bluuebunny/crossref_metadata_2025 huggingface dataset:
Quantum Key Distribution Using Time-Gated SPADs over Turbid Underwater Channels
Authors: Jiang Shuangfeng , Popoola Wasiu O. , Safari Majid
Published: August 2021

We investigate the optimisation of gate time period for single-photon detectors in an underwater quantum key distribution system. We explore the trade-off between received background and encoded photons to achieve minimum quantum bit error rate.
Transmission Asymmetry in Nano-opto-mechanical Metamaterials
Authors: Li Jinxiang , MacDonald Kevin F. , Zheludev Nikolay I.
Published: August 2021

In linear optics, the transmission of (conventional) absorbers is identical in the forward and backward propagation directions. We have developed a nonlinear metamaterial providing intensity-dependent transmission asymmetry of up to 60% at microwatt power levels.
Self-Pulsing in Coupled Kerr Ring Resonators
Authors: Yelo-Sarrión Jesús , Parra-Rivas Pedro , Englebert Nicolas , Mas-Arabí Carlos , Leo François , Gorza Simon-Pierre
Published: August 2021

Self-pulsing is an ubiquitous phenomenon arising in coupled nonlinear systems. We here experimentally study the self-pulsing dynamics occurring in two coupled fiber ring resonators. Our results are supported and extended by a detailed bifurcation analysis.
Quantum Absorption Estimation for Saturable Samples
Authors: Biele Jake , Silverstone Joshua W. , Matthews Jonathan. C. F. , Allen Euan J.
Published: August 2021

We model the effect of saturation in absorption spectroscopy on quantum and classical probe performance. We derive a bound on the precision for each strategy, presenting an ideal quantum probe alongside methods to maximise precision classically.
Thrombin Detection on Ball Resonator Using Optical Backscatter Reflectometry
Authors: Shaimerdenova Madina , Ayupova Takhmina , Sypabekova Marzhan , Tosi Daniele
Published: August 2021

We detected thrombin protein on a ball resonator using optical backscatter reflectometer. The sensor was fabricated with CO2 laser splicing system, gold-sputtered, and functionalized for thrombin concentration dependency measurement. A linear trend was observed.
Mechanism and sensitivity of Fano resonance tuning in high-contrast gratings
Authors: Yao Hsin Yu , Her Tsing-Hua
Published: August 2021

An analytical theory for Fano resonance tuning in high-contrast gratings (HCGs) is developed, agreeing well with numerical modeling. We show HCG resonance tuning contains cooperative contribution from two modes, different from single-mode microresonators.
Magnetically Tunable Goos-Hanchen Shifts in Topological Quantum Materials
Authors: Shah Muzamil , Shah Mudasir , Akbar Ali
Published: August 2021

We theoretically investigate the Goos-Hanchen (GH) shifts on the surface of a topological insulator (TI) thin film in the presence of an externally applied magnetic field. The potential applications are in optical heterodyne and bio-sensors.
Switchable polarization eigenstates in non-Hermitian plasmonic systems with phase change materials
Authors: Moritake Yuto , Notomi Masaya
Published: August 2021

We propose and numerically demonstrate reconfigurable non-Hermitian plasmonic systems loaded by phase-change materials. This system enables switching of unique polarization properties around exceptional points resulting from PT transition induced by the material phase transition.
Electro-optical Modulation in Lithium Niobate Metasurfaces
Authors: Gao Bofeng , Ren Mengxin , Wu Wei , Xu Jingjun
Published: August 2021

We fabricated lithium niobate electro-optic metasurfaces and experimentally demonstrate the electro-optical phase modulation in LN metasurfaces using the optical heterodyne interference technique.
Particle swarm optimization of SPM-enabled spectral selection to achieve octave-spanning wavelength shift
Authors: Diao Xincai , Chen Runzhi , Chang Guoqing
Published: August 2021

We apply particle swarm optimization algorithm to optimize SPM-enabled spectral selection (SESS) and demonstrate highly efficient SESS which delivers MW peak-power femtosecond pulses with the wavelength tuning range exceeding one octave.
Stability of Lithium Niobate Integrated Photonics in Nonlinear and Metrology Applications
Authors: Obrzud E. , Sattari H. , Voumard T. , Choong G. , Denis S. , Leo J. , Wildi T. , Dubochet O. , Despont M. , Lecomte S. , Herr T. , Ghadimi A. , Brasch V.
Published: August 2021

We demonstrate that lithium niobate integrated photonics allows for reliable nonlinear applications under continuous femtosecond laser irradiation. Over >100 hours, a stable octave-spanning supercontinuum plus second-harmonic generation allows for direct self-referencing of a frequency comb.
Engineering High-dimensional Entangled States via Discrete-time Quantum Walks
Authors: Giordani Taira , Suprano Alessia , Polino Emanuele , Spagnolo Nicolò , Sciarrino Fabio
Published: August 2021

Discrete-time quantum walks (QWs) are versatile platforms in quantum information. In this work we engineer QWs encoded in the angular momentum of single-photon states, to transfer and accumulate entanglement between information carriers of different dimensions.
Accurate profile design of parabolic SNAP structures fabricated with a femtosecond laser
Authors: Yu Qi , Zhang Zhen , Shu Xuewen
Published: August 2021

We demonstrate a new and powerful approach for fabricating the parabolic SNAP structures with a femtosecond laser by tailoring the length of the inscribed lines to match the parabolic profile.
High efficiency Silicon nitride gratings for fiber-chip coupling in 850-900 nm wavelength.
Authors: Nambiar Siddharth , Chatterjee Avijit , Selvaraja Shankar Kumar
Published: August 2021

We demonstrate high-efficiency Silicon Nitride gratings for fiber-chip coupling in 850-900 nm. Experimentally measured peak efficiency is -4.44 dB and -3.4 dB for uniform and apodized gratings, respectively.
All-fiber femtosecond visible vortex beam based on Cherenkov radiation
Authors: Zhou Xuan , Shi Fan , Lu Jiafeng , Zhu Jie , Liu Xiaomin , Zeng Xianglong
Published: August 2021

