bluuebunny/crossref_metadata_2025 huggingface dataset:
Non-Hermitian Topological Light Steering
Authors: Zhao Han , Qiao Xingdu , Wu Tianwei , Midya Bikashkali , Longhi Stefano , Feng Liang
Published: September 2020

By strategically interfacing non-Hermitian and topological physics, we demonstrate arbitrary, robust light steering in reconfigurable non-Hermitian junctions, in which chiral topological states can propagate at an interface of the gain and loss domains.
High-Harmonic Generation in Dielectric Metasurfaces Empowered by Bound States in the Continuum
Authors: Zograf George , Zalogina Anastasia , Koshelev Kirill , Choi Duk-Yong , Korolev Viacheslav , Hollinger Richard , Kartashov Daniil , Zürch Michael , Spielmann Christian , Makarov Sergey , Luther-Davies Barry , Kruk Sergey , Kivshar Yuri
Published: September 2020

We demonstrate nonlinear silicon metasurfaces empowered by collective localized modes governed by bound states in the continuum operating in mid-infrared spectral range. When being resonantly excited, the metasurfaces generate 3rd to 11th odd optical harmonics.
Entanglement Distribution Using a Number State and a Beam Splitter
Authors: Franson J.D. , Shringarpure S.U.
Published: September 2020

We show that a photon number state incident on a beam splitter will create a phase- entangled state that violates Bell’s inequality. This approach may have practical applications in quantum communications and quantum key distribution.
Ultrafast Acoustic Phonon Dynamics in the Weyl Semimetal TaAs Probed by Time-Resolved X-ray Diffraction
Authors: Lee Min-Cheol , Sirica N. , Teitelbaum S. W. , Maznev A. , de la Pena Munoz G. A. , Krapivin V. , Huang Y. , Shi J. , Tutchton R. , Zhu J.-X. , Zhao L. X. , Chen G. F. , Xu B. , Yang R. , Qiu X. G. , Yarotski D. A. , Nelson K. A. , Trigo M. , Reis D. A. , Prasankumar R. P.
Published: September 2020

We utilized ultrafast X-ray diffraction to investigate optically induced strain waves in the Weyl semimetal TaAs, revealing real-time structural oscillations originating from quasilongitudinal and quasi-shear acoustic phonon modes.
Strong confinement of short-wave Brillouin phonons in silicon waveguide periodic lattices
Authors: de Oliveira Zurita Roberto , Wiederhecker Gustavo S. , Alegre Thiago P. M.
Published: September 2020

We propose a feasible silicon waveguide design that can strongly trap short-wavelength Brillouin phonons. Intramodal backward Brillouin gain is improved about 4.3 while radiation losses are suppressed. The structure could be implemented using SOI technology.
Persistence of extreme events in microresonators
Authors: Vinod A. K. , Wang W. , Huang S. W. , Yang J. , Li B. , Wong C. W.
Published: September 2020

Here we report a novel method utilizing a four-wave-mixing time lens to observe and characterize rogue waves in microresonators. We also experimentally measure, for the first time, persistence of these extreme events.
Optical Parametric Oscillation Using 4H-SiC-on-Insulator Nanophotonics
Authors: Guidry Melissa A. , Yang Ki Youl , Lukin Daniil M. , Yang Joshua , Vučković Jelena
Published: September 2020

We experimentally demonstrate 22 mW-threshold on-chip optical parametric oscillation using 4H-SiC-on-insulator microring resonators. Low-loss, high-confinement resonators may exhibit threshold powers as low as 6 mW.
Tunable Mie-resonant dielectric metasurfaces based on VO2 phase-change materials
Authors: Kruk Sergey , John Jimmy , Zhang Zhen , Nguyen Hai Son , Berguiga Lotfi , Romeo Pedro Rojo , Orobtchouk Regis , Ramanathan Shriram , Kivshar Yuri , Cueff Sebastien
Published: September 2020

We demonstrate Mie-resonant silicon metasurfaces tunable via the insulator-to-metal transition of a deposited VO2 layer. We observe two orders of magnitude modulation depth of the metasurface reflection with reversible properties and a hysteresis-like behavior.
Ultrafast Diffraction Switching Using GaAs Metasurfaces
Authors: Vabishchevich P. P. , Vaskin A. , Karl N. , Reno J. L. , Sinclair M. B. , Staude I. , Brener Igal
Published: September 2020

We design a resonant metasurface that uses Mie quadrupole modes to suppress the -1 diffraction order. We show that this suppression can be spectrally tuned using optical pumping on a picosecond timescale.
Wideband nonmagnetic linear optical isolator in thin-film lithium niobate
Authors: Abdelsalam Kamal , Li Tengfei , Khurgin Jacob B. , Fathpour Sasan
Published: September 2020

We introduce a new class of wideband and integrated nonmagnetic linear optical isolators based on nonlinear frequency conversion and spectral filtering with isolation ratio up to 40 dB and bandwidth in excess of 150 nm.
Aliasurface- Aliasing Based Metasurface
Authors: Cohen Kobi , Tsesses Shai , Blechman Yael , David Asaf , Bartal Guy
Published: September 2020

We present a new degree of control over surface-waves enabled by aliasing in periodic structures. Using phase-resolved near-field microscopy, we map t he twodimensional eigenmodes and demonstrate geometry-dependent control over their propaga-tion, featuring new diffraction schemes.
Large Scale Fabrication of Chiral Metamaterials
Authors: Zhao Yiping
Published: September 2020

By combining nanosphere monolayer and glancing angle deposition, several strategies have been demonstrated to fabricate quasi-three dimensional or three-dimensional chiral metamaterials such as fan-structures, helically stacked plasmonic structures, Swiss-roll structures, and chiral-nanohole arrays. (tel: +1 706.542.7792, e-mail: zhaoy@uga.edu).
Pin-like Optical Vortex Beams
Authors: Li Denghui , Bongiovanni Domenico , Goutsoulas Mihalis , Hu Yi , Song Daohong , Morandotti Roberto , Efremidis Nikolaos K. , Chen Zhigang
Published: September 2020

We demonstrate pin-like optical vortex beams (PO^s) by tailoring amplitude and phase of a laser beam in Fourier space. For certain applications, such PO^s with anti-diffractive features can outperfom conventional Bessel and abruptly auto-focusing beams.
High Q-factor resonators and nanoantennas based on phonon polaritons in van der Waals materials
Authors: Tamagnone Michele , Meretska Maryna , Chaudhary Kundan , Spagele Christina M. , Zhu Alex , Li Jiahan , Edgar James H. , Ambrosio Antonio , Capasso Federico
Published: September 2020

