bluuebunny/crossref_metadata_2025 huggingface dataset:
Axial resolution improvement of two-photon microscopy by multi-frame reconstruction and adaptive optics
Authors: Ye Shiwei , Yin Yixuan , Yao Jing , Nie Jun , Song Yuchen , Gao Yufeng , Yu Jia , Li Hui , Fei Peng , Zheng Wei
Published: October 2020

Two-photon microscopy (TPM) has been widely used in biological imaging owing to its intrinsic optical sectioning and deep penetration abilities. However, the conventional TPM suffers from poor axial resolution, which makes it difficult to recognize some three-dimensional fine features. We present multi-frame reconstruction two-photon microscopy (MR-TPM) using a liquid lens as a fast axial scanning engine. A sensorless adaptive optics (AO) approach is adopted to correct the aberrations caused by both the liquid lens and the optical system. By overcoming the effect of optical aberrations, inadequate sampling, and poor focusing capability of a conventional TPM, the axial resolution can be improved by a factor of 3 with a high signal-to-noise ratio. The proposed technology is compatible with the conventional TPM and requires no optical post-processing. We demonstrate the proposed method by imaging fluorescent beads, in vitro imaging of the neural circuit of mouse brain slice, and in vivo time-lapse imaging of the morphological changes of microglial cells in septic mice model. The results suggest that the axon of the neural circuit and the process of microglia along the axial direction, which cannot be resolved using conventional TPM, become distinguishable using the proposed AO MR-TPM.
Optical vortex induced flower-shaped surface relief of azo-polymers
Authors: Shiraishi Ami , Masuda Keigo , Miyamoto Katsuhiko , Omatsu Takashige
Published: October 2020

We discover that a flower-shaped surface relief on azo-polymer film is formed by irradiation of picosecond optical vortex pulses owing to nonlinear spatial modulation instability of optical vortex in azo-polymers.
Optical single-shot spatial state tomography
Authors: Carpenter Joel , Fontaine Nicolas K.
Published: October 2020

We propose a device for measuring the spatial state of a beam, whereby all required measurements to construct the density matrix are performed single-shot using lossless components, rather than through sequential projections. © 2020 The Author(s)
Application of Optical Coherence Tomography on In-vivo Cervical Screening
Authors: Ren Chenchen , Wang Baojin , Zeng Xianxu , Jiang Zhaoning , Ma Huan , Zhang Xiaoan
Published: October 2020

OCT was used for in-vivo cervical screening for 350 patients. Characteristics cervical structures were observed in OCT images. Satisfactory sensitivity (84.9%), specificity (85.7%) and accuracy (85.4%) results demonstrate OCT’s great potential for in-vivo cervical screening. © 2020 The Author(s)
Algorithmic Spectral Reconstruction Using Angularly Tuned Zero-Contrast Gratings
Authors: Russell Benjamin , Meng Jiajun , Wen Dandan , Cadusch Jasper , Ye Ming , Crozier Kenneth
Published: October 2020

We experimentally demonstrate the algorithmic reconstruction of the infrared transmission spectrum of a polymer using a zero-contrast waveguide-grating metasurface as a filter. By changing the metasurface angle, a variety of filter functions are obtained. © 2020 The Author(s)
Measuring the wafer thickness and refractive index by spectral interferometry of optical frequency comb
Authors: Xiong Shilin , Yang Yuetang , Wu Guanhao
Published: October 2020

We present a spectral interferometry method of optical frequency comb for measuring the thickness and refractive index distribution of silicon wafer. The repeatability of thickness measurement is 50 nm, and the stability of refractive index is 5×10-4. © 2020 The Author(s)
Strong third-order Kerr nonlinearity in 2D PdSe2 dichalcogenide films
Authors: Jia Linnan , Wu Jiayang , Yang Tieshan , Jia Baohua , Moss David J.
Published: October 2020

We characterize the third-order optical nonlinearity in PdSe2 dichalcogenide films via the Z-Scan technique. A strong and negative (self-defocusing) Kerr nonlinearity (n2) of ∼ ‒ 7.65×10-16 m2/W is observed at 800 nm. © 2020 The Author(s)
Monolithic piezoelectric control of integrated soliton microcombs
Authors: Liu Junqiu , Tian Hao , Lucas Erwan , Raja Arslan S. , Lihachev Grigory , Wang Rui N. , He Jijun , Liu Tianyi , Anderson Miles H. , Weng Wenle , Bhave Sunil A. , Kippenberg Tobias J.
Published: October 2020

We demonstrate piezoelectric actuators integrated on ultralow-loss Si3N4 waveguides with MHz bandwidth, ultra-low power, bi-polar. The voltage applied on the actuator is used to tune the microresonator, initiate, switch, stabilize, tightly phase lock soliton microcombs. © 2020 The Author(s)
Observation of Luminescence Dynamics of Plasma Excited by Femtosecond Laser Ablation of Copper
Authors: Yamada Ryohei , Sakurai Haruyuki , Konishi Kuniaki , Yumoto Junji , Kuwata-Gonokami Makoto
Published: October 2020

We demonstrated the time-resolved luminescence spectroscopy during femtosecond laser ablation with a streak camera. We observed the luminescence dynamics of the plasma and found relationships between the plasma temperature dynamics and ablated morphology.
Terahertz Radar Based on Leaky-wave Coherence Tomography
Authors: Monnai Yasuaki
Published: October 2020

Architecture of integrated terahertz radar capable of beam steering and homodyne detection by frequency sweeping is presented. It is based on directional coupling of terahertz waves launched and captured by a pair of leaky-wave antennas.
Suitable fault-tolerant schemes for cavity-QED-based quantum computation
Authors: Asaoka Rui , Tokunaga Yuuki , Kanamoto Rina , Goto Hayato , Koshino Kazuki , Aoki Takao
Published: October 2020

We show that the requirement for fault-tolerant quantum computation based on cavity-QED is dramatically relaxed by applying the suitable fault-tolerant schemes and gate error optimization for chosen two-qubit gate method.
Arbitrary Mixing of Spectral Multimode Quantum States Generated by Dispersion-Engineered Nonlinear Crystal
Authors: Yamagishi Yuta , Omi Akihito , Hosaka Aruto , Takahashi Kazuki , Kannari Fumihiko
Published: October 2020