All-fiber femtosecond visible vortex beam generation is demonstrated by assembling nonlinear frequency conversion and mode selective coupler, which has found potential applications in super-resolution microscopic imaging, optical tweezers and Raman enhancement.
Stabilized Fast Light and Superluminal Propagation via Linearly Polarized Brillouin Lasing Oscillation
Authors: Xiao Zhelan , Qiu Zenghuan , Zhang Jilin , Xie Haoran , Jiang Yikun , Pang Fufei , Zhang Liang
Published: August 2021

We experimentally achieved stabilized Brillouin-induced fast light and superluminal propagation in kilometer-long optical fibers by introducing linearly polarized single-longitudinal-mode Stokes lasing resonance.
Double-Pulse Operation Enhances Brightness of Hybrid Perovskite Light Emitting Transistor
Authors: Klein Maciej , Cheng Bryan Wei Hao , Jia Li , Bruno Annalisa , Soci Cesare
Published: August 2021

We report enhancement of the brightness of hybrid perovskite light emitting transistors operated with independent pulsing of drain and gate bias voltages, attributed to compensation of space-charge effects and improved timing of carrier injection.
Soliton blockade and symmetry breaking in microresonators
Authors: Fan Zhiwei , Puzyrev Danila N. , Johansson Magnus , Skryabin Dmitry V.
Published: August 2021

We report new methods to control the soliton generation in ring microres-onators via the soliton blockade and symmetry breaking in the bidirectionally pumped and coupled ring systems.
Cantilever Edge Coupler for Lithium Niobate On Insulator Platform
Authors: Gao Shengqian , Chen Lifeng , Cai Xinlun
Published: August 2021

We demonstrate a CMOS compatible cantilever edge coupler design realizing efficient edge coupling for lithium niobate on insulator platform, experimental results show 1.7dB loss per facet.
SU(1,1) Interferometer by Direct Detection
Authors: Huo Nan , Guo Xueshi , Zhao Wen , Zhang Yunxiao , Li Xiaoying , Ou Z. Y.
Published: August 2021

We report an SU(1,1) interferometer with double injection and unit gain for precision phase measurement. This scheme can increase the phase probing intensity from nW to μW to improve absolute phase measurement sensitivity.
Self-referenced distribution of millimeter waves over 10km optical fiber with high frequency stability
Authors: Yu Chunlong , An Zhuoyan , Li Yihan , Guo Hao , Tong Hancheng , Zheng Zheng
Published: August 2021

We propose a photonic approach for the frequency-stabilized distribution of millimeter waves based on a self-referenced feedback control technique. The implementation is demonstrated over an optical fiber link of 10 km.
Performing Two-Dimensional Differentiation with Gap Plasmon-based Metasurface
Authors: Xu Chenyuan , Dagens Béatrice , Zhang Xinliang
Published: August 2021

We numerically demonstrate spatial differentiation using circular gap-plasmon resonators arranged in a square lattice. The metasurface enables ultrafast analog computing and two-dimensional edge detection for image processing.
Wide gamut, single-wafer, flexible structural coloration via wet chemistry with resolution beyond diffraction limit
Authors: Li Ning , Fratalocchi Andrea , Li N. , Fratalocchi A.
Published: August 2021

We demonstrate structural colors with gamut exceeding the red green and blue (RGB) spectrum, on inexpensive, metal-free, and thermal resistant structures with resolution of 127000 dots per inches (DPI) on 4-inch wafers beyond.
Reconfigurable topological edge state in valley photonic crystals
Authors: Liu Yang , Wang Jiayi , Hassan Faheem , Zhang Xinzheng , Xu Jingjun
Published: August 2021

A reconfigurable topological valley photonic crystal (RTVPC) is proposed. By adjusting the refractive index of liquid crystals via an external voltage applied between two parallel metal plates, and the reconfigurable topological boundary state can be achieved.
Red Blood Cell Storage Monitoring by High-throughput Single-bell Image-based Biophysical Profiling
Authors: Cheung Evelyn H. Y. , Siu Dickson M. D. , Lee Kelvin C. M. , Wong Kenneth K. Y. , Tsia Kevin K.
Published: August 2021

We demonstrate a label-free approach to monitoring the characteristics of stored red blood cells (RBCs), based on a large-scale single-cell morphological and biophysical profile of RBCs derived from high-throughput quantitative phase imaging flow cytometry (>10,000 cells/sec).
Bandgap Renormalization and Trap-Induced Absorption in MoWS2 Single-Crystal
Authors: Taank Pravrati , Adarsh K. V.
Published: August 2021

We studied many-body dynamics in MoWS2 single-crystal using time and energy-resolved reflection spectroscopy. We detected ultrafast bandgap renormalization, overwhelmed by trap-induced absorption (TIA) at longer timescale. Furthermore, non-decaying TIA caused formation of long-lived trapped exciton.
High-dimensional quantum cryptography based on multiplexing of polarized structured photons
Authors: Huang Shuang-Yin , Wang Zhou-Xiang , Wang Min , Tian Qian-Qian , Tu Chenghou , Li Yongnan , Wang Hui-Tian
Published: August 2021

We perform a proof-of-principle experiment of High-dimensional QKD based on multiplexing of different orders of polarized structured photons with 4D-BB84 protocol. The secret key rate per sifted photon is estimated about 2.604 bits.
Engineering spin-phonon coupling rates for the silicon vacancy center in diamond phononic crystal cavities
Authors: Chia Cleaven , Chalupnik Michelle , Lončar Marko
Published: August 2021

We design diamond phononic crystal cavities to couple GHz phonons to silicon vacancy center spin qubits, with coupling rates of 1.45-3.63 MHz that would enable strong coherent spin-phonon interactions at cryogenic temperature ~ 4K.
Nonlinear optical spintronics: topological Hall effect and Anderson localization
Authors: Karnieli Aviv , Tsesses Shai , Kaminer Ido , Bartal Guy , Arie Ady
Published: August 2021

