bluuebunny/crossref_metadata_2025 huggingface dataset:
Inverse Geometric Design of Fabrication-Robust Nanophotonic Waveguides
Authors: Zhu Ziwei , Dave Utsav D. , Lipson Michal , Zheng Changxi
Published: September 2020

We present an inverse design method making waveguides with high performance and high robustness to fabrication errors. As an example, we show a 1-to-4 mode converter with > -1.5 dB conversion efficiency under geometric variations within fabrication tolerances.
An All-Optical Wavelength-Selective O-band Chip-Scale Silicon Photonic Switch
Authors: Hirokawa Takako , Netherton Andrew , Saeidi Mitra , Andrade Hector , Theogarajan Luke , Bowers John E. , Saleh Adel A.M. , Schow Clint L.
Published: September 2020

The first chip-scale wavelength-selective silicon photonic switch in the O-band is demonstrated. We describe the design and report results from the crossbar switch, which utilizes three pairs of microring resonators per crossing for wavelength selectivity.
Backwards Lasing from Krypton in Atmospheric Air
Authors: Dogariu Arthur , Miles Richard B.
Published: September 2020

We present first evidence of backwards lasing from Krypton present in atmospheric air. Two-photon femtosecond UV excitation leads to stimulated emission at 759nm. The air laser can be used for standoff detection.
Sensitive Trace Gas Detection Based on Quartz-enhanced Photothermal Spectroscopy
Authors: Ma Yufei , Hu Yinqiu , Qiao Shunda , He Ying , Tittel Frank K.
Published: September 2020

An ultra-high sensitive trace gas sensing method based on quartz-enhanced photothermal spectroscopy (QEPTS) with significant advantages of standoff and remote sensing ability will be reported.
Wide-band Millimeter-wave Synthesizer by Integrated Microcomb Photomixing
Authors: Zang Jizhao , Briles Travis C. , Morgan Jesse S. , Beling Andreas , Papp Scott
Published: September 2020

We demonstrate a wideband and tunable millimeter-wave synthesizer, using microcomb photomixing. For example, we generate a 150.8 GHz signal with Allan deviation of ~ 3 X 10_12/s. Our microcomb system supports a continuous range of 0.05-1 THz.
Ultra-efficient RF photonics filter based on an AlGaAs-on- insulator integrated Kerr frequency comb source
Authors: Shu Haowen , Tao Yuansheng , Xie Weiqiang , Chang Lin , Jin Warren , Deng Jiangrui , Jin Ming , Wang Xingjun , Bowers John. E.
Published: September 2020

We demonstrate an efficient RF photonics filter based on AlGaAs-on-insulator integrated comb. With a record low on-chip pumping power of —20 mW, the reconfigurable filter achieves a main-to-secondary sidelobe ratio of > 25 dB.
Design Chip-Scale Integration of Tunable Short-Wavelength Photonic Devices
Authors: Chung Kunook , Pandey Ayush , Sarwar Tuba , Aiello Anthony , Mi Zetian , Bhattacharya Pallab , Ku Pei-Cheng
Published: September 2020

Semiconductor heterostructures capable of producing a broadband gain in the short- wavelength (UV-purple-blue) spectrum for light emitters and detectors have been designed and experimentally studied.
Photonic integrated circuit based beam combining for future direct diode laser systems
Authors: Zeng Siwei , Zhu Yeyu , Zhao Xiaolei , Wu Ying , Sweatt Lance , Zhu Lin
Published: September 2020

We demonstrate photonic integrated circuit (PIC) based beam combining methods for futtrre direct diode laser systems. Both coherent and wavelength beam combining are realized through hybrid integration of gain chips with PICs.
Ytterbium-doped fiber with tapered core and uniform cladding
Authors: Lin Xianfeng , Cheng Yongshi , Wang Yibo , Chu Yingbo , Liao Lei , Li Jinyan
Published: September 2020

We report an Yb-doped fiber with tapered core and uniform cladding. A 364 W laser output was observed in MOPA structure. The laser slope efficiency was measured to be 71.11% and M2 factor was 1.63.
Broadband Epsilon-Near-Zero Behavior in Deep-etched Grating Metasurfaces
Authors: Palei Milan , Haug John , Shrout Joshua D. , Bohn Paul W. , Hoffman Anthony J.
Published: September 2020