We generate spectral multimode squeezed states and demonstrate quantum mode mixing, a method to arbitrarily mix the spectral multimode quantum states of light using a type-II PPLN waveguide, which is applicable to quantum simulators.
Label-Free Quantitative Polymerase Chain Reaction in an Optical Fibre Microcavity
Authors: Li Xuegang , Nguyen Linh V. , Hill Kelly , Ebendorff-Heidepriem Heike , Schartner Erik P. , Zhao Yong , Zhou Xue , Zhang Yanan , Warren-Smith Stephen C.
Published: October 2020

We demonstrate quantitative polymerase chain reaction (qPCR) using an all-fibre all-optical device. Through direct optical measurement of the sample refractive index, we show the potential of the system to operate as a label-free qPCR system.
Laser patterned flow-through filters for paper-based immunoassays
Authors: Galanis P. P. , He P. J. W. , Katis I. N. , Iles A. H. , J A.J.U. Kumar , Eason R. W. , Sones C. L.
Published: October 2020

We report the use of laser direct-writing for creation of size-exclusive, flow-through filters in paper-based devices. The usefulness of this novel filtration approach is demonstrated via an immunoassay that detects a common inflammation marker CRP.
Enhanced Mid -Infrared Reflectance with Graphene Coated Silicon Carbide Nanowires
Authors: Rufangura Patrick , Agrawal Arti , Bosi Matteo , Folland Thomas G. , Caldwell Joshua D. , Iacopi Francesca
Published: October 2020

The mid-infrared optical spectrum hosts a variety of promising photonic applications. Herein we simulate and experimentally demonstrate reflectance enhancement of MIR light using graphene-coated silicon carbide nanowires on silicon, showing promise for on-chip MIR nanophotonics.
Atomically thin 2D meta-optics
Authors: Li Xiangping
Published: October 2020

Here, we show that high loss in an atomic-thick transition metal dichalcogenide film coated on a uniform Fabry-Perot substrate can enable singular phase shift. Leveraging the appealing feature, meta-optics from metaholograms, metalens to color prints can be demonstrated with the thickness approaching to the physical limit.
Large pure temporal dispersion for ultrafast spectroscopy
Authors: Chen Liao , Dong Xin , Yang Ningning , Zhang Lei , Zhou Xi , Lei Zihui , Zhang Chi , Zhang Xinliang
Published: October 2020

Pure temporal dispersion based on optical phase conjugation is proposed for photonic time-stretch applications. It achieves 1776.919-ps2 diserpsion with zero third-order dispersion and greatly improves system parameters of ultrafast spectroscopy including accuracy, resolution and bandwidth.
Silicon photonics for spatially multiplexed high capacity optical fiber communications
Authors: Tsang Hon Ki , Tong Yeyu
Published: October 2020

We describe recent progress in the design of multimode waveguide grating couplers which serve as key functional elements for the simultaneous selective launch or reception of multiple modes in few-mode fibres for mode-division-multiplexed communications.
Ultra-compact and Low Crosstalk 1xN Multimode Interference Splitter on Silicon-on-insulator
Authors: Desai Smit , Yang Gang , Li Liwei , Yi Xiaoke
Published: October 2020

We present a compact silicon-on-insulator multimode interference power splitter based on nonuniform optical waveguides, which achieves crosstalk reduction, a high uniformity and small device footprint while maintaining a low insertion loss.
Integrated photonic coupled Sagnac loop reflectors for flat-top wavelength interleaving and switching
Authors: Arianfard Hamed , Wu Jiayang , Moss David J.
Published: October 2020

We investigate integrated photonic resonators formed by coupled Sagnac loop reflectors (CSLR). Mode splitting in the CSLR resonator is tailored to provide flat-top spectral response for wavelength interleaving and non-blocking switching functions in C band.
High-power THz sources based on ultrafast thin-disk lasers
Authors: Meyer Frank , Vogel Tim , Hekmat Negar , Ahmed Shahwar , Omar Alan , Wang Yicheng , Hoffmann Martin , Saraceno Clara
Published: October 2020

We present latest progress in the demonstration of single-cycle THz sources with high average power, based on excitation with MHz repetition rate, hundred-watt class modelocked thin-disk oscillators
Designing tomorrow’s quantum internet
Authors: Munro William J. , Nemoto Kae
Published: October 2020

The design of any future quantum internet will rely on quantum repeaters and how information is transmitted through it. It is already well known that the task that would be performed within such an internet will go well beyond quantum key distribution and are likely to include quantum remote sensing and distributed quantum computation. In this presentation we will discuss a number of design options possible to support those advanced tasks. At the heart of this will be quantum routing which is highly dependent on the quantum repeater architecture. We will introduce a quantum quality of service to characterize the potential performance of a quantum internet and shows how it leads interesting network and routing behavior.
Two-photon Comb with Wavelength Conversion for Long-distance Quantum Communication
Authors: Niizeki Kazuya , Yoshida Daisuke , Ito Ko , Nakamura Ippei , Takei Nobuyuki , Okamura Kotaro , Zheng Ming-Yang , Xie Xiu-Ping , Horikiri Tomoyuki
Published: October 2020

We demonstrate two-photon comb (TPC) technique and wavelength conversion. TPC consists of telecom entangled photon pairs with narrow linewidth and two-photon coincidence after conversion was observed. 20-km distribution was also achieved aiming at quantum internet.
Nonreciprocal propagation of light in a chiral optical cross-Kerr nonlinear medium
Authors: Xia Keyu , Nori Franco , Xiao Min
Published: October 2020

Here, we present a novel optical medium with chiral cross-Kerr nonlinearity to bypass the so-called “dynamic reciprocity” in nonlinear optics, allowing us to perform the optical isolators and circulators without applying external magnetic fields.
Tunable dual-color picosecond pulses from passive synchronized fiber lasers for coherent anti-Stokes Raman imaging
Authors: Shen Yue , Ao Jianpeng , Yang Kangwen , Zheng Shikai , Hao Qiang , Huang Kun , Ji Minbiao , Zeng Heping
Published: October 2020