We propose nonlinear optical systems that are analogous to spin-transport in magnetic materials. We find a topological Hall effect for light in skyrmionic nonlinear photonic crystals, and spin-Anderson localization in optical spin-glass.
Deep learning-based spectral reconstruction on a chip using a scalable plasmonic encoder
Authors: Goncharov Artem , Brown Calvin , Ballard Zachary , Fordham Mason , Clemens Ashley , Qiu Yunzhe , Rivenson Yair , Ozcan Aydogan
Published: August 2021

We demonstrate a deep learning-based spectroscopy framework using a low-cost on-chip plasmonic encoder. When blindly tested on N=14,648 random spectra our system shows competitive performance, where the reconstruction of an unknown spectrum on average takes ~28µs.
Polarization Entangled Photon Pairs with Factorable Spectra Engineered by Un-even Three-stage Nonlinear Interferometers
Authors: Gao Pengyu , Ma Mingyi , Cui Liang , Li Xiaoying
Published: August 2021

Polarization-entangled photon pairs with factorable spectra are generated by using a nonlinear interferometer, in which three nonlinear fibers with lengths following binomial distribution are sandwiched with two 10-m-long standard single mode fibers.
Nanoelectromechanical tuning of dual-mode resonant metasurfaces
Authors: Zheng Tianzhe , Kwon Hyounghan , Faraon Andrei
Published: August 2021

We demonstrate nanoelectromechanical tuning of dual-mode resonant dielectric metasurfaces. The devices achieve intensity modulation over 40%, > 10kHz speed, and 144° phase shift with 7V bias voltage.
Optical N-invariant of graphene’s viscous Hall fluid
Authors: Van Mechelen Todd , Jacob Zubin
Published: August 2021

We introduce a new topological classification of two-dimensional matter related to its optical properties. Graphene’s viscous Hall fluid is the first candidate of this topological electromagnetic phase of matter with the underlying physical mechanism being Hall viscosity.
Superconducting Nanowire Photon-Number-Resolving Detectors Integrated with Current Reservoirs and yTron Readouts
Authors: Zou Kai , Meng Yun , Xu Liang , Hu Nan , ZhaoWang  , Hu Xiaolong
Published: August 2021

We propose and design superconducting nanowire photon-number-resolving detectors integrated with current reservoirs and yTron readouts, which can resolve up to 11 photons with high fidelity.
Quantum detector tomography of high-dimensional multiplexed superconducting detectors
Authors: Schapeler Timon , Höpker Jan Philipp , Bartley Tim J.
Published: August 2021

We demonstrate quantum detector tomography of three different multiplexed SNSPDs, including a nonlinear detector of dimension > 103. We use this to extract efficiency, dark-count and cross-talk probability from just four elements of the reconstructed POVMs.
Field-based Design of a Resonant Dielectric Antenna for Coherent Spin-Photon Interfaces
Authors: Li Linsen , Choi Hyeongrak , Heuck Mikkel , Englund Dirk
Published: August 2021

We propose a field-based design of dielectric antennas interfacing diamond color centers with a 0.4 numerical aperture far-field Gaussian mode. This enables a highly efficient spin-photon interface with 93.2% mode overlap and 421 Purcell Factor.
A Study of Phonon Modes of Magnetic Two-dimensional Materials using Optical Spectroscopy
Authors: Kang J. H. , Cho Y. , Liang L. , Kong X. , Ghosh S. , Kargar F. , Hu C. , Balandin A. A. , Geohegan D. , Puretzky A. A. , Ni N. , Wong C. W.
Published: August 2021

Raman spectroscopy measuring phonon vibration modes of MnBi2nTe3n+1 (n=1,2) showed abnormal changes in linewidths of MnBi2Te4. Out-of-plane force constant was also estimated via Davydov splitting of A1g mode (136 cm-1) of MnBi4Te7.
Atomic Quantum Wires in Ising-spin Chain Models
Authors: Kim Minhyuk , Kim Kangheun , Ahn Jaewook
Published: August 2021

We implement quantum wires in Rydberg atom systems to program graph-connected Ising spins. With auxiliary atoms arranged in wires, we show that non-adjacent qubits are on-demand coupled for an Ising Hamiltonian of arbitrary graph connections.
Room temperature electrically pumped topological insulator laser based on quantum spin Hall effect
Authors: Choi Jae-Hyuck , Hayenga William E. , Liu Yuzhou G. N. , Parto Midya , Bahari Babak , Christodoulides Demetrios , Khajavikhan Mercedeh
Published: August 2021

We report the first room temperature and electrically pumped topological insulator laser. Based on a structure that mimics the quantum spin Hall Hamiltonian for photons, this laser generates single frequency emission at a telecom spectral band.
Quantum upper limit SERS from sub-1-nm random gaps for quantitative chemical and biological sensing
Authors: Zhang Nan , Singer Matthew , Li Kuang-hui , Zhou Lyu , Ooi Boon S. , Gan Qiaoqiang
Published: August 2021

We report a strategy to fabricate high-density random metallic nanopatterns with accurately controlled nanogaps defined by atomic-layer-deposition and self-assembled-monolayer processes for quantitative chemical and biological sensing with a record-high uniformity over a large area.
Imaging-based Optofluidic Biosensors Enabled by All-dielectric metasurfaces
Authors: Jahani Yasaman , Arvelo Eduardo R. , Yesilkoy Filiz , Koshelev Kirill , Cianciaruso Chiara , De Palma Michele , Kivshar Yuri , Altug Hatice
Published: August 2021

We present optofluidic label-free biosensors leveraging high
quality-factor resonances emanated from bound-states-in-the-continuum
and novel data processing. The sensors are based on imaging and offer
solutions to remove sophisticated spectroscopy instrumentations
towards point-of-care applications.
Review of thermal parameters of Li-based nonlinear crystals for high power 8 µm sources
Authors: Namboodiri Mahesh , Golz Torsten , Buß Jan H. , Schulz Michael , Riedel Robert , Laarmann T. , Prandolini Mark J.
Published: August 2021

A review of the thermal parameters of Li-based nonlinear crystals is presented and preliminary results demonstrate a 8 µm laser system with 2 µJ at 200 kHz supporting a Fourier limit of under 100 fs.
10 µm lasing in multi-atmosphere CO2 optically pumped by a tunable 4.3 µm laser
Authors: Tovey D. , Pigeon J. J. , Tochitsky S. Ya. , Louwrens G. , Ben-Zvi I. , Joshi C. , Martyshkin D. , Fedorov V. , Karki K. , Mirov S.
Published: August 2021

