non-linear photonics.
Ultrafast laser inscription of volume phase optics: Towards a scalar vortex mask for broadband coronagraphy
Authors: Johnston Benjamin F. , Jovanovic Nemanja , Gross Simon , Serabyn Eugene , Ruane Garreth , Mawet Dimitri , Martin Stefan , Withford Michael J.
Published: October 2020

We report on an investigation using ultrafast laser inscription in borosilicate glasses to create in-volume phase optics. An application of an optic fashioned in this way is discussed in the context of broadband “scalar vortex coronagraphy” for astronomical imaging.
High-Pressure Silicon Phase Created by High Power Ultrashort Laser Pulse at the Intensity of 1019 W/cm2
Authors: Rapp Ludovic , Smilie Lachlan , Gamaly Eugene , Rode Andrei , Ozaki Norimasa , Sagae Daisuke , Kodama Ryosuke , Mukai Keiichiro , Matsuoka Takeshi , Pikuz Tatiana , Seto Yusuke , Syobu Takahisa , Tominaga Aki , Firestein Konstantin , Golberg Dmitri
Published: October 2020

Material states formed by high-power laser demonstrate new pathways for engineering polymorphs with novel optoelectronic properties. We present the observation of silicon phases only seen until now in laboratory experiments by ultrashort laser confined microexplosion.
3 watt 1.7 μm fiber gas Raman laser in D2-filled HC-PCFs
Authors: Li Hao , Huang Wei , Cui Yulong , Zhou Zhiyue , Wang Zefeng
Published: October 2020

We report a high-power 1.7 pm fiber laser based on D2-filled hollow-core photonic crystal fibers (HC-PCFs) by rotational stimulated Raman scattering (SRS). Pumped with an Erbium-doped fiber amplified diode, a maximum average power of ~2.91 W is achieved with 20- meter-long HC-PCF, giving a maximum Raman power conversion efficiency of ~57.8%.
Modal decomposition of measured near-field and far-field beams with partial coherence based on SPGD algorithm
Authors: Choi Kyuhong , Kim Youngchan , Yun Youngsun , Noh Young-Chul , Jun Changsu
Published: October 2020

By including the additional variable, degree of coherence (DOC) in stochastic parallel gradient descent (SPGD) algorithm, we could improve the accuracy of modal decomposition which satisfies both measured near-field and far-field laser beams.
Research and Application on The Key Techniques of Conformal Vibration Polishing on Optics
Authors: Hou Jing , Liu Shiwei , Zhang Qinghua , Wang Jian , Xu Qiao , Chen Xianhua , Liao Defeng
Published: October 2020

A conformal vibration polishing method combining high-frequency short-stroke vibration for efficiently manufacturing optics is introduced. The efficient removal characteristics and excellent smoothing ability of the method were verified by theoretical derivation and verification experiments.
High Extinction Ratio in Silicon-ITO Heterojunction based Optical Modulator
Authors: Rajput Swati , Babu Prem , Kaushik Vishal , Singh Lalit , Jain Sourabh , Kumar Mukesh
Published: October 2020

An optical modulator based on carrier accumulation in Silicon-ITO heterojunction is proposed with a high extinction ratio of 15dB/mm. Electrical-tuning in ITO enables efficient optical-modulation of the coupled optical mode guided in Si-ITO structure.
Improving Regenerative Capability of Nonlinear-optical Loop Mirror (NOLM)-based All-optical Regenerators by adopting a Polarization-Maintaining Coupler
Authors: Shao Long , Guo Biao , Wen Feng , Cai Yaqi , Wu Baojian , Yang Feng , Qiu Kun
Published: October 2020

We experimentally demonstrate a polarization-maintaining coupler based nonlinear-optical loop mirror (PMC-NOLM) regenerator, improving the noise-handling capability over 100% compared to conventional schemes. The amplitude-distortion suppression of 60% and Q-factor improvement of 3.5dB are achieved.
The Pre-configured Kramers-Kronig Scheme
Authors: Lu Dongxu , Yang Tao , Huo Jiahao , Yuan Jinhui , Long Keping , Zhou Xian
Published: October 2020