We experimentally demonstrate mid-infrared resonators and antennas with Q-factors larger than 350 based on phonon polaritons in hexagonal boron nitride and molybdenum trioxide. We characterize the fabricated nanostructures with near field imaging and spectroscopy.
Spatiotemporal Photonic Crystals
Authors: Sharabi Yonatan , Lustig Eran , Dikopoltsev Alex , Lumer Yaakov , Segev Moti
Published: September 2020

We study photonic systems periodic in both time and space - spatiotemporal photonic crystals, and find that their bandstructure contains both frequency and momentum bandgaps. When the two types of bandgaps coincide, anomalous bandstructure is observed.
Petermann-factor limited sensing near an exceptional point
Authors: Wang H. , Lai Y.-H. , Yuan Z. , Suh M.-G. , Vahala K.
Published: September 2020

We show that enhanced responsivity of a laser gyroscope operating near an exceptional point is accompanied by laser linewidth broadening related to the Petermann factor. The broadening imposes a fundamental sensitivity limit.
Free Electron Cavity Quantum Electrodynamics in an Ultrafast Electron Microscope
Authors: Wang Kangpeng , Dahan Raphael , Shentcis Michael , Kauffmann Yaron , Hayun Adi Ben , Reinhardt Ori , Tsesses Shai , Kaminer Ido
Published: September 2020

We observe an increased interaction strength and time between quantum electron wavepackets and laser pulses due to the large Q-factor of a photonic crystal slab, promoting the integration of free-electron emitters into cavity quantum electrodynamics.
Static and Dynamic Stark Tuning of the Silicon Vacancy in Silicon Carbide
Authors: White Alexander D. , Lukin Daniil M. , Guidry Melissa A. , Trivedi Rahul , Morioka Naoya , Babin Charles , Kaiser Florian , Ul-Hassan Jawad , Son Nguyen Tien , Ohshima Takeshi , Vasireddy Praful , Nasr Mamdouh , Nanni Emilio , Wrachtrup Jörg , Vučković Jelena
Published: September 2020

We present the DC Stark tuning of single Silicon Vacancies in SiC. We demonstrate static tuning across 200 GHz, exceeding the inhomogenous broadening, and dynamic tuning on timescales shorter than the optical decay rate.
Two-photon Absorption in Semiconductor Monolayers
Authors: Wu Qile , Liu Haiyi , Wang Ping , Mi Zetian , Cundiff Steven T. , Kira M.
Published: September 2020

Two-photon absorption in GaN monolayers is studied with a systematic many-body theory. A nearly perfect quantum efficiency for two-photon absorption is found in a cavity, and the results identify vitally important quantum-memory and intriguing Coulomb-enhancement effects.
Topological compensation of Rayleigh scattering induced reflection in a single mode waveguide
Authors: Lee Hwaseob , Wang Feifan , Li Tiantian , Scallo Alec , Wang Zi , Gu Tingyi
Published: September 2020

Intrinsic backscattering generated from waveguide sidewall roughness is suppressed by a designed dielectric scatter. Merging mode-splitting in a micro-ring resonator confirms the exceptional point.
Observation of Anderson localization by virtual transitions
Authors: Dikopoltsev Alex , Kremer Mark , Sheinfux Hanan Herzig , Weidemann Sebastian , Szameit Alexander , Segev Mordechai
Published: September 2020

We observe experimentally that virtual transitions can cause Anderson localization, without any firstorder scattering processes. We implement this in a time-bin encoded 1+1D lattice in fiber loops.
Two photon interference via coupled ring resonators on a silicon photonic chip
Authors: Serafini John , Spiecker David , Steidle Jeffrey , Fanto Michael , Hach Ed , Preble Stefan
Published: September 2020

We demonstrate an on-chip Hong-Ou-Mandel (HOM) experiment where the conventional directional coupler-based beam splitter is replaced with coupled ring resonators. Two photon interference is achieved with raw visibilities as high as 95% and, ~ n rotation is achieved.
An Advanced Apparatus for Integrating Nanophotonics and Cold Atoms
Authors: Qin Zhongzhong , Beguin Jean-Baptiste , Burgers Alexander , Luan Xingsheng , Yu Su-Peng , Kimble H. Jeff
Published: September 2020

Integrating nanophotonics with cold atoms permits the exploration of novel paradigms in quantum optics and many-body physics. We realize an advanced apparatus which enables the delivery of single-atom tweezer arrays in the vicinity of photonic crystal waveguides.
Twisting Polarization of Ultrafast Pulses using Metasurfaces
Authors: Chen Lu , Zhu Wenqi , Song Junyeob , Huo Pengcheng , Strait Jared , Zhang Cheng , Zhou Wei , Lezec Henri J. , Xu Ting , Agrawal Amit
Published: September 2020

Dielectric metasurfaces enable control of the temporal profile of large bandwidth, near-infrared femtosecond pulses. Using this approach, we demonstrate shaping of the time-domain polarization state within a single pulse.
Light-Emitting Metasurfaces: A Metalens Approach for Focusing Spontaneous Emission
Authors: Mohtashami Yahya , DeCrescent Ryan A. , Iyer Prasad P. , Butakov Nikita A. , Mitchell William J. , Alhassan Abdullah , Nakamura Shuji , DenBaars Steven P. , Schuller Jon A.
Published: September 2020

We present a metalens design made from GaN nanopillars with embedded quantum-well emitters. We fabricate, using nanolithography, metalenses with different focal lengths and observe that the proposed design can effectively focus the emitted photoluminescence.
Topological Behaviors in Networks of Time-Multiplexed Optical Resonators
Authors: Leefmans Christian , Dutt Avik , Williams James , Yuan Luqi , Fan Shanhui , Marandi Alireza
Published: September 2020

We observe topological phenomena in coupled, time-multiplexed optical resonators by mapping topologically nontrivial energy spectra to the network’s loss. We detect topological edge states and reconstruct the band structures of noninteracting tight-binding Hamiltonians.
Attosecond streaking of parametrically amplified and synthesized waveforms.
Authors: Scheiba Fabian , Yang Yudong , Rossi Giulio Maria , Mainz Roland E. , Silva-Toledo Miguel A. , Keathley Phillip D. , Cirmi Giovanni , Kartner Franz X.
Published: September 2020