Lasing is studied in CO2 pumped at ~4.3 µm by a tunable Fe:ZnSe laser. Gain is measured at ~10 µm at pressures ≤12 atm where gain bandwidth is broad enough for potential picosecond pulse amplification.
Ultra-stable Laser System for Next-generation Light-pulse Atom Interferometry MAGIS-100
Authors: Giunta Michele , Brekenfeld Manuel , Bradler Maximilian , Schmidt Dag , Fricke Andreas , Lessing Maurice , Fischer Marc , Thom Joseph , Hempler Nils , Maker Gareth , Malcolm Graeme , Kovachy Tim , Hogan Jason , Holzwarth Ronald
Published: August 2021

We present a fully phase-locked comb-disciplined-laser system, conceived to operate the Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS-100). Via phase-locking to the comb, four ECDLs and a Ti:Sapphire laser inherit the stability of an ultra-stable laser.
Chip scale optical pumping using atomic cladded tapered nano waveguides with buffer gas
Authors: Zektzer Roy , Talker Eliran , Mazurski Noa , Barash Yefim , levy Uriel
Published: August 2021

We experimentally demonstrate chip-scale optical pumping of Rubidium vapor based on novel atomic-cladded tapered nano-waveguides with different buffer-gas pressures. Precise control over the interaction volume and coupling enables the optimization of the atomic polarization.
Differential Spectroscopy of Atomic Clocks for Improved Measurement Instability
Authors: Nardelli N. V. , Zhang X. , Clements E. R. , Kim M. , Hassan Y. S. , McGrew W. F. , Beloy K. , Ludlow A. , Leibrandt D. R. , Hume D. H. , Fortier T. M.
Published: August 2021

Using frequency comb mediated phase-coherent and synchronous clock comparisons we demonstrate close to a factor of 10 improvement in short-term measurement instability, σy(τ) < 2 x 10-16 @ 1s averaging, between 171Yb and 27Al+ optical clocks.
Versatile micro-fabricated mirrors with finesse >700,000
Authors: Hendrie James P. , Jin Naijun , McLemore Charles A. , Luo Yizhi , Kelleher Megan , Mason David , Kharel Prashanta , Quinlan Franklyn , Rakich Peter , Diddams Scott A.
Published: August 2021

We introduce a micro-fabrication technique for high-finesse optical mirrors based on reflow and smooth reactive ion etch. These mirrors support >700,000 finesse with surface losses constrained to ~1.2 ppm.
1 MHz, few-cycle, CEP stable OPCPA with dual channel output at 800 nm and 2 µm wavelength
Authors: Braatz Thomas , Starosielec Sebastian , Zapolnova Ekatarina , Golz Torsten , Grguraš Ivanka , Buss Jan Heye , Schulz Michael , Riedel Robert
Published: August 2021

A high repetition rate, optical parametric chirped-pulse amplifier (OPCPA) with dual output at 800 nm and 2 µm is presented. White light seeded, CEP stabilized pulses with 9.1 fs are achieved on less than a square-meter footprint.
Generation of 95 fs mid-IR pulses with 1.8 W average power using an Er: ZrF4 fiber mode-locked oscillator and a nonlinear amplifier
Authors: Cui Yifan , Du Weizhi , Chen Mingshu , Galvanauskas Almantas
Published: August 2021

Ultrashort mid-IR pulse train with 95 fs pulse width, 37.4 nJ pulse energy and 1.8 W average power was generated at ~2.85 µm from a simple Er:ZrF4 fiber nonlinear amplifier seeded by a mode-locked oscillator.
Extended Depth of Focus Metalenses for Achromatic Computational Imaging
Authors: Huang Luocheng , Whitehead James , Colburn Shane , Majumdar Arka
Published: August 2021

We demonstrate high-quality, full-color imaging using extended depth of focus (EDOF) metalenses and computational reconstruction. We use rotationally symmetrical phase masks to mitigate asymmetrical artifacts found in the traditional cubic EDOF systems.
Four-Octave-Spanning Mid-Infrared Supercontinuum Generation in a Gas-Filled Hollow-Core Fiber
Authors: Deng Ang , Gavara Trivikramarao , Hassan Muhammad Rosdi Abu , Jin Yuhao , Wang Qi Jie , Chang Wonkeun
Published: August 2021

We demonstrate the generation of multi-octave-spanning supercontinuum in a gas-filled hollow-core fiber that extends into the mid-infrared. This is achieved by pumping the system with high-energy ultrashort pulses centered at 2 µm wavelength.
Soliton self-frequency shift in a passive silica fiber with conversion efficiency of 84.6%
Authors: Shamim Md Hosne Mobarok , Alamgir Imtiaz , Rochette Martin
Published: August 2021

We demonstrate the highest energy conversion efficiency of 84.6% from a soliton self-frequency shift system based on a passive silica fiber. The soliton is tunable over 310 nm in the spectral range 1.96-2.27 µm.
Characteristics of Spectral Peaking in Coherent Supercontinuum Generation
Authors: Nishizawa Norihiko , Yamanaka Masahito
Published: August 2021

Spectral peaking during supercontinuum generation in normal dispersive highly nonlinear fiber was investigated both numerically and experimentally. Sharp multiple spectral peaks were generated stably with 290 GHz frequency interval, and low noise properties were confirmed.
Thermal Properties of the Trigonal Quaternary Nonlinear Crystals BaGa2GeS6 and BaGa2GeSe6
Authors: Wei Jean , Murray Joel , Badikov Valeriy V. , Petrov Valentin , Guha Shekhar
Published: August 2021

The uniaxial nonlinear crystals BaGa2GeS6 and BaGa2GeSe6 are characterized in terms of thermal diffusivity and specific heat over a temperature range of -90 to 250 °C for heat propagation along and perpendicular to the c-axis.
Optical Properties of the Refractory Metals at High Temperatures
Authors: Chirumamilla Manohar , Arya Mahima , Ganguly Ankita , Rout Surya Snata , Krishnamurthy Gnanavel V. , Krekeler Tobias , Ritter Martin , Störmer Michael , Petrov Alexander Yu , Eich Manfred
Published: August 2021