Polarization-maintaining passively synchronized ytterbium and erbium fiber lasers were demonstrated to deliver tunable pulses of 1016-1048 nm and frequency doubled pulses at 790 nm, which were used in coherent anti-Stokes Raman imaging.
Ultra-Broadband Compact Polarization Beam Splitter Based on Asymmetric Etched Directional Coupler
Authors: Mao Simei , Cheng Lirong , Mu Xin , Wu Sailong , Fu H. Y.
Published: October 2020

We propose an ultra-broadband polarization beam splitter with 4.6 pm coupling length. Extinction ratio over 10 dB and insertion loss less than 1 dB are achieved over bandwidth of 420 nm centred at 1460 nm.
A Polarization insensitive Athermal design for Mach-Zehnder Interferometer
Authors: Mohammed Zakriya , Paredes Bruna , Rasras Mahmoud
Published: October 2020

An all-silicon Mach-Zehnder interferometer that is thermally insensitive for both the TE and TM fundamental modes is proposed. The design demonstrates near-zero temperature sensitivity at 1310 nm wavelength.
Enhanced Light Coupling Efficiency between III-V Nanowire Emitters and Silicon on Insulator Waveguides
Authors: Aghaeipour Mahtab , Kasper Laura , Geelhaar Lutz , Bruns Juergen
Published: October 2020

We theoretically show that by arranging III-V nanowire emitters in a two-dimensional array on silicon waveguides the coupling efficiency enhances almost twice than that of in a onedimensional array, promising for silicon photonics applications.
Optimization of pump scheme for low frequency noise 2 μm polarization-maintaining single frequency fiber laser
Authors: Zhang Qian , Hou Yubin , Wang Xi , Song Weihua , Zhao Chunnong , Chen Xu , Wang Pu
Published: October 2020

We report 2-μm single-frequency polarization-maintaining fiber-laser with optimized frequency noise below 100 Hz/Hz1/2 between 30 Hz to 100 kHz in which a single-frequency 1.5μm DFB diode and Er-doped fiber-amplifier is used as pumping source.
Dysprosium Doped ZBLAN Yellow Fibre Lasers
Authors: Amin M. Z. , Majewski M. R. , Jackson S. D.
Published: October 2020

We report a dysprosium doped ZBLAN yellow fibre laser by exploiting 4F9/2 to 6H13/2 transition of a dysprosium ion. A GaN laser diode emitting at 445 nm is used as a pump source.
Effect of Hybrid Gain Medium and Four Wave Mixing in Multiwavelength Fiber Laser
Authors: Sulaiman A. H. , Ramachandran D. , Abdullah F. , Ismail A. , Jamaludin M. Z.
Published: October 2020

Effect of hybrid gain medium and highly nonlinear fiber on multiwavelength fiber laser is presented. Hybrid gain medium produces more lasing lines (50) and higher extinction ratio (17 dB) compared to single gain medium.
Transient Stimulated Raman Amplification of the Supercontinuum in KGW with Pulse Compression
Authors: Mackonis Paulius , Rodin Aleksej M. , Petrulenas Augustinas , Girdauskas Vytenis , Michailovas Andrejus
Published: October 2020

Stimulated Raman amplification of the IR-wing of the supercontinuum in KGW was studied with 1.2 ps pump pulses. The formation of a 25 nm gain bandwidth, а 15-fold incident pump and pulse compression to 320 fs were demonstrated.
Ultrafast Light Redistribution Between Diffraction Orders by GaAs Metasurface
Authors: Shorokhov Alexander S. , Gulkin Dmitry N. , Snigirev Viacheslav S. , Ryabko Maxim V. , Bessonov Vladimir O. , Fedyanin Andrey A.
Published: October 2020

We study an ultrafast light deflection dynamics by GaAs metasurface pumped with a femtosecond laser and experimentally demonstrate the redistribution of the energy between diffraction orders under non-uniform absorption of nanoantennas forming the structure.
Broadband Ultra-flat Optics With Experimental Efficiencies Exceeding 99% at Visible Wavelengths
Authors: Burguete-Lopezl Arturo , Getman Fedor , Makarenko Maksim , Fratalocchi Andrea
Published: October 2020

We present a platform by which high experimental efficiency (up to 99.2%), ultra-flat (down to 50nm) optics such as polarizer beam splitters, dichroic mirrors and polarization dependent colour filters can be produced in the visible. © 2020 The Author(s)
Spectroscopic X-Ray Ghost Imaging
Authors: He Yu-Hang , Zhang Ai-Xin , Huang Yi-Yi , Yu Wen-Kai , Chen Li-Ming , Wu Ling-An
Published: October 2020

Energy-selective spectroscopic x-ray ghost imaging under low illumination is demonstrated with a single-pixel detector for the first time. A spatial resolution of 10 pm and spectral resolution of 1.5 keV were attained.
Development of optically active solid medium for next generation long term high capacity optical data storage
Authors: Gao Le , Zhang Qiming , Evans Richard A. , Gu Min
Published: October 2020

A newly synthesized solid state optically active polymeric material is developed for ultra-high density of three dimensional multi-layered optical data storage utilizing direct laser writing technique, suitable for archiving long-term data for centuries.
Integrated-optic spectrum synthesizer with loop-back paths for processing 10 GHz-spaced frequency comb
Authors: Takiguchi Koichi
Published: October 2020

We report an integrated-optic spectrum synthesizer with loop-back paths and an interleaved filter, which can independently manipulate the amplitude and phase of 10 GHz- spaced frequency components. We applied the synthesizer to optical OFDM signal generation.
Brillouin-Assisted Supramolecular Soliton Array Generation in Optical Fiber Kerr Resonator
Authors: Moon Kyoung Jun , Han Dae Seok , Kang Myeong Soo
Published: October 2020

We report the generation of a supramolecular structure of 3.2-ns-spaced multiple cavity solitons via the interplay between the Kerr effect and Brillouin scattering in a fiber Kerr resonator. Pulsed pumping and continuous-wave pumping are compared.
Dual-Comb Spectroscopy in the 2 pm Region Using Quantum Well Diode Lasers
Authors: Sterczewski Lukasz A. , Frez Clifford , Forouhar Siamak , Burghoff David , Bagheri Mahmood
Published: October 2020