In this work, we experimentally demonstrate coupling between free-space light and surface plasmon and epsilon-near-zero modes on Ag grating metasurfaces.
Temperature Dependent Sellmeier Equations for III-V Semiconductors GaN, GaP, GaAs, GaSb, InAs and InSb
Authors: Guha Shekhar , Wei Jean , Murray Joel M.
Published: September 2020

Recent measurement of refractive indices of binary III-V semiconductors GaN, GaP, GaAs, GaSb, InAs and InSb over temperature range of 77 - 400 K and wavelength range spanning the transmission window of each will be presented.
1.3 qm tunable quantum dot lasers
Authors: Wan Yating , Zhang Sen , Norman Justin , Kennedy MJ , He William , Tong Yeyu , Shang Chen , He Jian-Jun , Tsang Hon Ki , Gossard Arthur C. , Bowers John E.
Published: September 2020

We report the first directly modulated single-mode tunable quantum dot lasers at 1.3 pm. 27-channel wavelength switching was achieved with side-mode-suppression-ratio of around 35 dB without requiring nonuniform gratings or epitaxial regrowth.
Optical Frequency Comb Based on Cr:ZnS Laser
Authors: Vasilyev S. , Smolski V. , Peppers J. , Moskalev I. , Mirov M. , Fedorov V. , Barnakov Y. , Mirov S. , Gapontsev V.
Published: September 2020

We report mid-IR frequency comb with 3.25 W average power and spectrum spanning 60 THz near 2.4 pm. We stabilized the offset frequency of the comb with accumulated phase error of 75 mrads.
Ultrastable THz Wave Generation using a Soliton Microcomb
Authors: Zhang Shuangyou , Silver Jonathan M. , Shang Xiaobang , Del Bino Leonardo , Ridler Nick M. , Del’Haye Pascal
Published: September 2020

We demonstrate the generation of highly stable THz-waves using a microresonator-based optical frequency comb. The compact chip-based photonic THz source is characterized for ultra-low phase noise operation. Potential applications range from telecommunication systems to THz-spectroscopy.
Yb.CALGO Oscillator Generates 31-fs Pulses with 389 mW at 29% Efficiency by Cross-Polarized Optical Pumping
Authors: Labaye François , Wittwer Valentin J. , Modsching Norbert , Razskazovskaya Olga , Cormier Eric , Südmeyer Thomas
Published: September 2020

Standard collinear pumping of Yb-oscillators with dichroic mirrors severely limits operation at minimum pulse-duration due to dispersion and losses. A novel pumping scheme enables substantially higher efficiency, opening new opportunities for compact high-power few-cycle Yb- oscillators.
A SESAM-like Device Operating beyond 3 Micron
Authors: Meng Yafei , Yang Yunkun , Zhao Xinchao , Xu Yongbing , Wang Shaowei , Xiu Faxian , Shi Yi , Wang Fengqiu
Published: September 2020

We have for the first time demonstrated a SESAM-like device operating beyond 3 micron. The SESAM-like device is comprised of a highly-reflective Si/SiO Bragg reflector, a Dirac semimetal thin film absorber and a mica substrate as the passivation layer.
Platform for ultra-strong modulation in hybrid silicon nitride/2D material photonic structures
Authors: Datta Ipshita , Chae Sang Hoon , Lee Brian S. , Li Baichang , Hone James , Lipson Michal
Published: September 2020

We demonstrate a platform for ultra-strong optical modulation in hybrid silicon nitride (SiN)/2D waveguides, by leveraging the gate dependent absorption modulation in graphene and the strong electrorefractive effects in monolayer TMDs.
Disentanglement of Heat and Carrier Transfer Effects in WS2/Graphene Heterostructure Under Near-infrared Laser Excitation
Authors: Zhang Ruiling , Gan Lin , Zhang Danyang , Feng Jiabin , Ning Cun-Zheng
Published: September 2020