We measure and compare the optical properties of thin refractory metal films (TiN, W, Mo and Ir) at temperatures up to 1000 °C. In-situ ellipsometry is used to measure the optical constants. Refractory metals show long-term structural stability at 1000 °C for 120 h.
Survey of metal oxides for coatings of ultra-stable optical cavities
Authors: Menoni Carmen S. , Yang Le , Fazio Mariana , Vajente Gabriele , Ananyeva Alena , Billingsley GariLynn , Schiettekatte François , Chicoine Martin , Markosyan Ashot , Bassiri Riccardo , Fejer Martin M.
Published: August 2021

A survey of the optical properties and mechanical loss of metal-oxide thin films is reported in a search for optimum materials for mirror coatings for gravitational wave detectors. Ta2O5 and GeO2 doped with TiO2 achieve the lowest absorption and mechanical loss with post-processing annealing.
Enhanced random lasing performance of CH3NH3PbI3 perovskite in AgI configuration
Authors: Kao Tsung Sheng , Hong Yu-Heng , Huang Zhi-Wei , Ahn Hyeyoung
Published: August 2021

We demonstrate that the random lasing behavior of solution-processed MAPbI
3
perovskites can be improved around 3 times in light intensity enhancement and pumping threshold reduction with the existence of AgI configuration.
Femtosecond Tunable Light Source with Variable Repetition Rate and Ultra-high Pulse Contrast Ratio
Authors: Floess Moritz , Steinle Tobias , Gerhardt Ilja , Giessen Harald
Published: August 2021

We demonstrate a novel femtosecond tunable light source based on a synchronously pumped fiber-feedback optical parametric oscillator with variable pulse repetition rate from 640 kHz to 41 MHz with 82 dB temporal pulse contrast ratio.
>30 dB Suppression of Intrinsic Backscattering in Whispering-Gallery-Mode Microresonators
Authors: Svela Andreas Ø. , Silver Jonathan M. , Bino Leonardo Del , Zhang Shuangyou , Woodley Michael T. M. , Vanner Michael R. , Del'Haye Pascal
Published: August 2021

We demonstrate a technique for suppressing backscattered light in a whispering-gallery-mode resonator by positioning a sub-wavelength-size scatterer within its evanescent field, achieving at least 34 dB suppression compared to the intrinsic backscattering.
Generation of Multiple Sharp Fano Resonances based on a Silicon Nanobeam-Microring Resonator
Authors: Zhang Ruihuan , He Yu , Zhang Yong , Su Yikai
Published: August 2021

A silicon nanobeam-microring resonator is experimentally demonstrated to generate periodic multiple sharp Fano resonances with an FSR of 8.44 nm. The extinction ratios of the Fano resonances are higher than 11 dB.
Enhanced Bio-Photocurrent Generation via Light-Harvesting Protein Microcavity
Authors: Yuan Zhiyi , Cheng Xin , Li Tsungyu , Chen Yu-Cheng
Published: August 2021

Biological produced photoelectricity was first enhanced through light-harvesting protein microcavity assemblies. Detailed study between optical resonance and photoelectricity reveals the huge potential of optical cavity in light-harvesting and photon conversions.
Neuron-like spiking derived from silicon-based photonic crystal microcavity
Authors: Deng Yang , Flor Flores Jaime G. , Wang Zehao , yuan Huan , Zhang Jinping , Wu Jiagui , Wong Chee Wei
Published: August 2021

We propose a method for neuron-like spiking generation using silicon microcavities, where the spiking speed is about 4 nanosecond and a million times faster than biological neurons. Both experiments and theories were carried out.
A 5 Gb/s monolithically integrated InP SOA-based bistable photonic waveguide memory
Authors: Moschos T. , Pappas C. , Mourgias-Alexandris G. , Alexoudi T. , Vagionas C. , Miliou A. , Pleros N.
Published: August 2021

We experimentally demonstrate for the first time a simple bistable monolithic integrated InP photonic memory relying on two semiconductor optical amplifiers with traveling waveguide configuration. Proof of principle operation is presented at 5 Gb/s.
All-Mid-Infrared Stabilized Quantum Cascade Laser Frequency Comb with 30-kHz Frequency Stability at 7.7 μm
Authors: Komagata K. , Shehzad A. , Hamrouni M. , Jouy P. , Kapsalidis F. , Shahmohammadi M. , Beck M. , Matthey R. , Wittwer V. J. , Faist J. , Südmeyer T. , Hugi A. , Schilt S.
Published: August 2021

High-resolution spectroscopy in the mid-infrared requires stable frequency references. A frequency comb emitted by a quantum cascade laser is locked to a molecular transition, demonstrating 30-kHz frequency stability up to 5000-s integration time.
Full Mid-Infrared Characterization of InGaSb SESAMs
Authors: Heidrich J. , Gaulke M. , Alaydin B.O. , Golling M. , Barh A. , Keller U.
Published: August 2021

We present high-precision (<0.04%) nonlinear reflectivity and pump-probe setups to characterize mid-infrared InGaSb quantum-well-based SESAMs at 2.05 pm. The SESAMs show modulation depths between 1-2.2%, low saturation fluences, low non-saturable losses and fast recovery times.
Stability performance of active gas-filled hollow-core antiresonant fiber lasers
Authors: Wang Yazhou , Adamu Abubakar I. , Dasa Manoj K. , Antonio-Lopez J. E. , Habib Md. Selim , Amezcua-Correa Rodrigo , Bang Ole , Markos Christos
Published: August 2021

The stability of infrared gas-filled fiber Raman lasers is investigated for the first time. It reveals that high pulse energy leads to low noise, while the associated high heat release compromises the laser's long-term stability.
Optical metrology for gravitational wave observatories and geophysics
Authors: Guzman Felipe
Published: August 2021