A pre-configured Kramers-Kronig (Pre-KK) scheme is proposed for single sideband (SSB) systems and demonstrated that a better performance can be achieved than traditional KK scheme because of reducing the requirement of DAC and ADC resolution.
Interrogation of photonic biosensors using dual optical frequency combs
Authors: Knoerzer Markus , Szydzik Crispin , Ren Guanghui , Huertas Cesar S. , Nguyen Thach G. , Bui Lam , Boes Andreas , Mitchell Arnan
Published: October 2020

Dual frequency combs are used to extract a linear phase response of interferometric biosensors while being independent of the bias point and offering common-mode rejection and low noise.
Linewidth narrowing and power enhancement in polariton lasers through the use of etalons
Authors: Zheng Yameng , Pask Helen , Spence David , Lee Andrew
Published: October 2020

By incorporating an etalon within an intracavity continuous wave terahertz polariton laser, we achieve a ten-fold reduction in linewidth, plus a factor of two increase in the THz output power.
Towards Identifying Grass Seed Infestation in the Australian Sheep Using Terahertz Radiation
Authors: Shastri M. , Macharla P. , Thigale S. , Goldys E. , Atakaramians S.
Published: October 2020

Early detection of seeds, as a precursor tool for the prevention of Grass Seed Infestation, is analysed. It is demonstrated that terahertz time-domain spectroscopy and imaging techniques can be utilized to identify seeds in sheep-wool.
Nitrate sensing using optical properties of PEDOT at the tip of the fibre
Authors: Shahnia Soroush , Evans Drew , Lancaster David G. , Ebendorff-Heidepriem Heike , Shahraam Shahraam , Afshar V
Published: October 2020

A sensing platform measuring the change in back reflection of PEDOT:Tos through a circulator is presented, enabling nitrate ion sensing as the refractive index and volume of PEDOT:Tos change at the tip of the optical fibre.
Development of optical system for measuring velocity of cerebrospinal fluid in shunt system
Authors: Amemiya Shumpei , Watanabe Hiroyasu , Shoji Ichiro , Aihara Yasuo
Published: October 2020

We have suceeded in measuring the velocity of cerebrospinal fluid in shunt system using the laser-two-focus velocimeter. This is accomplished by inserting air lumps in the shunt tube which move together with the fluid.
Skewed Microlens on Addressable VCSEL Arrays for Energy-efficient LiDAR Scanning
Authors: Jeong H. , Jeong C. M. , Jang D. J. , Park S. W. , Yoon H. S. , Jang J. H. , Lim C. M.
Published: October 2020

We report a novel optoelectronic scheme to control the shape and divergence of laser beams for energy-efficient LIDAR systems adopting skewed microlens on addressable VCSEL arrays.
High-Quality 3D Display for Integral Imaging Microscope Using Deep Learning Depth Estimation Algorithm
Authors: Kwon Ki-Chul , Kwon Ki Hoon , Erdenebat Munkh-Uchral , Lim Young-Tae , Jeong Jong-Rae , Kim Min Young , Kim Nam
Published: October 2020

The high-quality visualization method for integral imaging microscope using deep learning depth estimation algorithm is proposed. The point cloud model is regenerated from the accurate depth information and a high-resolution image and displayed.
Integrated waveguide and micro-ring resonator polarizers with 2D layered graphene oxide films
Authors: Qu Yang , Wu Jiayang , Yang Yunyi , Xu Xingyuan , Liang Yao , Chu Sai T. , Little Brent E. , Morandotti Roberto , Jia Baohua , Moss David J.
Published: October 2020