We present quantum well diode laser frequency combs suitable for free-running dual-comb spectroscopy in the 2 pm region. A 600-GHz-wide dual-comb spectrum of a low- finesse etalon is measured in 1 millisecond with 4.1% precision.
Optical frequency comb generation using low stress reactive sputtered silicon nitride waveguides
Authors: Frigg Andreas , Boes Andreas , Ren Guanghui , Nguyen Thach G. , Choi Duk-Yong , Gees Silvio , Moss David , Mitchell Arnan
Published: October 2020

We demonstrate fully CMOS-compatible anomalous dispersive SiN microring resonators with an intrinsic Q factor of 6.6 x 105 based on reactive sputtering SiN, yielding in a 250 nm wide modulation-instability frequency comb.
Optimal Monitoring of Deviations from Target Polarization with Metasurfaces
Authors: Lung Shaun , Zhang Jihua , Wang Kai , Kamali Khosro Zangeneh , Rahmani Mohsen , Neshev Dragomir N. , Sukhorukov Andrey A.
Published: October 2020

We reveal that dielectric metasurfaces can perform tailored non-Hermitian transformations optimized for monitoring of deviations around arbitrarily linear, circular, or elliptical polarizations, delivering the amplified vertical-to-horizontal polarization ratios for sensitive single-shot detection.
Multilevel Nanoimprint Lithography for Plasmonic Pixels Printing
Authors: Shahidan Muhammad Faris Shahin , Song Jingchao , James Timothy D. , Roberts Ann
Published: October 2020

We demonstrate printing of multilevel (3-dimensional) plasmonic pixel using UV-assisted nanoimprint lithography (NIL) with a simple 2-dimensional binary (two-step) mold in a single print by harnessing nanofluidics of the polymer resist through strategic mold design.
Robustness of Digital Spectrum-based Filter Failure Identification when Filter Tightening & Filter Shift Co-Exist
Authors: Shu Liang , Yu Zhenming , Wan Zhiquan , Xu Kun
Published: October 2020

We investigate the robustness of digital spectrum-based filter failure identification method when filter tightening and filter shift co-exist. Four co-existence types are considered and extensive numerical results represent excellent robustness of the proposed method.
Dual Coherent Sampling for Statistical Error-Vector-Magnitude Monitoring of Nonlinearly Phase Distorted Signals
Authors: Sakamoto Takahide , Yamazaki Masaki , Kouguchi Ryo
Published: October 2020

We investigate a coherent dual sampling system for monitoring nonlinearly phase distorted signals. Without relying on high-speed digital signal processing, error vector magnitudes are statistically analyzed using time-separated dual sample points.
Crossing the exceptional point in a hybrid plasmonic fiber
Authors: Tuniz Alessandro , Wieduwilt Torsten , Schmidt Markus A.
Published: October 2020

We experimentally demonstrate a hybrid plasmonic fiber with tuneable Eigenmode interactions near the exceptional point, via near-infrared transmission experiments. We present a design at visible wavelengths, extending design opportunities for tuneable non-Hermitian waveguide systems.
Supercontinuum Generation with Circularly Polarized Vortex Modes in a Chiral Three-Core PCF
Authors: Roth Paul , Wong Gordon K. L. , Frosz Michael H. , Russell Philip St.J.
Published: October 2020

We report generation of circularly polarized supercontinuum light (850-1650 nm) in a single vortex mode using a chiral three-core PCF. We show chiral multicore PCFs enable robust maintenance of circularly polarized vortex modes.
Integrated Ge-Sb-S chalcogenide microresonator on chip for nonlinear photonics
Authors: Xia Di , Yang Zelin , Zeng Pingyang , Huang Yufei , Sun Yaodong , Pan Jingshun , Song Jingcui , Zhu Ying , Guo Hairun , Zhang Bin , Li Zhaohui
Published: October 2020

We demonstrated an integrated environment friendly chalcogenide glasses (ChG)-microresonator with a loaded Q-factor of ~0.4 million. Kerr combs in the ChG-based resonators were firstly observed.
Transmitted-type guided-mode resonance phase image system for sensing refractive index distribution
Authors: Kuo Wen-Kai , Yang Shi-Wei , Gao Po-Chean
Published: October 2020

We propose a transmitted-type guided-mode resonance (GMR) image system to display refractive index (RI) distribution over the GMR structure using phase values obtained by the five-step phase shift interferometry. The primary result shows that this system can obtain a phase image corresponding to two area with two different material RIs, 1.0 (air) and 1.4 (polymer), respectively, on the GMR device surface and their phase difference is 140°.
Stable Photoluminescence Enhancement of MoS2 Buried in PDMS via Plasmonic Surface Lattice Resonance
Authors: Lu Tsan-Wen , Chiang Yen-Ju , Huang Pin-Ruei , Lin Shih-Yen , Lee Po-Tsung
Published: October 2020

By integrating silver nanodisks with plasmonic surface lattice resonance, a large-area MoS2 monolayer buried in polydimethylsiloxane substrate can show over 7-fold photoluminescence enhancement. This enhancement is quite stable even under different applied stretching strains.
Neural Networks and Spatial Domain Technologies in High-Speed Optical Wireless Communications
Authors: Wang Ke , Song Tingting , Lee Jeonghun , Kandeepan Sithamparanathan , Alameh Kamal , Li Hongtao , He Jiayuan
Published: October 2020

Optical wireless communications (OWCs) have been widely studied to provide high-speed wireless communications in short-range applications. In this paper, we review recent progress of spatial domain technologies and use of neural networks in OWC systems.
Secure Free-Space Optical Transmission of Y-00 Quantum Stream Cipher with 4096-Level Intensity Modulated Signals
Authors: Futami Fumio , Tanizawa Ken , Bekkali Abdelmoula , Fujita Hideo
Published: October 2020

A secure free-space optical (FSO) system using a Y-00 quantum stream cipher is proposed and error-free (BER<10-9) secure FSO transmission over 30 m is achieved with a real-time 1.5-Gb/s Y-00 cipher with 4096 intensity levels.
Occlusion capable augmented reality display using transmissive dihedral corner reflector array and a digital micromirror device
Authors: Ju Yeon-Gyeong , Min Sung-Wook , Choi Hee-Jin , Park Jae-Hyeung
Published: October 2020