Decades of efforts by the scientific community in advancing optical metrology enable unprecedented displacement sensitivities that make our scientific endeavors possi- ble. Examples from the gravitational-wave and geodesy communities are briefly presented in this paper.
Demonstration of Flexible DUV Light Emitting Diodes through Formation of Nanowires with Inverse-Taper
Authors: Melanson Bryan , Hartensveld Matthew , Liu Cheng , Zhang Jing
Published: August 2021

AlGaN nanowires with a novel “inverse taper” profile were fabricated and shown to allow for high-yield liftoff of nanowire arrays in a flexible medium, allowing for creation of flexible nanowire LEDs emitting at 270 nm.
On-chip erbium-doped lithium-niobate microring lasers
Authors: Luo Qiang , Yang Chen , Zhang Ru , Hao Zhenzhong , Zheng Dahuai , Liu Hongde , Liu Shiguo , Bo Fang , Kong Yongfa , Zhang Guoquan , Xu Jingjun
Published: August 2021

1550-nm continuous lasers with ∼20 µW threshold and stable performance were realized in erbium-doped integrated lithium niobate microrings with loaded quality factors higher than one million.
Emergence of Laser Cavity-Solitons in a Microresonator-Filtered Fiber Laser
Authors: Rowley Maxwell , Hanzard Pierre Henry , Cutrona Antonio , Chu Sai T. , Little Brent E. , Morandotti Roberto , Moss David J. , Gongora Juan Sebastian Totero , Peccianti Marco , Pasquazi Alessia
Published: August 2021

The parameter space, defined by simple global controls, is probed in a microresonator-filtered fiber laser. We identify a distinct region that clearly admits solitons and we investigate the role of slow nonlinearities in their emergence.
Single-Cavity Dual-Comb Yb:CaF2 Laser Pumped by a Single-Mode Laser Diode
Authors: Koenen D. , Willenberg B. , Pupeikis J. , Camenzind S. , Phillips C. R. , Keller U.
Published: August 2021

We present a polarization-multiplexed Yb:CaF2 dual-comb laser with 100-fs pulses at 161-MHz repetition-rate and 115-mW average power per comb pumped by a single-mode diode. We measure a high stability of the 1.15-kHz repetition-rate difference.
Efficient Passive Signal Linewidth Narrowing by Q-Engineered χ(2) Parametric Oscillators
Authors: Gluhović Ðorđe , Singh Manuj Kumar , Gentry Cale M. , Popović Miloš A.
Published: August 2021

We extend our proposal of efficient passive “noise eaters” based on Q-engineered Kerr OPOs to χ(2) systems, which could approach 100% conversion efficiency. We show that existing state-of-the-art integrated devices can implement significant passive signal linewidth narrowing using this concept.
Formation, persistence and statistics of Rogue events in microresonators
Authors: Vinod A. K. , Wang W. , Hu F. , Jiang X. , Li B. , Wong C. W.
Published: August 2021

We utilize a novel buffered time-lens architecture, panoramic-reconstruction temporal imaging (PARTI), to record long evolution portraits capturing the formation of rogue events. Further, we analyze the statistics of these events with regard to their persistence.
Topological phonon transport in an optomechanical system
Authors: Ren Hengjiang , Shah Tirth , Pfeifer Hannes , Brendel Christian , Peano Vittorio , Marquardt Florian , Painter Oskar
Published: August 2021

We report the observation of topological phonon transport within a multiscale optomechanical crystal structure consisting of an array of over 800 cavity-optomechanical elements. Using sensitive, spatially resolved optical read-out we detect thermal phonons in a 0.325 − 0.34 GHz band traveling along a topological edge channel, with substantial reduction in backscattering. This represents an important step from the pioneering macroscopic mechanical systems work towards topological phononic systems at the nanoscale.
3D printed interconnects of photonic waveguides
Authors: Moughames Johnny , Porte Xavier , Larger Laurent , Jacquot Maxime , Kadic Muamer , Brunner Daniel
Published: August 2021

We present scalable 3D photonic waveguide interconnects fabricated using two-photon polymerization. Interconnects comprise optical waveguide couplers with 1.2μm diameter, and we characterize numerous branching topologies. Finally, we demonstrate a 225 input and 529 output interconnect.
Large-Scale Optical Switches Based on Silicon Photonics
Authors: Suzuki Keijiro , Konoike Ryotaro , Namiki Shu , Kawashima Hitoshi , Ikeda Kazuhiro
Published: August 2021

We review our recent research progress of strictly non-blocking multi-port optical switches, focusing on optical and electrical packaging technologies based on flip-chip bonding and the detailed characteristics. Moreover, we discuss further improvements in switching performances.
Phase-locked and mode-locked multicore photonic crystal fiber laser with saturable absorber
Authors: Kawamura Tomonari , Shirakawa Akira
Published: August 2021

Phase-locked and mode-locked 7-core multicore photonic crystal fiber laser was demonstrated using a semiconductor saturable absorber for the first time. High energy 333 nJ, 42.4 MHz pulses were generated with a 14.1 W average power.
Ultra-Broadband Spontaneous Parametric Down- Conversion from an Aperiodically-Poled Lithium Niobate Superlattice
Authors: Toa Zi S.D. , Paterova Anna V. , Krivitsky Leonid A.
Published: August 2021

Ultra-broadband photon pairs from spontaneous parametric down-conversion are important for emerging quantum technologies. Bright ultra-broadband comb-like spectrum spanning ~40 nm around 647 nm signal wavelength from 63.5 mm long aperiodically poled lithium niobate was demonstrated.
Variable Depth Augmented Reality Display Based on Diffractive Waveguide and Liquid Crystal Varifocal Lens
Authors: Lee Kyookeun , Lee Seungjae , Milton Harry , Choi Myongjo , Kwak Kyusub , Kim James D. K.
Published: August 2021

We propose an optical see-through variable depth augmented reality display by combining a diffractive waveguide and liquid crystal lens. Depth of virtual images can be controlled up to 4D with a 0.5D step without disturbing ambient images.
Passively Mode Locked 265 nm VECSEL Utilizing All-Intracavity Harmonic Generation
Authors: Meyer Jason T. , Lukowski Michal L. , Hessenius Chris , Wright Ewan M. , Fallahi Mahmoud
Published: August 2021