We demonstrate attosecond streaking with a parametric waveform synthesizer. The characterization demonstrates the excellent pulse-to-pulse stability and versatile waveform shaping at subcycle pulse durations, allowing for the direct generation of isolated attosecond pulses.
Demonstration of a nonlinearity induced photonic topological insulator
Authors: Maczewsky Lukas J. , Heinrich Matthias , Kremer Mark , Ivanov Sergey K. , Ehrhardt Max , Martinez Franklin , Kartashov Yaroslav V. , Konotop Vladimir V. , Torner Lluis , Szameit Alexander
Published: September 2020

We theoretically propose and experimentally demonstrate a nonlinear photonic Floquet topological insulator. The system enters a topological non-trivial phase under the influence of a high-power excitation by the optical Kerr effect in detuned directional couplers.
Inverse designed metagratings for far-field integral equations solving
Authors: Cordaro Andrea , Edwards Brian , Nikkhah Vahid , Alu Andrea , Polman Albert , Engheta Nader
Published: September 2020

We present a metasurface-based platform that solves Fredholm integral equations of the second kind for free-space radiation. An inverse-designed metagrating is coupled to a semitransparent mirror providing feedback in order to perform an analog version of the Neumann series.
Reparameterization to Enforce Constraints in the Inverse Design of Metasurfaces
Authors: Chen Mingkun , Jiang Jiaqi , Fan Jonathan A.
Published: September 2020

We report new scheme for enforcing constraints on structural features of merasurfaces in inverse design process by imposing controls through transforming the parameter space. Using this method, we design metagratings with restricted minimum feature size.
Space-Time Wave Packets Wave-Guided in an Unpatterned Thin Film
Authors: Shiri Abbas , Yessenov Murat , Webster Scott , Schepler Kenneth L. , Abouraddy Ayman F.
Published: September 2020

We demonstrate that propagation-invariant ‘space-time’ wave packets can be guided in two dimensions in an unpatterned thin optical film by relying on index-guiding in one dimension and on space-time confinement in the other.
Landau levels in inhomogeneously strained photonic crystals
Authors: Guglielmon Jonathan , Rechtsman Mikael C. , Weinstein Michael I.
Published: September 2020

We theoretically demonstrate the emergence of highly degenerate Landau levels in inhomogeneously strained 2D photonic crystals. This provides a novel mechanism for engineering high density of states in photonic media.
All-dielectric Metasurface Designs Enabled by Deep Neural Networks
Authors: An Sensong , Fowler Clayton , Zheng Bowen , Shalaginov Mikhail Y. , Tang Hong , Li Hang , Ding Jun , Kang Myungkoo , Agarwal Anuradha Murthy , Rivero-Baleine Clara , Richardson Kathleen A. , Gu Tian , Hu Juejun , Zhang Hualiang
Published: September 2020

We propose a deep learning design approach that significantly improves the design efficiency and accuracy over traditional trial-and-error methods that are currently in use to engineer metasurface-based devices.
Single-Shot Absorption Imaging of Ultracold Atoms Using Deep-Neural-Network
Authors: Ness Gal , Vainbaum Anastasiya , Shkedrov Constantine , Florshaim Yanay , Sagi Yoav
Published: September 2020

We demonstrate the use of a deep-neural-network to perform absorption imaging of ultracold atoms in a single exposure. The noise in the resulting images is smaller, hence physical observables can be extracted with better accuracy.
A synchronized VUV beamline for time domain two-color dynamic studies at FLASH2
Authors: Appi Elisa , Papadopoulou Christina C. , Mapa Jose , Wesavkar Nishad , Jusko Christoph , Mosel Philip , Alisauskas Skirmantas , Lang Tino , Heyl Christoph M. , Manschwetus Bastian , Braune Markus , Brachmanski Maciej , Lindenblatt Hannes , Trost Florian , Meister Severin , Schoch Patrizia , Treusch Rolf , Moshammer Robert , Hartl Ingmar , Morgner Uwe , Kovacev Milutin
Published: September 2020

We present a HHG-based vacuum ultraviolet (VUV) source at the free electron laser FLASH2. The source provides ultrashort pulses from 10 to 40eV, coupled to the REMI end-station (beamline FL26) for VUV-FEL pump-probe experiments.
Single-shot Measurement of Extreme Ultraviolet Free Electron Laser Pulses
Authors: Peters William , Jones Travis , Efimov Anatoly , Pedersoli Emanuele , Foglia Laura , Mincigrucci Riccardo , Nikolov Ivaylo , Trebino Rick , Sandberg Richard , Danailov Miltcho , Capotondi Flavio , Bencivenga Filippo , Bowlan Pamela
Published: September 2020

We demonstrate an all-optical approach for measuring spectrograms of individual FEL pulses by measuring a spectrally-resolved EUV-EUV-optical four-wave-mixing signal. We experimentally demonstrate that this is phase-sensitive can be applied to structured and unstable pulse trains.
Optical field recovery through thin scattering layer for wide-field scattering imaging
Authors: Liu Jietao , Li Wei , He Shunfu , Xia Mingrui , Wu Yuxiang , Zhu Jinjin , Liu Lixian , Shao Xiaopeng
Published: September 2020

Wide-field imaging through thin scattering layer is verified experimentally utilizing round-trip optical field estimation method. Large field-of-view imaging strategy dealing with complex and even violent phase variations is demonstrated.
Spatio-temporal dynamics of highly multimode semiconductor lasers
Authors: Kim Kyungduk , Bittner Stefan , Zeng Yongquan , Guazzotti Stefano , Hess Ortwin , Wang Qi Jie , Cao Hui
Published: September 2020

We present a cavity design for broad-area semiconductor lasers that stabilizes lasing dynamics and produces directional emission. By tuning the cavity geometry, we control nonlinear interactions of the lasing modes with the gain medium.
Elastic-Tape Picture of a Bi-Directional Kerr-Lens Mode-Locked Dual-Comb Ring Laser
Authors: Lomsadze Bachana , Fradet Kelly M. , Arnold Richard S.
Published: September 2020