We propose an occlusion-capable near-eye display for augmented-reality. The combination of a transmissive dihedral corner reflector and a single digital micromirror device enables real scene occlusion by displayed virtual images in a compact form factor.
Enabling Future Fiber Networks Using Integrated Ultrafast Laser-Written Multicore Fiber Fan-outs
Authors: Ross-Adams Andrew , Gross Simon , Puttnam Benjamin J. , Luís Ruben S. , Rademacher Georg , Withford Michael J.
Published: October 2020

Ongoing increase in the demand for data capacity has driven the development of novel optical fibers. These fibers are leveraged using ultrafast laser inscribed 3D waveguide circuits, enabling next generation data transmission throughput.
All polarization-maintaining Er:fiber frequency comb based on nonlinear amplifying loop mirror
Authors: Li Mingkun , Ning Kai , Hou Lei , Yan Lulu , Zhang Yanyan , Rao Bingjie , Zhang Pan , Jiang Haifeng
Published: October 2020

An all polarization-maintaining Er:fiber frequency comb based on nonlinear amplifying loop mirror with 136-MHz repetition frequency is demonstrated. The in-loop instabilities of the repetition rate and carrier-envelope-offset frequency are 2.9x10-13 and 1.7x10-18 at 1 s respectively.
Experimental Observation of Internally-pumped Parametric Oscillation and Quadratic Comb Generation in a Lithium Niobate Microresonator
Authors: Hendry Ian , Trainor Luke S. , Xu Yiqing , Coen Stéphane , Murdoch Stuart G. , Schwefel Harald G. L. , Erkintalo Miro
Published: October 2020

We report on the experimental observation of internally-pumped optical parametric oscillation and initial stages of quadratic optical frequency comb generation in a lithium niobate microresonator under conditions of naturally phase-matched second-harmonic generation.
The nonlinear coefficient for lossy waveguides: which expression to use?
Authors: Tuniz Alessandro , Li Gordon H. Y. , de Sterke C. Martijn
Published: October 2020

We compare expressions for the nonlinear coefficient γ of several plasmonic waveguides against numerical methods. Using gold in its interband region as the metal, we identify the most accurate expression for y in lossy systems.
Femtosecond RMS timing jitter from 1 GHz InP on-chip mode-locked laser at 1550 nm
Authors: Alloush A. , Bassal A. , Brenner C. , Lo M. C. , Guzmán R. , Augustin L. , Carpintero G. , Hofmann M. R.
Published: October 2020

In this work, we analyze the timing stability of a 1 GHz InP on-chip monolithic mode-locked laser at 1550 nm. 504 fs RMS timing jitter is achieved by a hybrid mode-locking operation.
Three-Mode Switch Based on Electro-Optic Long-Period Gratings Integrated along a Lithium-Niobate Waveguide
Authors: Jin Wei , Chiang Kin Seng
Published: October 2020

We propose and demonstrate an optical switch to achieve complete switching functions for three spatial modes based on the structure of three cascaded electro-optic long-period gratings formed with graphene electrodes along a lithium-niobate waveguide.
Graphene-Coated Surface-Plasmon-Resonance Waveguide Biosensor
Authors: Mishra Satyendra Kumar , Zou Bing , Lor Kar Pong , Chiang Kin Seng
Published: October 2020

We propose a biosensor platform based on a graphene-coated surface-plasmon-resonance waveguide. As an example, we fabricate a sensor with a polymer waveguide for real-time detection of glucose, which shows an average sensitivity of 0.12 nm/(mg/dL).
Continuous Jitter Reconstruction of Dual-comb interferometer for self-referencing error correction
Authors: Yu Haoyang , Ni Kai , Zhou Qian , Li Xinghui , Wang Xiaohao , Wu Guanhao
Published: October 2020

We present a continuous jitter reconstruction method for self-referencing error correction of dual-comb interferometry. By utilizing specific interpolation and unwrap algorithm, continuous time jitter and phase jitter are correctly recovered from the simulated interferograms.
Suppressing Intrinsic Backscattering in Ultra-High-Q Optical Microresonators
Authors: Svela Andreas Ø. , Silver Jonathan M. , Del Bino Leonardo , Zhang Shuangyou , Woodley Michael T. M. , Vanner Michael M. , Del’Haye Pascal
Published: October 2020

We show > 30 dB suppression of intrinsic backscattering in ultra-high-quality factor whispering gallery mode resonators by controlling the position of a sub-wavelength scatterer within the evanescent field of the resonator.
Parametric wavelength conversion of 30Gbps NRZ data in ultra-silicon-rich nitride waveguides
Authors: Chen G. F. R. , Choi J. W. , Cao Y. M. , Ng D. K. T. , Tan D. T. H.
Published: October 2020

Parametric wavelength conversion of 30Gbps Non-Return-Zero data using degenerate four wave mixing was performed in ultra-silicon-rich nitride waveguides. A power penalty of 1.2dB was achieved at a bit error rate of 10-4.
High sensitivity measurement of thermal distortion in low-loss optical materials
Authors: Ingram Craig , Ng Sebastian W. S. , Cao Huy Tuong , Gambell Adam , Simakov Nikita , Brown Daniel D. , Ottaway David J. , Hemming Alexander , Veitch Peter J.
Published: October 2020

We describe a method for the measurement of surface and bulk absorption in low-loss optical materials. The measurement of bulk absorption at 2um in low-OH fused silica with ca. 1ppm/cm sensitivity is presented.
A Superstructure Microfiber Grating for Temperature, Strain, and Refractive Index Sensing
Authors: Zhi Yanyan , Li Xin , Li Yuanpeng , Li Jie , Guan Bai-Ou
Published: October 2020

A superstructure microfiber grating combined with microfiber Bragg grating and long-period microfiber grating is fabricated by ultraviolet laser inscription and femtosecond laser scratching techniques, providing a possible platform for simultaneous multi-parameter sensing.
A Universal Reconfigurable Waveguide Coupler for Optical Microcavities
Authors: Kim Dae-Gon , Han Sangyoon , Choi Duk-Yong , Lee Hansuek
Published: October 2020

We propose a universal, reconfigurable waveguide coupler designed to access optical microcavities easily. As the coupler can consist of any material, it can cover a wide range of refractive indices for phase-matching.
Tailored selective thermal emitter for efficient radiative cooling in humid climate
Authors: Kim Do Hyeon , Lee Gil Ju , Heo Se Yeon , Song Young Min
Published: October 2020