Combined photoluminescence and Raman spectroscopies of WS2/grapheme heterostructure through pump-power and temperature controls show that redshift of photoluminescence is mainly caused by pump induced heating, while linewidth-broadening has contributions from both heating and carrier transfer. © 2020 The Author(s)
Generation and heterodyne detection of a 2-μm-band 16-QAM signal based on inter-band wavelength conversion
Authors: Liu Yong , Kong Deming , Ren Zhengqi , Jung Yongmin , Pu Minhao , Yvind Kresten , Galili Michael , Oxenlowe Leif K , Richardson David J , Hu Hao
Published: September 2020

We demonstrate the generation and self-heterodyne detection of a 2-pm-band 32-Gbit/s line-rate 16-QAM signal based on inter-band wavelength conversion in an AlGaAsOI nanowaveguide. Error-free performance is achieved using LDPC codes with 33% overhead.
All-optical frequency hopping and broadcasting in wavelength-multiplexed channels
Authors: Lukens Joseph M. , Lu Hsuan-Hao , Qi Bing , Lougovski Pavel , Weiner Andrew M. , Williams Brian P.
Published: September 2020

We demonstrate all-optical routing of wavelength-multiplexed fiber-optic data streams. Utilizing an all-optical frequency processor, we show low-noise broadcasting and carrier-frequency hopping of binary data without optical-to-electrical conversion.
End-to-end optimized nonlinear Fourier transform-based coherent communications
Authors: Gaiarin Simone , Jones Rasmus T. , Da Ros Francesco , Zibar Darko
Published: September 2020

We propose a jointly optimized nonlinear Fourier transform (NFT)-based transmitter and neural network-based receiver. More than two orders of magnitude improvement in bit error ratio is numerically reported for 5600-km transmission compared to a standard NFT system. © 2020 The Author(s)
Dual-Comb Photoacoustic Spectroscopy
Authors: Wildi Thibault , Voumard Thibault , Brasch Victor , Yilmaz Gürkan , Herr Tobias
Published: September 2020

Photoacoustic dual-comb spectroscopy is demonstrated, providing scan-free mapping of optical absorption spectra to acoustically detectable frequencies. Narrow absorption features of a low volume gas sample are resolved with high signal-to-noise ratio in short acquisition time.
Broadband Mid-infrared Trace Gas Sensor Based on a Supercontinuum Source and Lock-in Detection
Authors: Jahromi Khalil Eslami , Khodabakhsh Amir , Nematollahi Mohammadreza , Pan Qing , Harren Frans J.M.
Published: September 2020

We present a mid-infrared supercontinuum-based trace gas sensor. A lock-in technique is applied to enhance the signal-to-noise ratio by over an order of magnitude, achieving a sensitivity of ~10 ppbv Hz-1/2 for the detection of methane.
Single nanoparticle detection with CMOS-compatible heterodyne interferometry
Authors: Jin Ming , Tang Shui-Jing , Shu Hao-Wen , Tao Yuan-Sheng , Wang Xing-Jun , Xiao Yun-Feng
Published: September 2020

We introduce a CMOS-compatible waveguide interferometry for single nanoparticle detection using optical dark-field scattering and heterodyne technique. The integrated sensor is capable of detecting single 40-nm-radius nanoparticles with a signal-to-noise ratio of 13 dB.
Low-Noise Balanced Photoreceiver with Waveguide SiN Photodetectors and SiGe TIA
Authors: Costanzo Robert , Yu Qianhuan , Shen Xiaochuan , Gao Junyi , Beling Andreas , Bowers Steven M.
Published: September 2020

A photoreceiver with balanced SiN waveguide photodetectors and BiCMOS transimpedance amplifier is proposed, achieving a high conversion gain of greater than 2 kV/W up through 2 GHz, and a low in-band NEP of 8 pW/^Hz.
Machine Learning with Integrated Metasystem
Authors: Wang Zi , Chang Lorry , Wang Feifan , Li Tiantian , Gu Tingyi
Published: September 2020

We utilize machine learning algorithm to design integrated photonic meta-systems, and experimentally demonstrated the device performance.
Giant Brillouin amplification in gas using hollow-core waveguides
Authors: Yang Fan , Gyger Flavien , Thevenaz Luc
Published: September 2020