We present the results of an ultrafast 265 nm passively mode locked VECSEL utilizing two stage intracavity second harmonic generation. This novel design enhances the UV lasing output power without active stabilization electronics.
320 Gb/s WDM Transmission in Monolithically Integrated Al2O3: Er3+ Spiral Amplifier on Si3N4
Authors: Chrysostomidis Themistoklis , Roumpos Ioannis , Fotiadis Konstantinos , Mu Jinfeng , Manolis Athanasios , Vagionas Chris , Dijkstra Meindert , Blanco Sonia M. Garcia , Vyrsokinos Konstantinos , Alexoudi Theoni
Published: August 2021

We report an 8×40Gb/s WDM data transmission through an Al2O3: Er3+ spiral waveguide amplifier on Si3N4 featuring 1.8dB/cm net gain. All data channels present clear eye diagrams and bit-error rate values above the KR4-FEC limit.
Large field-of-view 3D Imaging using Random Microlenses
Authors: Tian Feng , Hu Junjie , Yang Weijian
Published: August 2021

We demonstrate a lensless microscope using a single random microlens array and a fast local object reconstruction algorithm. Compared to other lensless imagers, our approach allows a large field of view and low computation complexity.
Computational Miniature Mesoscope for large-scale 3D fluorescence imaging
Authors: Xue Yujia , Davison Ian G. , Boas David A. , Tian Lei
Published: August 2021

We demonstrate a new wearable fluorescence imaging device named Computational Miniature Mesoscope (CM2), that achieves high-resolution single-shot volumetric imaging across a wide field-of-view.
Minimally-invasive lensless computational microendoscopy leveraging modal decomposition
Authors: Metais Samuel , Li Jiayue , Shin Jaewook , MacFarlane Neil , Alemohammad Milad , Harraz Maged , Foster Amy C. , Foster Mark A.
Published: August 2021

We demonstrate a lensless epi-fluorescence c omputational microendscope composed of a coded-aperture and multicore fiber. We find significant improvement in re- constructed image quality through modal decomposition of the fluorescence collected in each core of the fiber.
A Method for Increasing Thermal Stability of Short-Living Solitons in Silicon Nitride Microresonators
Authors: Grassani D. , Sabattoli F. A. , El Dirani H. , Youssef L. , Petit-Etienne C. , Kerdiles S. , Pargon E. , Liscidini M. , Sciancalepore C. , Bajoni D. , Galli M.
Published: August 2021

We exploit orthogonally polarized resonant modes to achieve thermal equilibrium for Kerr soliton generation in Si3N4 microrings. The improved thermal stability allows for soliton mode-locking simply by slow wavelength tuning or thermoelectric cooling.
Angle-of-Arrival of a Radio-Frequency Field from Sub-wavelength Rydberg Atom-based Phase Measurements
Authors: Robinson Amy K. , Prajapati Nikunjkumar , Senic Damir , Simons Matthew T. , Gordon Joshua A. , Holloway Christopher L.
Published: August 2021

Rydberg atoms in a vapor cell are used to measure the angle-of-arrival (AoA) of an incident radio-frequency plane wave through sub-wavelength phase measurements using a heterodyne technique.
Fiber-Optic Quantum Sensors for Applications in Micromagnetics and Thermal Imaging
Authors: Blakley Sean M. , Fedotov Ilya , Liu Xiaohan , Vincent Christapher , Liu Xinghua , Akimov Alexey , Hemmer Philip , Zheltikov Aleksei
Published: August 2021

High-resolution thermal and magnetic vector gradient imaging is demonstrated using diamond quantum sensors in a microstructured fiber probe platform. These sensors are capable of in situ magnetic field and temperature measurements with

160

pT
/

Hz

and

25

mK
/

Hz

sensitivities.
Single-pixel temporal imaging
Authors: Zhao Jiapeng , Dai Jianming , Braverman Boris , Zhang Xi-Cheng , Boyd Robert W.
Published: August 2021

We propose and demonstrate a single-pixel temporal imaging system with high resolution, efficiency and sensitivity. A terahertz pulse with pulse energy as low as 5 fJ is compressively imaged with a resolution down to 16 fs.
Terahertz Light Sources by Electronic-Oscillator-Driven Second Harmonic Generation in Extreme-Confinement Cavities
Authors: Ateshian Lamia , Choi Hyeongrak , Heuck Mikkel , Englund Dirk
Published: August 2021

We propose a coherent THz source by efficient, cascaded second harmonic generation from electronic oscillators. We introduce hybrid dielectric cavity designs combining extreme field concentration in high-Q resonators with phonon-resonance-enhanced nonlinear materials.
3D-Printed Resonant Gold Nanocones for Out-of-Plane Terahertz-Field-Driven Electron Photoemission
Authors: Rovere Andrea , Piccoli Riccardo , Bertoncini Andrea , Jeong Young-Gyun , Payeur Stéphane , Vidal François , Kwon O-Pil , Lee Seung-Heon , Seok Jin-Hong , Morandotti Roberto , Liberale Carlo , Razzari Luca
Published: August 2021

We numerically and experimentally investigate out-of-plane gold nanostructures resonating at terahertz frequencies for field-driven photoemission and compare their performance with a traditional non-resonant nanotip geometry.
Anomalous Contrast in Broadband THz Near-Field Imaging of Gold Microstructures
Authors: Pizzuto Angela , Chen Xinzhong , Liu Mengkun , Hu Hai , Dai Qing , Mittleman Daniel M.
Published: August 2021

We perform near-field THz imaging on a series of deeply subwavelength gold structures. We observe a contrast unrelated to changes in the material’s local properties, which we attribute to electromagnetic standing waves.
A study of ultrashort pulse train generated via tailored transparent delay mask
Authors: Marasciulli A. , Brandi F. , Fulgentini L. , Labate L. , Tomassini P. , Gizzi L. A.
Published: August 2021