Combination of solar blocker and selective emitter enables efficient radiative cooling. Here, we propose a strongly selective emitter to achieve high cooling performance in both dry and humid condition.
Application Study of Clipping and Digital Resolution Enhancer for Low-Resolution High-Speed IM/DD PAM4 Transmission
Authors: Shu Liang , Yu Zhenming , Wan Zhiquan , Xu Kun
Published: October 2020

The performance of clipping and digital resolution enhancer (DRE) has been studied numerically in 56-GBaud IM/DD PAM4 systems. Significant OSNR performance improvement can be obtained in low-resolution IM/DD PAM4 systems by combing clipping and DRE.
All-Fiber CPA Toward High Peak Power fs Pulses at 1875nm Using Normal Dispersion Tm Fiber
Authors: Chen Yuhao , Chen Shaoxiang , Liu Kun , Siddharthan Raghuraman , Wang Qijie , Tang Dingyuan , Yoo Seongwoo
Published: October 2020

All-fiber based chirped-pulse-amplification enabled by Normal Dispersion Thulium Fiber (NDTF). Soliton pulses at 1875nm are stretched in a highly-nonlinear fiber, amplified through the NDTF, and compressed in telecom fiber from 3.3ps to 309fs.
Microfiber Controlled Bidirectional Wavelength-tunable Mode-locked Fiber Laser Based on Carbon Nanotubes
Authors: Dai Lilong , Huang Zinan , Huang Qianqian , Alaraimi Mohammed , Rozhin Aleksey , Luo Zhi-Chao , Mou Chengbo
Published: October 2020

We have demonstrated a bidirectional wavelength-tunable mode-locked fiber laser. The wavelength can be continuously tuned from 1567.3 to 1561.21 nm in the clockwise direction and from 1567.25 to 1561.19 nm in the counter-clockwise direction.
Low NA Ge-Clad Step-Index Yb-Doped Fiber for High Power Picosecond Laser Pulses
Authors: Sidharthan R. , Lin D. , Lim K. J. , Li H. , Lim S. H. , Chang C. J. , Jung Y. , Seng Y. M. , Chua S. L. , Richardson D. J. , Yoo S.
Published: October 2020

We report short absorption length LMA Yb-doped fiber with a low NA (0.04) and the amplification of 190ps pulses to 101µJ pulse energy with 150W average power and >70% slope efficiency using only 0.8 m of the fiber.
Real-time observation of the intracavity spectral evolution of mode-locked fiber laser
Authors: Lei Zihui , Chen Liao , Zhang Guangbo , Zhang Chi , Zhang Xinliang
Published: October 2020

Intracavity spectral evolution of mode-locked fiber laser is observed in real time, using three-channel dispersive Fourier transformation from different positions of the cavity, and intracavity dynamics are observed during the transient state of mode-locking.
Sub-pulses with L-shaped amplitude distribution in a rectangular-shaped noise-like pulses fiber laser
Authors: Zhou Renlai , Li Qian , Fu H. Y.
Published: October 2020

We experimentally present a novel type of sub-pulses with L-shaped amplitude distribution releasing from rectangular-shaped noise-like pulses (NLPs) in a passively mode-locked fiber laser, which helps understand the dynamics of NLPs in the fiber laser.
Grapefruit Photonic Crystal Fiber-Based Plasmonic Sensor for Multi-Analyte Detection
Authors: Haider Firoz , Aoni Rifat Ahmmed , Ahmed Rajib , Mahdiraji Ghafour Amouzad , Azman Mohd Fahmi
Published: October 2020

We propose a grapefruit fiber based mode-multiplex plasmonic sensor to detect three different analytes simultaneously. The proposed sensor shows the maximum wavelength sensitivity of 2000, 3000 nm/RIU for x-polarized and 18000 nm/RIU for y-polarized modes, respectively.
High-Pressure Gas Measurement Using Time-Resolved Rotational CARS with Temporally Asymmetric Pulses
Authors: Iwata Katsuya , Saito Yoichi , Ito Terumasa , Obara Yuki , Kameda Masaharu , Misawa Kazuhiko
Published: October 2020

We demonstrate the feasibility of rotational CARS measurements for evaluation of gas pressure using asymmetrically shaped pulses. It enables us to remove nonresonant background and to obtain the relaxation time of CARS signals under high-pressure.
Localized surface plasmons excited by skew rays
Authors: Wang Jinyu , Chen George Y. , Wu Xuan , Xu Haolan , Monro Tanya M. , Liu Tongyu , Lancaster David G.
Published: October 2020

A sensing platform transforming a light sheet into skew rays then localized surface plasmon resonances is presented, enabling giant enhancement in evanescent-wave-based chemical sensing in optical fiber.
Wide-Range and Modulation-Format-Transparent IQ Imbalance Estimation of Dual-Polarization Optical Transceiver
Authors: Gu Chao , Zhang Qun , Yang Yanfu , Yao Yong
Published: October 2020

We proposed a transceiver IQ imbalance estimation scheme, which can separate and monitor DP transmitter and receiver imbalances. The simulation results show the proposed scheme can achieve modulation-format-transparent transceiver imbalance estimation in a wide range.
Digital Chromatic Dispersion Pre-compensation Using a Quasi-Linear Double-Side Electro-Absorption Modulated Laser (DS-EML)
Authors: Sun Mingwei , Huo Jiahao , Huangfu Wei , Long Keping , Zhou Xian
Published: October 2020

A quasi-linear transmitter is proposed based on the double-side electro-absorption modulated laser (DS-EML). Using the proposed transmitter, 112 Gb/s chromatic dispersion (CD) pre-compensation PAM4 signal transmission over 320 km has been realized by simulation.
Effects of 3D Printed Preform Annealing on Structural and Optical Properties of Fibers
Authors: Koraganji Veda Narayana , de Lima Camila Faccini , Zheng Mengxin , Kurtoglu Merve Gokce , Gumennik Alexander
Published: October 2020

Additive manufacturing of fiber preforms enables greater flexibility on fiber cross-sectional geometry. We compare the optical properties and geometry preservation of fibers drawn from 3D-printed preforms both annealed and non-annealed before the draw process.
Angular Random Walk Improvement of Resonant Fiber Optic Gyroscopes
Authors: Liu Lu , Li Hanzhao , Tu Junyu , Lin Yi , Qian Weiwen , Ma Huilian
Published: October 2020