We experimentally demonstrate integrated waveguide and micro-ring resonator polarizers incorporating two-dimensional layered graphene oxide films, with a high polarization dependent loss of 53.8 dB and a high polarization extinction ratio of 8.3 dB, respectively.
Visible Light Enabled Janus Indium Oxysulfide Nanoflakes for Ultrasensitive Chemical Sensing
Authors: Xu Kai , Ren Guanghui , Wen Xiaoming , Zavabeti Ali , Ou Jian Zhen
Published: October 2020

Achieving high-performance in low temperature is challenging for conventional two-dimensional gas-sensing materials. With an optimized liquid-phase-exfoliation approach, we present the first atomically-thin Janus metal oxychalcogenide heterojunctions, exhibiting extraordinary gas sensitivity at room-temperature with visible-light excitation.
Stretchable Perovskite Light-emitting Devices
Authors: Li Yun-Fei
Published: October 2020

A stretchable organometal-halide-perovskite quantum-dot LED with both high efficiency and mechanical compliancy is reported with a luminescent efficiency of 9.2 cd/A and mechanical deformations up to 50% tensile strain.
Experimental investigation of a Bell’s inequality by using joint measurements
Authors: Matsuyama Kengo , Hofmann Holger F. , Iinuma Masataka
Published: October 2020

To clarify the relation between a Bell’s inequality and measurement uncertainty, we have experimentally introduced joint measurements of two complementary polarizations. Joint statistics can be obtained because measurement uncertainties reduce the observed correlations.
High-dimensional quantum gates for azimuthal modes
Authors: Dahl Daniel S. , Romero Jacquiline , Ploschner Martin , Fontaine Nicolas K. , Carpenter Joel
Published: October 2020

We propose several high-dimensional (d=101 and d= 59) quantum gates operating upon the azimuthal Laguerre-Gaussian modes. Gates demonstrated include X, Z, Fourier and a device for use as part of an arbitrary XN Z gate.
Real-time Jones phase microscopy for studying transparent and birefringent specimens
Authors: Jiao Yuheng , Kandel Mikhail E. , Liu Xiaojun , Lu Wenlong , Popescu Gabriel
Published: October 2020

Tissue birefringence is an intrinsic marker of potential value for cancer diagnosis. Traditionally, birefringence properties have been studied by using intensity-based formalisms, through the Mueller matrix algebra. On the other hand, the Jones matrix description allows for a direct assessment of the sample’s anisotropic response. However, because Jones algebra is based on complex fields, requiring measurements of both phase and amplitude, it is less commonly used. Here we propose a real-time imaging method for measuring Jones matrices by quantitative phase imaging. We combine a broadband phase imaging system with a polarization-sensitive detector to obtain Jones matrices at each point in a megapixel scale image, with near video rate capture speeds. To validate the utility of our approach, we measured standard targets, partially birefringent samples, dynamic specimens, and thinly sliced histopathological tissue.
Snapshot multispectral imaging using a pixel-wise polarization color image sensor
Authors: Ono Shuji
Published: October 2020

This study proposes a new imaging technique for snapshot multispectral imaging in which a multispectral image was captured using an imaging lens that combines a set of multiple spectral filters and polarization filters, as well as a pixel-wise color polarization image sensor. The author produced a prototype nine-band multispectral camera system that covered from visible to near-infrared regions and was very compact. The camera’s spectral performance was evaluated using experiments; moreover, the camera was used to detect the freshness of food and the activity of wild plants and was mounted on a vehicle to obtain a multispectral video while driving.
Generation of strong-field spectrally tunable terahertz pulses
Authors: Ovchinnikov A. V. , Chefonov O. V. , Agranat M. B. , Fortov V. E. , Jazbinsek M. , Hauri C. P.
Published: October 2020