A fixed point of a bi-directional dual-comb ring laser is investigated. Using dual-comb spectroscopy we show how changes in the combs’ relative repetition and offset frequencies are correlated, giving insight into the combs’ mutual coherence.
Photodetector Flicker Noise Optimization for Ultralow Noise Optical-to-Electrical Conversion
Authors: Lee Dahyeon , Nakamura Takuma , Campbell Joe C. , Diddams Scott A. , Quinlan Franklyn
Published: September 2020

We examine the optical pulse width and illumination spot size dependence on the flicker phase noise of a photodiode, resulting in a 10 dB noise reduction to -143/f dBc/Hz on a 1 GHz carrier.
Dual-chirped optical parametric amplification for energy scaling of near-IR, mid-IR, and far-IR pulses
Authors: Takahashi Eiji J.
Published: September 2020

A robust energy scaling method for infrared pulses using a dual-chirped optical parametric amplification is presented. TW mid-infrared pulses enable generation of a nano-joule level water window high-order harmonic beam.
Broadband Mid-Infrared Source Tunable through 3-11pm Based on Yb-doped Laser and Dual OPA Setup
Authors: Budriunas Rimantas , Jurkus Karolis , Varanavicius Arunas
Published: September 2020

We present a technique for generating broadly tunable, broadband pulses in the midinfrared. The method is based on mixing ~30fs pulses at 1.8pm with narrowband pulses tuned through 2.0-4.0pm in GaSe crystal. Output pulses with FWHM bandwidths of 171-665cm-1 are produced in the range from 3 pm to over 11pm. We demonstrate MIR power up to >200mW at 4.7 pm, using a compact 1.7mJ, 10kHz pump laser. The setup could be readily adapted to a wide variety of Yb-doped lasers already present in many research labs.
Transmissive Multi-plane Light Conversion for Demultiplexing Orbital Angular Momentum Modes
Authors: Lin Zhongzheng , Wen Yuanhui , Chen Yujie , Yu Siyuan
Published: September 2020

We design and demonstrate an OAM mode demultiplexer based on a novel transmissive multi-plane light conversion scheme and fabricated on two glass plates with doublesided patterns. 7 OAM modes are supported across the C-band.
Metasurface Manufacturing on 300-mm Wafer Platforms
Authors: Li Nanxi , Xu Zhengji , Dong Yuan , Hu Ting , Zhong Qize , Fu Yuan Hsing , Zhu Shiyang , Singh Navab
Published: September 2020

The CMOS-compatible flat optics fabrication platforms developed within the Institute of Microelectronics (IME) for multi-purpose wafers have been presented. The work aims to drive the flat optics towards the mass-manufacturing and commercialization.
Silicon Photonic 2.5D Integrated Multi-Chip Module Receiver
Authors: Abrams Nathan C. , Cheng Qixiang , Glick Madeleine , Jezzini Moises , Morrissey Padraic , O’Brien Peter , Bergman Keren
Published: September 2020

We demonstrate the first 2.5D integrated, wavelength division multiplexing, silicon photonic receiver. The multi-chip module utilizes a silicon interposer to integrate the four-channel photonic cascaded microdisk receiver with four electronic transimpedance amplifiers.
FPGA implemented real time computational coherent averaging algorithm for dual-comb spectroscopy
Authors: Chen Yifeng , Westberg Jonas , Liu Jie , Wysocki Gerard
Published: September 2020

We report a FPGA implementation of coherent averaging for dual comb spectroscopy and demonstrate with free-running combs a 7 times improvement in random noise as compared with post-processed raw data given the same acquisition time.
Field deployment of a mid-infrared dual-comb spectrometer for measurement of volatile organic compounds
Authors: Cossel K.C. , Waxman E.M. , Giorgetta F.R. , Baumann E. , Yeas G. , Herman D.I. , Friedlein J. T. , Bon D. , Coddington I. , Newbury N.R.
Published: September 2020

We deploy a mid-infrared dual-comb spectrometer in a van for field measurements of volatile organic compounds (VOCs). We also use a similar, laboratory system to measure ambient VOCs over a 2km round-trip path. Work of the US Government and not subject to copyright.
Controlling the integrated micro-lasers with ultrahigh speed and ultralow energy consumption
Authors: Song Qinghai , Xiao Shumin
Published: September 2020

Here we study the bounded states in the continuum (BICs) based microlasers in microcavity. With the assistance of BICs, the trade-off between ultrahigh speed and ultralow energy consumption can be broken for the first time.
170-nm Tuning Range and Low-threshold Cr4+:YAG Double-clad Crystal Fiber Laser
Authors: Li Yi-Hsun , Lin Yu-Chan , Hsu Yu-Wei , Yang Teng-I , Huang Sheng-Lung
Published: September 2020

A broadly tunable Cr4+:YAG double-clad crystal fiber laser is demonstrated by laser diode pump with a threshold power of 55 mW. The tuning range was 170 nm centered at 1438 nm limited by excited-state absorption.
Ultra-Large Mode Area Chalcogenide Photonic Crystal Fiber for High-Power Mid-Infrared Applications
Authors: Feng Xian , Ren He , Qi Sisheng , Hu Yongsheng , Han Feng , Shi Jindan , Yang Zhiyong
Published: September 2020

We report a mid-infrared chalcogenide glass ultralarge mode area photonic crystal fiber for high power applications. Broadband mid-infrared single-mode operation and supercontinuum have been observed in the fiber with recorded mode area of 5200pm2.
Cracking the Design Complexity of Nanostructures Using Geometric Deep Learning
Authors: Zandehshahvar Mohammadreza , Kiarashinejad Yashar , Hemmatyar Omid , Abdollahramezani Sajjad , Pourabolghasem Reza , Adibi Ali
Published: September 2020

We present a new approach based on machine learning algorithms for inverse design of photonic nanostructure to provide the desired response while iteratively reducing the complexity of the structure to minimize the design complexity.
Telecom InAs quantum-dot FP and microdisk lasers epitaxially grown on (111)-faceted SOI
Authors: Wang Ting , Wei Wenqi , Feng Qi , Wang Zihao , Zhang Jianjun
Published: September 2020

By utilizing homo-epitaxially formed (111)-faceted silicon hollow structures on U- shaped patterned silicon on insulator (SOI) substrates, 1310 nm and 1510 nm InAs quantum dot (QD) fabry-perot and microdisk lasers are achieved on such platform, which paves a promising way to realize silicon-based light source for silicon photonic integration.
Phase Transition and Raman Evolution in Pressurized Antiferromagnetism van der Waals Topological Insulator
Authors: Zhao Zhangji , Hu Chaowei , Kavner Abby , Ni Ni , Wong Chee Wei
Published: September 2020