An angular random walk of 0.0021°/√h is experimentally demonstrated over a resonant fiber optic gyroscope employing a semiconductor laser as the light source and a 29 m-long fiber ring resonator as the rotation-rate sensing element.
Multiple-State Thermally Tunable Metasurfaces
Authors: Kamali Khosro Zangeneh , Yu Yu , Xu Lei , Miroshnichenko Andrey E. , Neshev Dragomir , Rahmani Mohsen
Published: October 2020

We propose dielectric metasurfaces to achieve reversible image tuning. We have demonstrated that by controlling the temperature of a metasurface, the encoded transmission pattern can be tuned dynamically.
Fabrication of High-Q Photonic Crystal Cavities with a Bosch Etch Process
Authors: Wu Jingda , Awan Kashif Masud , Li Yanrong , Chrostowski Lukas , Young Jeff F.
Published: October 2020

Photonic crystal cavities on silicon-on-insulator wafers with quality factors at 70,000 level were demonstrated using a Bosch etch process, with near-vertical sidewalls.
Photonic Crystal Microring Resonator Sensor based on Narrowband Microwave Photonic Filtering Technique
Authors: Wang Jianfu , Li Liwei , Wang Yunjie , Tian Xiaoyi , Nguyen Linh , Yi Xiaoke
Published: October 2020

We demonstrate an integrated photonic crystal microring resonator sensor incorporating microwave photonic filtering technique. The results show 114-fold improvement in the resolution for temperature sensing and 50 dB notch rejection enhancement for magnetic field detection. © 2020 The Authors
A Multi-functional radar waveform generator based on an optical frequency shifting loop and an optical wavelength generator
Authors: Liu Ce , Shao Kunlin , Zhang Yamei , Pan Shilong
Published: October 2020

A photonic method for multi-functional radar waveform generation is proposed and demonstrated using an optical frequency shifting loop and an optical wavelength generator. Frequency-stepped, single-chirped, dual-chirped, and dual-band linear-frequency modulated waveforms are generated.
Triple-Tip Spot Size Converter for Broadband, Polarization-Insensitive and Efficient Fiber-to-Chip Edge Coupling
Authors: Yao Zijun , Wan Yuhang , Zhao Xin , Zhang Yu , Ma Xinxuan , Zheng Zheng
Published: October 2020

We propose a triple-tip spot size converter to further optimize bandwidth and efficiency for edge fiber-to-chip coupling with much improved polarization sensitivity for thick silicon nitride waveguide. It also has good fabrication/assembly error tolerance.
Diamond in fibre magnetometry: understanding the effects of step-index fibre design on dipole coupling
Authors: Li Shuo , Bai Dongbi , Greentree Andrew D. , Foster Scott , Ebendorff-Heidepriem Heike , Afshar Shahraam , Gibson Brant C.
Published: October 2020

Hybrid diamond-fibre systems are interesting as robust platforms for magnetometry. Here we model the coupling between diamond fluorescent emitters and guided fibre modes for three core-cladding ratios, and varying core diameter to inform our experimental investigations.
Optical waveguide fabrication for the mid-infrared in fluorophosphate glasses
Authors: Rehman Sobia , Fernandez Toney Teddy , Gross Simon , Fuerbach Alex
Published: October 2020

A systematic parameter study into the inscription of optical waveguides into the mid-infrared compatible fluorophosphate glass N-FK58 is presented. Results show that the fabrication of structures with high numerical aperture is feasible in this material.
Photonic chip-based resonant supercontinuum generation with intrinsic nonlinear filtering
Authors: Anderson Miles , Bouchand Romain , Liu Junqiu , Weng Wenle , Obrzud Ewelina , Herr Tobias , Kippenberg Tobias J.
Published: October 2020

We demonstrate broadband soliton-based resonant supercontinuum generation in a chip-based microresonator. We show that the soliton possesses an intrinsic ability to filter RF noise transfer from the input pulses, which can be further improved with asynchronous driving. © 2020 The Author(s)
MHz-Repetition-Rate Yb:YAG Thin-Disk Ring Oscillator Pumped by 969nm Zero-Phonon-Line for Intra-Cavity High Harmonic Generation
Authors: Tanabashi Akihiro , Eilanlou A. Amani , Kanda Natsuki , Nabekawa Yasuo , Kuwata-Gonokami Makoto , Midorikawa Katsumi
Published: October 2020

We developed a high power storage ring oscillator using a Yb:YAG thin-disk gain medium pumped with 969nm absorption line. The intra-cavity average and peak power of 1kW and 200MW were attained, respectively at 14MHz operation. © 2020 The Author(s)
Photon-pair generation via bound states in the continuum in nonlinear metasurfaces
Authors: Parry Matthew , Mazzanti Andrea , Poddubny Alexander , Xu Lei , Miroshnichenko Andrey , Valle Giuseppe Della , Neshev Dragomir N. , Sukhorukov Andrey A.
Published: October 2020

We present a novel nonlinear metasurface featuring reconfigurable symmetry protected bound states in the continuum. It enhances photon-pair generation at non-degenerate photon frequencies via spontaneous parametric down-conversion, opening new opportunities for quantum spectroscopy and sensing.
Subpicosecond All-Optical Switching of 1550 nm Signals in Hybrid Silicon:VO2 Waveguides and Ring Resonators
Authors: Hallman Kent , Miller Kevin , Baydin Andrey , Weiss Sharon , Haglund Richard
Published: October 2020

We demonstrate all-optical, subpicosecond switching in silicon photonics devices, using the femtosecond insulator-to-metal transition in vanadium dioxide as the driving mechanism for an in-waveguide modulator, and very low switching thresholds in a hybrid ring resonator.
Modelling efficient Superconducting nanowire single photon detectors for Mid wave infrared photons
Authors: Slater Benjamin , Johnson Mack , Sahin Dondu
Published: October 2020

In quantum optics, loss of a single photon is irreplaceable quantum information destroyed. Simulations of waveguide cavity superconducting nanowire single photon detectors at mid-wave infrared wavelengths present near unity efficiencies and state-of-the-art jitter times.
10kW-level Yb-doped Aluminophosphosilicate Fiber
Authors: Dai Jiang Yun , Li Feng Yun , Liu Nian , Shen Changle , Zhang Lihua , Li Hao , Li Yue , Sun Shihao , Li Yuwei , Lv Jiakun , Jiang Lei , He Honglei , Lin HongHuan , Wang Jianjun , Jing Feng , Gao Cong
Published: October 2020