Trains of femtosecond pulses generated by a delay mask are considered for application to laser driven acceleration of particles. Here we show the results of numerical simulations and a preliminary experimental characterization of a two-pulse configuration.
Choice of an Efficient Gas Target for High-Order Harmonic Generation
Authors: Weissenbilder Robin , Guo Chen , Arnold Cord L. , L’Huillier Anne
Published: August 2021

We present a simple method for choosing an efficient high-order harmonic generation (HHG) gas target, given the driving laser characteristics. The predictions are validated by simulations based on solving the time-dependent Schrödinger and propagation equations.
Recent Progress and Perspectives of High-Harmonic Generation Inside Thin-Disk Laser Oscillators
Authors: Drs Jakub , Fischer Julian , Labaye François , Modsching Norbert , Wittwer Valentin J. , Südmeyer Thomas
Published: August 2021

We discuss recent developments and the state-of-the-art of high-harmonic generation inside thin-disk laser oscillators and their potential for further scaling of the XUV performance.
Quantum Random Number Generation via Dynamically-Controlled Coupled-Resonator-Based Kerr Oscillator
Authors: Okawachi Yoshitomo , Kim Bok Young , Zhao Yun , Ji Xingchen , Lipson Michal , Gaeta Alexander L.
Published: August 2021

We demonstrate real-time quantum random number generation using an integrated silicon nitride coupled-ring-resonator-based degenerate optical parametric oscillator (DOPO). We achieve fast DOPO turn-on/off via dynamic modulation of the cavity decay time using integrated heaters.
Sweep frequency method with variance weight probability for temperature extraction of the Brillouin gain spectrum based on an artificial neural network
Authors: Wang Ming Hai , Sui Yang , Zhou Wei Nan , Dong Wei , Zhang Xin Dong
Published: August 2021

The development of optical fiber sensors has led to the possibility of accumulating vast, real-time databases of acoustic and other measurements throughout fiber networks, which brings even more widespread concern on improving the sampling effectiveness. In this paper, we present two kinds of sweep frequency methods based on using a neural network to extract temperature from the Brillouin gain spectrum (BGS). Gauss centralization and variance weight probability methods are proposed to compare with the uniform sweep frequency method. By analyzing formulas of the ideal BGS model, we find the gain near the peak of Brillouin gain spectrum has greater correlation with temperature extraction than other positions. Therefore, the Gaussian centralized sweep method is proposed. We further investigate the variation of the weights in the neural network and Brillouin data distribution in different positions and find that the variance is positively correlated with the weights in hidden layers. So, we propose the sweep frequency method based on variance weight probability and make a complement to interpret the rationality of this method in neural network. In all the aforementioned approaches, 281 points are obtained between the 9.07 GHz to 9.35 GHz range under the same condition. The data of each method is trained ten times and tested through the same neural network structure. All the RMSE of each test stage covers all data collecting the passage. The result shows that the RMSE of variance weight probability sweep frequency method is 0.5277, which is superior to the Gauss centralization sweep frequency method that was 0.6864 and the uniform sweep frequency method that was 0.9140.
Thermophoresis suppression by graphene layer in tunable plasmonic tweezers based on hexagonal arrays of gold triangles: numerical study
Authors: Samadi Mohsen , Darbari Sara , Moravvej-Farshi Mohammad Kazem
Published: August 2021

Taking advantage of highly confined evanescent fields to overcome the free-space diffraction limit, we show plasmonic tweezers enable efficient trapping and manipulation of nanometric particles by low optical powers. In typical plasmonic tweezers, trapping/releasing particles is carried out by turning the laser power on and off, which cannot be achieved quickly and repeatedly during the experiment. We introduce hybrid gold-graphene plasmonic tweezers in which the trap stiffness is varied electrostatically by applying suitable voltages to a graphene layer. We show how the graphene layer absorbs the plasmonic field around the gold nanostructures in particular chemical potentials, allowing us to modulate the plasmonic force components and the trapping potential. We show graphene monolayer (bilayer) with excellent thermal properties enables more efficient heat transfer throughout the plasmonic tweezers, reducing the magnitude of thermophoretic force by about 23 (36) times. This thermophoresis suppression eliminates the risk of photothermal damage to the target sample. Our proposed plasmonic tweezers open up possibilities to develop tunable plasmonic tweezers with high-speed and versatile force-switching functionality and more efficient thermal performance.
Chromatic aberration in planar focusing mirrors based on a monolithic high contrast grating
Authors: Komar Paulina , Gębski Marcin , Lott James A. , Wasiak Michał
Published: August 2021

We present an experimental and theoretical analysis of chromatic aberration in a monolithic metasurface focusing mirror. The planar focusing mirror is based on a monolithic high contrast grating made from GaAs, designed for a wavelength of 980 nm. Light is focused on the high refractive index side of the mirror. Our measurements, performed between 890 and 1050 nm, indicate a shift of the focal point position that is inversely proportional to the wavelength. The experimental results are in very good agreement with our simulations, in terms of both the position of the focal point and the spectral dependence. Based on our numerical simulations, we show that simply modifying the grating height does not lead to significant alteration of the focal length or to any noticeable reduction in chromatic aberration. Using numerical simulations, we analyze how the height of the stripes, the refractive index of the grating material, and its dispersion combine to influence the chromatic aberration of the mirror.
Graphene perfect absorber design based on an approach of mimicking a one-port system in an asymmetric single resonator
Authors: Lee Sangjun , Song Joohyung , Kim Sangin
Published: August 2021

We proposed a novel perfect absorber with an asymmetric single resonator supporting two degenerate resonant modes, whose operation concept is mimicking a one-port system by making only one of the modes experience loss while using the other for an internal 100% reflector in conjunction with the background scattering. We confirmed the operation principle and the design requirement from a theoretical study using the temporal coupled-mode theory. We also designed an example device based on the guided-mode resonances (GMRs) in a slab-waveguide grating and numerically demonstrated a high absorption of ∼ 99.95% in monolayer graphene with greatly enhanced fabrication error tolerance in comparison to the previously proposed scheme. Our proposed scheme will find various useful applications due to the intuitive design process and relatively easier fabrication, which is attributed to the one-port mimicking operation concept with a single GMR-based broadband flat-top reflector.