We investigate the antiferromagnetic topological insulator MnBi4Te7 using Raman and powder XRD under high pressure. Raman peaks are red-shifted from 0 to 8.28 GPa. No structural phase transition is observed below 10.4GPa.
Frequency Stabilization of a Quantum Cascade Dual-Comb Spectrometer to a Molecular Transition
Authors: Teng Chu C. , Westberg Jonas , Wysocki Gerard
Published: September 2020

We demonstrate absolute frequency stabilization of a quantum cascade dual-comb spectrometer to a molecular transition. A line-locked quantum cascade laser is introduced to the dual-comb system, improving frequency stability to <0.5 MHz.
Thermal Infrared Spectral Imagers Based on Graphene-Loaded Slot Antennas
Authors: Goldstein Jordan A. , Englund Dirk R.
Published: September 2020

We propose a compact thermal infrared spectral imager comprising a meta surface composed of subwavelength-spaced graphene-loaded slot antennas. We establish a model for the antennas’ properties and simulate a metasurface with broadband efficient absorption.
Voltage-Controlled Long-Range Transport of Indirect Excitons in MoSe2/WSe2 Van der Waals Heterostructure
Authors: Fowler-Gerace L.H. , Choksy D.J. , Butov L.V.
Published: September 2020

We observe transport of indirect excitons over a distance greater than 10 pm in a MoSe2/WSe2 heterostructure. The transport is switched on or off by gate voltage and is observed up to 40 K.
Performance degradation of digital back-propagation in the presence of power excursion
Authors: Huang Xiatao , Yi Xingwen , Fan Qirui , Jin Taowei , Zhou Gai , Zhang Jing , Xu Bo , Li Fan , Li Zhaohui , Lu Chao , Lau Alan Pak Tao
Published: September 2020

Unlike linear transmission, the performance of nonlinear optical fiber transmission can change significantly in the presence of power excursion. We experimentally show a much larger SNR degradation and its dependence on the location of power excursion.
Ultra-sensitive silicon nitride waveguide-enhanced Raman spectroscopy for aqueous solutions of organic compounds
Authors: Liu Zuyang , Zhao Haolan , Baumgartner Bettina , Lendl Bernhard , Skirtach Andre , Le Thomas Nicolas , Baets Roel
Published: September 2020

We demonstrate a waveguide-enhanced Raman sensor functionalized with mesoporous silica coating for organic compounds in aqueous solutions. The detection limit of cyclohexanone in water is improved by at least 100 times compared to bare waveguides.
Integrated Spiral Waveguide Filter with 55 Arbitrary Notches: Design and Fabrication
Authors: Hu Yi-Wen , Xie Shengjie , Zhan Jiahao , Zhang Yang , Veilleux Sylvain , Dagenais Mario
Published: September 2020

We design and fabricate an integrated arbitrary filter near 1550 nm. The 50 mm long 55-notch filter is implemented on a low-loss SisNVSiOi spiral waveguide. The notches have uniform depths/widths of about 28 dB/0.22 nm.
Nonvolatile Electrically Reconfigurable Integrated Photonic Switches Using Phase-Change Materials
Authors: Zheng Jiajiu , Fang Zhuoran , Wu Changming , Zhu Shifeng , Xu Peipeng , Doylend Jonathan K. , Deshmukh Sanchit , Pop Eric , Dunham Scott , Li Mo , Majumdar Arka
Published: September 2020

We report nonvolatile electrically reconfigurable photonic switches using PCM-clad waveguides and microrings actuated by in-situ silicon PIN heaters. High extinction ratio (~15 dB), near-zero extra loss, and high cyclability (> 1000) are demonstrated.
Periodic Dispersive Wave Pattern Induced by Ozone Formation in Air-Filled Hollow-Core Fiber
Authors: Sabbah Mohammed , Belli Federico , Brahms Christian , Gao Shou-Fei , Wang Ying-Ying , Wang Pu , Travers John. C.
Published: September 2020

We describe the experimental observation of ozone formation inside an air-filled hollow-core fiber driven by ultra-short pulses and its effect on the emitted UV resonant dispersive wave.
Laser-Written Silicon-Germanium Alloy Microstructures with Tunable Compositionally Graded Profiles
Authors: Aktas Ozan , MacFarquhar Stuart J. , Oo Swe Z. , Mittal Vinita , Chong Harold M. H. , Peacock Anna C.
Published: September 2020

A laser processing method is introduced for post-deposition tailoring of local composition and bandgap in amorphous silicon-germanium thin films on silicon substrates. Spatial distribution of the alloy constituents can be controlled through the scan speed.
Phase Change Perovskite Metasurfaces
Authors: Adamo Giorgio , Tian Jingyi , Degani Matteo , Krishnamoorthy Harish N. S. , Cortecchia Daniele , Klein Maciej , Soci Cesare
Published: September 2020

We report the first dielectric perovskite metasurfaces with continuously tenable optical response across the visible spectmm via a small temperatere gradient around room temperature, bearing potential applications in active light-emitting devices and spatial-light-modulators.
Quantum cascade laser frequency stabilization to an atomic mid-infrared transition
Authors: Sebbag Yoel , Zektzer Roy , Barash Yefim , Levy Uriel
Published: September 2020

We demonstrate frequency stabilization of a distributed feedback quantum cascade laser at 5.23 pm to an atomic transition of Rubidium vapors, paving the way for establishing portable and accurate primary frequency references in the mid-infrared.
Enhanced On-Chip Phase Measurement by Weak Value Amplification
Authors: Song Meiting , Steinmetz John , Zhang Yi , Nauriyal Juniyali , Baez Marissa Granados , Jordan Andrew N. , Cardenas Jaime
Published: September 2020

We show, for the first time, phase measurement with weak value amplification on an integrated photonic chip. We demonstrate 9 dB of signal enhancement over a standard on-chip Mach-Zehnder interferometer with equal detected optical power.
44 Gb/s PAM-4 Transmission with a Polarization- Independent Surface-Normal Electroabsorption Modulator
Authors: Iannone Patrick , Chen Xi , Grillanda Stefano , Raybon Gregory , Adamiecki Andrew , Burrows Ellsworth , Hu Ting-Chen , Neilson David , Basavanhally Nagesh , Low Yee , Kopf Rose , Tate Alaric , Earnshaw Mark
Published: September 2020