We fabricated and reported on an Yb-doped aluminophosphosilicate fiber for tandem pumping scheme by 1018nm fiber laser. 9.82 kW laser output at 1080 nm with an optical-to-optical efficiency of 86.8% was achieved with this fiber amplifier.
Progress Towards High Power Scaling of Ho:YAG Lasers
Authors: Ganija Miftar , Hemming Alexander , Boyd Keiron , Gambell Adam , Simakov Nikita
Published: October 2020

We have investigated the power scaling of a Ho:YAG laser at room temperature. The laser is in-band pumped by two 1907 nm Tm-fiber lasers. A near confocal resonator design allows for 142 W power extraction.
Cost Efficient Layout for a 20 fs, 2 mJ Compact Laser Operating at 100 Hz
Authors: Mackonis Paulius , Rodin Aleksej M. , Petrulenas Augustinas , Girdauskas Vytenis
Published: October 2020

We present a compact and cost-efficient laser containing a Yb:YAG DPSS pumping source and supercontinuum seeded NOPCPA providing output pulses of 20 fs, 2.1 mJ at 100 Hz with a beam quality of M
2
< 1.3.
3D mechanical mapping of bioprinted hydrogel models by Brillouin microscopy
Authors: Mahmodi Hadi , Piloni Alberto , Utama Robert , Kabakova Irina
Published: October 2020

We apply Brillouin microscopy to characterize micromechanical properties of 3D bioprinted hydrogel constructs. Non-contact and label-free mapping of constructs’ mechanical properties in situ provides invaluable insight into spatial distribution and swelling behavior of hydrogels.
Broadband Achromatic Printed-Circuit Metasurfaces
Authors: Fathnan Ashif. A. , Powell David A.
Published: October 2020

We develop broadband achromatic metasurfaces suited for microwave frequencies, by tailoring LC resonances in series and parallel configurations. We present a synthesis method for a transmissive metasurface and discuss limits on their realizable bandwidth.
Dielectric Huygens Metagrating-Based Refractive Index Sensor
Authors: Aoni Rifat Ahmmed , Manjunath Shridhar , Yu Yu , Rahmani Mohsen , Xu Lei , Miroshnichenko Andrey E. , Neshev Dragomir
Published: October 2020

We propose a novel concept for refractive-index optical sensing with enhanced sensitivity and robustness to source intensity. The design is based on dielectric Huygens’ metagratings and shows 26 times higher sensitivity than conventional blazed gratings. © 2020 The Author(s) OCIS codes: (280.4788) Optical sensing and sensors; (350.4238) Nanophotonics and photonic crystals.
On-Chip All-Optical Polarisation Pulling via Stimulated Brillouin Scattering
Authors: Athanasios Nicholas J. , Yan Kunlun , Vu Khu , Choi Duk-Yong , Ma Pan , Madden Stephen J. , Eggleton Benjamin J. , Merklein. Moritz
Published: October 2020

We demonstrate a tunable on-chip all-optical polarisation controller based on Polarisation Pulling via Stimulated Brillouin Scattering, achieving near-complete rotations between orthogonal linear polarisation states.
Experimental Investigation of Topological Phases of Two-Dimensional Floquet Microring Lattices
Authors: Afzal Shirin , Zimmerling Tyler J. , Ren Yang , Perron David , Van Vien
Published: October 2020

We experimentally investigated various topological phases of Floquet topological insulatore based on 2D coupled octagonal resonators, verifying that the lattice can behave as normal, Chern, or Anomalous Floquet insulator depending on the lattice coupling strengths.
Influence of the Saturable Absorber Recovery Time on Fiber Laser Mode-Locking
Authors: Lee Jinho , Kwon Suhyoung , Lee Ju Han
Published: October 2020

We investigate the recovery-time impact of a saturable-absorber on mode-locking performance of a fiber laser. The recovery-time was found to have a significant impact in a fiber cavity with normal GVD rather than anomalous GVD.
Femtosecond-Laser-Induced Graphitic Carbon from Transparent Cellulose Nanofiber Films
Authors: Morosawa F. , Hayashi S. , Terakawa M.
Published: October 2020

The fabrication of electrically conductive structures by femtosecond-laser irradiation of a cellulose nanofiber (CNF) film was demonstrated. Raman analyses indicated the formation of graphitic carbon, which is attributable to the electrical conductivity of the structures.
Characteristics of Ti:Sapphire Laser Pumped by 450-nm Blue Diode Laser at Cryogenic Temperatures
Authors: Shioya Yuta , Fujita Shogo , Kannari Fumihiko
Published: October 2020

We experimentally examine the characteristics of a continuous wave Ti:sapphire laser pumped by a 449-nm diode-laser at cryogenic temperatures, including the temperature dependence of the pump laser absorption and the fluorescence efficiency.
Femtosecond laser written point-by-point Bragg gratings in few-mode optical fibre
Authors: Bhardwaj Saurabh , Ams Martin , Gross Simon , Withford Michael J. , Steel Michael J.
Published: October 2020

We report the fabrication of femtosecond laser inscribed point-by-point Bragg grating in a few-mode optical fibre. We show how the flexibility of this fabrication technique is used to control the mode coupling of the grating.
Quasi-symmetric angular spin Hall effect of a circularly polarized beam reflected from air-gold interface
Authors: Chen Ze , Zhang Hu , Zhang Xiaoguang , Li Hui , Zhang Wenbo , Xi Lixia
Published: October 2020

The quasi-symmetric angular spin Hall effect (ASHE) of a circularly polarized beam is revealed. The result could be applied potentially to nanoprobing and edge-enhanced imaging.
Corrugated Gold Layered Integrated Planar Waveguide Surface Plasmon Polariton Based Microbiosensor
Authors: Aruna Gandhi M. S. , Li Qian
Published: October 2020

Sensing performances of the self-referenced plasmonic sensor are investigated in this work. The highest sensitivity of 38000 nm/RIU with figure-of-merit 470 in the analyte refractive-index from 1.44 to 1.45 for the chemical and biological applications.