The ideal laser source for nonlinear terahertz spectroscopy offers large versatility delivering both ultra-intense broadband single-cycle pulses and user-selectable multi-cycle pulses at narrow linewidths. Here we show a highly versatile terahertz laser platform providing single-cycle transients with tens of MV/cm peak field as well as spectrally narrow pulses, tunable in bandwidth and central frequency across 5 octaves at several MV/cm field strengths. The compact scheme is based on optical rectification in organic crystals of a temporally modulated laser beam. It allows up to 50 cycles and central frequency tunable from 0.5 to 7 terahertz, with a minimum width of 30 GHz, corresponding to the photon-energy width of ΔE=0.13 meV and the spectroscopic-wavenumber width of Δ(λ−1)=1.1 cm−1. The experimental results are excellently predicted by theoretical modelling. Our table-top source shows similar performances to that of large-scale terahertz facilities but offering in addition more versatility, multi-colour femtosecond pump-probe opportunities and ultralow timing jitter.
Overcome chromatism of metasurface via Greedy Algorithm empowered by self-organizing map neural network
Authors: Zhu Ruichao , Wang Jiafu , Qiu Tianshuo , Sui Sai , Han Yajuan , Jia Yuxiang , Li Yongfeng , Yan Mingbao , Pang Yongqiang , Xu Zhuo , Qu Shaobo
Published: October 2020

Chromatism generally exists in most metasurfaces. Because of this, the deflected angle of metasurface reflectors usually varies with frequency. This inevitably hinders wide applications of metasurfaces to broadband signal scenarios. Therefore, it is of great significance to overcome chromatism of metasurfaces. With this aim, we firstly analyze necessary conditions for achromatic metasurface deflectors (AMD) and deduce the ideal dispersions of meta-atoms. Then, we establish a Self-Organizing Map (SOM) Neural Network as a prepositive model to obtain a diversified searching map, which is then applied to Greedy Algorithm to search meta-atoms with the required dispersions. Using these meta-atoms, an AMD was designed and simulated, with a thickness about 1/15 the central wavelength. A prototype was fabricated and measured. Both the simulation and measurement show that the proposed AMD can achieve an almost constant deflected angle of 22° under normal incidence within 9.5–10.5GHz. This method may find wide applications in designing functional metasurfaces for satellite communications, mobile wireless communications and others.
Dual-channel optical switch, refractive index sensor and slow light device based on a graphene metasurface
Authors: Jiang Xinpeng , Chen Dingbo , Zhang Zhaojian , Huang Jie , Wen Kui , He Jie , Yang Junbo
Published: October 2020

In this paper, we propose a graphene-based metasurface that exhibits multifunctions including tunable filter and slow-light which result from surface plasmon polaritons (SPPs) of graphene and plasmon induced transparency (PIT), respectively. The proposed metasurface is composed by two pairs of graphene nano-rings and a graphene nanoribbon. Each group of graphene rings is separately placed on both sides of the graphene nanoribbon. Adjusting the working state of the nanoribbon can realize the functional conversion of the proposed multifunctional metasurface. After that, in the state of two narrow filters, we put forward the application concept of dual-channel optical switch. Using phase modulation of PIT and flexible Fermi level of graphene, we can achieve tunable slow light. In addition, the result shows that the graphene-based metasurface as a refractive index sensor can achieve a sensitivity of 13670 nm/RIU in terahertz range. These results enable the proposed device to be widely applied in tunable optical switches, slow light, and sensors.
Influence of DC electric field on Nd:YAG laser-induced breakdown in gases
Authors: Takahashi Eiichi , Kato Susumu
Published: October 2020

It is well known that pulsed laser can easily generate breakdown plasmas when the beam is focused. The laser-based gas breakdown phenomenon is caused by multiphoton ionization (MPI) and cascade ionization (CI) in a high-intensity electric field near the focal region. However, the phenomenon is complicated because it is affected by the purity of the gas and the focusing quality of the laser and optical systems. For a comprehensive understanding of the laser-induced breakdown phenomenon, the influence of an electric field on the threshold intensity of the laser-induced breakdown was investigated. The applied field disperses electrons generated in the focal area by the intense laser field, thereby increasing the laser-induced breakdown threshold intensity. The observed phenomenon is explained by a simple electron balance model.