We measure performance of 44-Gb/s (22-GBd) PAM-4 short-reach direct detection links with a polarization-independent surface-normal electro-absorption modulator. Performance below the KP-4 FEC threshold is demonstrated in standard single-mode fiber links with no dispersion compensation for distances up to 18 km.
A High-resolution Fourier-transform Spectrometer based on cascaded a ring resonator and an MZI array
Authors: Zhu H. H. , Zheng S. N. , Zou J. , Cai H. , Li Z. Y. , Liu A. Q.
Published: September 2020

A high-resolution FT spectrometer consists of a cascaded microring resonator and an MZI array is demonstrated and achieved a high resolution of 0.74 nm and bandwidth of 20 nm. It has high potential in biochemical sensing applications.
Integrated turnkey soliton microcombs operated at CMOS frequencies
Authors: Shen Boqiang , Chang Lin , Liu Junqiu , Wang Heming , Yang Qi-Fan , Xiang Chao , Wang Rui Ning , He Jijun , Liu Tianyi , Xie Weiqiang , Guo Joel , Kinghorn David , Wu Lue , Ji Qing-Xin , Kippenberg Tobias J. , Vahala Kerry , Bowers John E.
Published: September 2020

We experimentally discovered and theoretically explain a novel turnkey regime for operation of soliton microcombs, wherein a new operating point enables the direct access of the soliton state by simple turn-on of the pump laser.
Real-time spectral interferometry assisted recording of acoustic wave
Authors: Luo Yiyang , Ni Wenjun , Shum Perry Ping , Xia Ran , Tang Xiahui , Zhao Luming , Sun Qizhen
Published: September 2020

Optical spectroscopy yields the investigations of soliton molecular dynamics. Here, we transfer the concept of real-time spectral interferometry to the dynamic-parameter sensing, especially highlighting the shot-to-shot pulse interferograms assisted recording of acoustic wave.
High resolution spatially continuous curvature sensing using a twisted multicore optical fiber
Authors: Ahmad Raja , Ko Wing , Westbrook Paul S. , Feder Kenneth S.
Published: September 2020

Using a twisted multicore optical fiber, we demonstrate the distributed curvature sensing on a textured surface having sinusoidal deformations of a micron-scale peak-to-peak amplitude and a sub-millimeter spatial period.
Brillouin Optical Time Domain Analysis Using Spectrally Reshaped 12-GHz Spacing Multimode Pump and Probe
Authors: Tanaka Yosuke , Hasegawa Takahiro
Published: September 2020

We propose and experimentally demonstrate Brillouin optical time domain analysis using spectrally reshaped multimode pump and probe light, which amplifies the probe light in proportion to the change in amount of Brillouin frequency shift.
Effective Nonlinearity of BaGa2GeSe6: A Promising Quaternary Chalcogenide Crystal for the Mid-IR
Authors: Kato Kiyoshi , Badikov Valeriy V. , Wang Li , Panyutin Vladimir L. , Mitin Konstantin V. , Miyata Kentaro , Petrov Valentin
Published: September 2020

We determine the magnitude and relative sign of the nonlinear coefficients of the low- symmetry trigonal nonlinear crystal BaGa2GeSe6: dn= +23.6, d22= -18.5, and d^i= +18.3 pm/V, opening the way for maximizing deff and broad applications.
Improving the Inference Accuracy of Diffractive Optical Neural Networks Using Class-specific Differential Detection
Authors: Li Jingxi , Mengu Deniz , Luo Yi , Rivenson Yair , Ozcan Aydogan
Published: September 2020

We report all-optical object classification systems that are based on class-specific design of diffractive neural networks followed by a differential detection scheme. The blind inference accuracies achieved through this framework are significantly enhanced.
Demonstration of an Optoelectronic Excitatory & Inhibitory Neuron for Photonic Spiking Neural Networks
Authors: Lee Yun-Jhu , On Mehmet Berkay , Xiao Xian , Ben Yoo S. J.
Published: September 2020

We designed, simulated, prototyped, and experimentally demonstrated an optoelectronic neuron with excitatory and inhibitory inputs. LTSpice simulation and experimental results closely resemble the Izhikevich model, and inhibitory input negates excitatory input to suppress output spikes.
Coherent control of boosted Terahertz radiation from air plasma pumped by femtosecond 3-color sawtooth field
Authors: Liu Shaojie , Lu Chenhui , Fan Zhengquan , Gui Jieyu , Liang Qingqing , Zhou Bing , Houard Aurelien , Mysyrowicz Andre , Zhuang Songlin , Liu Yi
Published: September 2020

Amplitude of Terahertz radiation from air plasma is enhanced by one order of magnitude with a 3-color femtosecond sawtooth field. Moreover, the THz wave can be coherently controlled by the two relative phases.
Picking Out Nonlinear Collective Couplings with TwoDimensional Terahertz Spectroscopy
Authors: Knighton Brittany E. , Nielson Megan , Hardy R. Tanner , Alejandro Aldair , Rawlings Lauren , Johnson Jeremy A
Published: September 2020

2D terahertz spectroscopy can disentangle coupling between different degrees of freedom. We discuss the complex 2D terahertz spectra of p-barium borate and model different vibrational couplings to assign spectral features that arise from such coupling.
Low Index Asymmetric Bound States in the Continuum for Low Loss Integrated Photonics
Authors: Vertchenko Larissa , Malureanu Radu , DeVault Clayton , Mazur Eric , Lavrinenko Andrei V.
Published: September 2020

Radiative and intrinsic losses are significant challenges faced by near-zero-index materials. Zero-index photonic crystals with Bound States in the Continuum are able to overcome these challenges. Here we experimentally verify the combined effects in a novel photonic crystal design.
Comb-locked cavity-ringdown spectroscopy for molecular transition frequency measurements below 1×10-12 relative uncertainty
Authors: Reed Zachary D. , Long David A. , Fleurbaey Helene , Hodges Joseph T.
Published: September 2020

We describe highly accurate molecular line positions determined by a recently developed comb-locked cavity ring-down spectrometer. Molecular transition frequencies near 1.6 pm are determined with relative total uncertainties below 1 x 10-12 (200 Hz absolute uncertainty).
Noise-immune, cavity-enhanced, optical heterodyne molecular spectroscopy (NICE-OHMS) for trace gas detection
Authors: Curtis E. Anne , Black Nicola C. G. , Barwood Geoffrey P.
Published: September 2020

Real-time measurement of trace gases using NICE-OHMS shows great promise in delivering the required sensitivity to meet the needs of many sectors. We present progress on NICE-OHMS-based gas sensing devices for industrial and other applications.
A Lidar System Based on Integrated Lens Assisted Twodimensional Beam Steering
Authors: Cao Xianyi , Qiu Gaofeng , Wu Kan , Cai Minglu , Li Chao , Chen Jianping
Published: September 2020

A Lidar system based on lens assisted two-dimensional beam steering at 1550nm is demonstrated. The Lidar has 19m measurement distance and 4*4 scanning points, indicating the potential of integrated beam steering technology for Lidar applications.
Efficient Chirp-Assisted SRS in H2-Filled Hollow-Core PCF for Generation of Ultrashort LP01 Pulses at 1.8 μm
Authors: Loranger Sébastien , Novoa David , Russell Philip St.J.
Published: September 2020

Sub-40 fs pulses at 1.8 pm are generated by pumping H2-filled hollow-core PCF with 300 fs, 1.03 pm fiber laser pulses pre-chirped to a duration of 640 fs. Conversion efficiencies of 50% are obtained.
Second Harmonic Generation in Directly-Grown MoS2/WS2 Heterostructures
Authors: Ore Alexandre S. M. V. , Vianna Pilar G. , Safeer Syed Hamza , Gordo Vanessa O. , Carvalho Isabel C. S. , Carozo Victor , de Matos Christiano J. S.
Published: September 2020

We report on second harmonic generation from MoS2/WS2 as-grown heterostructures. The two crystal structures naturally align with 0° and ^60. twist angles. While the former enhances, the latter decreases the nonlinearity from individual layers.
Nanoscale Laser Terahertz Emission Microscopy and THz Nanoscopy
Authors: Pizzuto Angela , Mittleman Daniel M. , Klarskov Perniile
Published: September 2020

We compare near-field tip-based Terahertz Time-Domain Spectroscopy and Laser Terahertz Emission Microscopy. We quantitatively determine each technique’s spatial field confinement and adapt the finite dipole model for applicability to both techniques.
Pulse compression to 3-cycle duration beyond 300 W average power
Authors: Nagy Tamas , Hädrich Steffen , Simon Peter , Blumenstein Andreas , Walther Nico , Klas Robert , Buldt Joachim , Stark Henning , Breitkopf Sven , Jójárt Péter , Seres Imre , Várallyay Zoltán , Eidam Tino , Limpert Jens
Published: September 2020

We generate multi-mJ, 10fs pulses at average powers beyond 300W by 30-times compression of the output of an Yb-fiber CPA in a 6m long stretched capillary. Further up-scaling of the parameters is in progress.
Compression of high-energy Ti:sapphire laser pulses to sub-2-cycle duration
Authors: Nagy Tamas , Kretschmar Martin , Rouzée Arnaud
Published: September 2020

We generate 6.3mJ, sub-5fs pulses by compressing high-energy Ti:Sapphire laser pulses in a 3.75m long stretched capillary.
Angular Dispersion Compensation Scheme for the Idler of Broadband Optical Parametric Amplifiers
Authors: Çankaya Hüseyin , Cirmi Giovanni , Krogen Peter , Calendron Anne-Laure , Debord Yi HuaBenoit , Gérôme Frédéric , Benabid Fetah , Kartner Franz X.
Published: September 2020

We demonstrate a technique for compensation of the idler angular chirp from an optical parametric amplifier in non-collinear geometry. This method enables generating broadband CEP- stable pulses for seeding high-energy optical parametric amplifiers.
Spectral and Temporal Control of Resonant Dispersive Wave Emission in Hollow Capillary Fibres Using Pressure Gradients
Authors: Brahms Christian , Belli Federico , Travers John C.
Published: September 2020

We demonstrate that resonant dispersive wave emission in hollow capillary fibres filled with a gas pressure gradient results in fast spectral tuneability and the generation of near transform-limited UV pulses.SM2H.5
Silicon Microring Modulator Driven by Transparent Conductive Oxide Capacitor
Authors: Li Erwen , Zhou Bokun , Hsu Wei-Che , Wang Alan X.
Published: September 2020

We experimentally demonstrated a novel silicon microring modulator driven by transparent conductive oxide capacitor, achieving a large tuning efficiency of 95 pm/V. Analysis indicates that a potential high-speed operation above 44GHz can be reached.
The impact of laser frequency noise on high-extinction optical modulators
Authors: West Gavin N. , Loh William , Kharas Dave , Ram Rajeev J.
Published: September 2020

We discuss the effects of laser frequency noise on the extinction ratio of typical integrated filters and amplitude modulators. It is shown that, even for spectrally-pure lasers, this noise inhibits realization of high extinction ratios.
Learning-Supported Full-Color Cell Imaging Through Disordered Optical Fiber
Authors: Hu Xiaowen , Zhao Jian , Fan Shengli , Antonio-Lopez Jose Enrique , Correa Rodrigo Amezcua , Schülzgen Axel
Published: September 2020

Full-color artifact-free cell image transport through an 80 cm disordered optical fiber is demonstrated for the first time using a learning-based wide-field configuration. Incoherent broadband light from a halogen lamp is used for illumination.
THz emitting nonlinear metasurface Fresnel zone plates
Authors: Minerbi Eviatar , Keren-Zur Shay , Ellenbogen Tal
Published: September 2020

We introduce a nonlinear metasurface that generates broadband terahertz radiation and focuses each frequency to a different focal point. This demonstration advances the development of efficient optical devices for the terahertz spectral region.
Electrically Tunable Terahertz Plasmonic Metasurfaces Employing Multilayer Graphene
Authors: Li Geng , Semenenko Viacheslav , Perebeinos Vasili , Liu Peter Q.
Published: September 2020

We demonstrate electrically tunable terahertz metasurfaces employing multilayer graphene realized by repeated transfer and stacking of monolayer graphene. Such multilayer graphene plasmonic structures exhibit significant increase of plasmonic resonance frequency compared to monolayer graphene structures.
Single-Shot Ultrafast Pulse Reconstruction with Deep Learning
Authors: Ziv Ron , Dikopoltsev Alex , Zahavy Tom , Rubinstein Ittai , Sidorenko Pavel , Cohen Oren , Segev Mordechai
Published: September 2020

We propose a simple all-in-line single-shot scheme for diagnostics of ultrashort laser pulses. consisting of a multi-mode fiber and a x(2) nonlinear crystal. Complete pulse characterization is done from the measurements using Deep Learning methods.
Real-time optical vector network analyzer based on coherent time-stretch
Authors: Li Lun , Xu Liang , Zhang Lei , Duan Yuhua , Li Yaoshuai , Yang Ningning , Zhang Chi , Zhang Xinliang
Published: September 2020

An ultrafast optical vector network analyzer (OVNA) based on dispersive time-stretch and digital coherent detection is proposed and experimentally demonstrated, and it successfully characterizes a micro-ring cavity with 20-hfflz frame rate and over 12-nm bandwidth.
Real-time, in-situ monitoring of Gamma radiation effects in packaged silicon photonic chips
Authors: Du Qingyang , Michon Jérôme , Li Bingzhao , Kita Derek , Ma Danhao , Zuo Haijie , Yu Shaoliang , Gu Tian , Agarwal Anuradha , Li Mo , Hu Juejun
Published: September 2020

We measured in-situ gamma radiation effect and post-radiation relaxation behavior on packaged SiC integrated photonic devices. A method to deconvolve the radiation responses from constituent materials was also proposed and validated.
Cryogenic Second Harmonic Generation in Periodically-Poled Lithium Niobate Waveguides
Authors: Bartnick Moritz , Santandrea Matteo , Hopker Jan Philipp , Thiele Frederik , Ricken Raimund , Quiring Viktor , Eigner Christof , Silberhorn Christine , Bartley Tim J.
Published: September 2020

We demonstrate type-II SHG in fiber-coupled periodically-poled lithium niobate waveguides down to 4.4 K. This is the lowest temperature SHG experiment in an integrated photonic circuit, which is also compatible with other low temperature photonic technologies.
Towards a Hexagonal SiGe Semiconductor Laser.
Authors: Tilburg M.A.J.v. , Dijkstra A. , Fadaly E.M.T. , Lange V.T. v. , Verheijen M. A. , Suckert J.R. , Rodl C. , Furthmuller J. , Bechstedt F. , Botti S. , Busse D. , Finley J.J. , Bakkers E.P.A.M. , Haverkort J.E.M.
Published: September 2020

Hexagonal SiGe is shown to feature a direct bandgap with a radiative strength comparable to InP. Surprisingly, it features a temperature independent emission strength, thus promising a silicon compatible laser tunable from 1.8 to 3.5 pm.
Schottky-Junction-based Near-Infrared Sub-Bandgap Organic Photodetectors with Coherent Perfect Absorption
Authors: Jin Yeonghoon , Kim Hyung Suk , Yoo Seunghyup , Yu Kyoungsik
Published: September 2020

We demonstrate Schottky-junction-based near-infrared sub-bandgap organic photodetectors operating up to 1300 nm. Coherent perfect absorption mechanism improves broadband optical absorption over wide incident angles with a responsivity of 0.88 pA/W at 975 nm.
Plasmon-enhanced graphene photothermoelectric detector
Authors: Wang Di , Llacsahuanga Allcca Andres E. , Chung Ting-Fung , Kildishev Alexander V. , Chen Yong P. , Boltasseva Alexandra , Shalaev Vladimir M.
Published: September 2020

We enhance the graphene photothermoelectric effect by overlaying an electrically- controlled graphene p-n junction with a gap-plasmon structure, and demonstrate a responsivity 25 times greater than that obtained without plasmonic and junction enhancements.
Field Trials of Photonics Based Terahertz Non-Destructive Testing Technologies
Authors: Park Kyung Hyun , Lee Eui Su , Kim Mugeon , Moon Kiwon , Park Dong Woo , Shin Jun-Hwan , Lee Dong Hun , Choi Da-Hye , Choi Kyung Sun , Kim Hyun-Soo , Lee Il-Min
Published: September 2020

In this study we present our recent achievements in industrial applications of terahertz technology: Cost-effective high-speed reflective imaging nondestructive testing (NDT) system, real-time thickness monitoring system of slurry film, and other recent works.
Measuring ultraviolet, femtosecond pulses in a medium with a slow response
Authors: Jones Travis , Peters William , Efimov Anatoly , Yarotski Dmitry , Sandberg Richard , Trebino Rick , Bowlan Pamela
Published: September 2020

We demonstrate that with transient grating, ultraviolet pulse shapes can be encoded in near-infrared nonlinear optical signals, even in a non-instantaneous medium. We present measurements of chirped 400 nm pulses made in an absorbing medium.
Ultra-efficient and highly tunable frequency conversion in Z-cut periodically poled lithium niobate nanowaveguides
Authors: Chen Jia-Yang , Tang Chao , Ma Zhaohui , Li Zhan , Sua Yong Meng , Huang Yu-Ping
Published: September 2020

We demonstrate ultra-efficient (~ 1900 ± 500%W-1 cm-2) and highly tunable (~ 1.71 nm/K) second harmonic generation from 1530 to 1583 nm via type-0 phase matching in Z-cut periodically poled lithium niobate nanowavguides.
Waveguide-Integrated Superconducting Nanowire SinglePhoton Detector Array for Ultra-Fast Quantum Key Distribution
Authors: Wolff Martin A. , Beutel Fabian , Häußler Matthias , Gehring Helge , Stegmüller Robin , Walter Nicolai , Hartmann Wladick , Tillmann Max , Wahl Michael , Röhlicke Tino , Bülter Andreas , Wernicke Doreen , Perlot Nicolas , Rödiger Jasper , Pernice Wolfram H. P. , Schuck Carsten
Published: September 2020

We present an array of 16 superconducting nanowire single-photon detectors made from NbTiN thin films on Si3N4-waveguides that we interface with 3D printed couplers providing wide transmission bandwidth.
High Energy Raman Solitons in Multimode GRIN Fibers
Authors: Zitelli M. , Mangini F. , Kharenko D.S. , Niang A. , Wabnitz S.
Published: September 2020

We experimentally demonstrate the fission of femtosecond pulses in a GRIN standard fiber, leading to high-energy multimode solitons that undergo huge Raman frequency shifts, and exhibit complex multisoliton dynamics.