We report a strong Brillouin amplification in g as u sing h ollow-core fibers, exceeding by 6 times the gain in solid silica fibers. A novel fiber laser using Brillouin lasing in gas has been demonstrated.
Hollow core fiber Fabry-Perot interferometers with finesse over 3000
Authors: Ding Meng , Numkam Fokoua Eric. R. , Bradley Thomas D. , Poletti Francesco , Richardson David J. , Slavik Radan
Published: September 2020

We investigate the limits to achievable finesse in hollow core fiber Fabry-Perot interferometers due to loss at the interferometer mirrors. We predict that finesses > 6000 is achievable and demonstrate a value of >3000 experimentally.
Growth of Ammonium Chloride on Cleaved End-Facets of Hollow Core Fibers
Authors: Rikimi Shuichiro , Chen Yong , Partridge Matthew C. , Bradley Thomas D. , Davidson Ian A.K. , Taranta Austin A. , Poletti Francesco , Petrovich Marco N. , Richardson David J. , Wheeler Natalie V.
Published: September 2020

The contamination found on the cleaved end-facet of a hollow core fiber is identified as ammonium chloride. Through observations made under different experimental conditions we identify the likely contamination source and means to remove it.
High-birefringence hollow-core anti-resonant fiber
Authors: Hong Yi-Feng , Gao Shou-Fei , Ding Wei , Wang Ying-Ying , Wang Pu
Published: September 2020

We report the first high-birefringence hollow-core anti-resonant fiber with a pseudoCv symmetry. The resulted fiber shows a phase birefringence, polarization etfinction ratio, and loss of 0.9 X10-4, 25 dB, and 250 dB/km, respectively, at 1550 nm.
3D laser printing: high resolution and throughput
Authors: Juodkazis Saulius
Published: September 2020

A GHz-burst ablation rate using fast scan of ultra-short laser pulses depends on pulse fluence [J/cm2] as F^ due to strong absorption within the skin depth of photo-excited material. The very same phenomenon of shallow energy deposition is responsible for polymerisation using fast 1 cm/s scan of ultra-short laser pulses.
Transmission Metalens with Fixed-Gap Nanopillars for Immersion Lithography Patterning on 12-inch Glass Wafer
Authors: Fu Yuan Hsing , Li Nanxi , Zhong Qize , Dong Yuan , Hu Ting , Li Dongdong , Xu Zhengji , Zhou Yanyan , Lai Keng Heng , Bliznetsov Vladimir , Lee Hou-Jang , Loh Wei Loong , Zhu Shiyang , Lin Qunying , Singh Navab
Published: September 2020

Metalens with fixed-gap nanopillars release fabrication challenges in photolithography on CMOS platform. Their performances are investigated through simulation, and the characterization results of metalens patterned directly on 12-inch glass-wafer via immersion lithography are presented.
Measuring non-equilibrium and temperature-dependent thermal emitters
Authors: Xiao Yuzhe , Wan Chenghao , Shahsafi Alireza , Salman Jad , Yu Zhaoning , Wambold Raymond , Mei Hongyan , Rubio Perez Bryan E. , Yao Chunhui , Kats Mikhail A.
Published: September 2020

We describe and demonstrate general procedures for thermal-emission measurements that are applicable to most experimental conditions, including more-challenging cases such as thermal emitters with temperature-dependent emissivity and emitters that are not in thermal equilibrium.
Optical Frequency Divider for Spectroscopy and Optical Frequency Measurement
Authors: Jiang Yanyi , Yao Yuan , Li Bo , Chen Xiaotong , Sun Yuxin , Hao Yaqin , Ma Longsheng
Published: September 2020

We discuss an accurate multi-channel optical frequency divider based on an optical frequency comb, which enables accurate optical frequency measurement and optical frequency synthesis for laser spectroscopy.
Dual-Comb Thin-Disk Laser Oscillator Based on Polarization Splitting
Authors: Modsching Norbert , Drs Jakub , Fischer Julian , Schilt Stéphane , Wittwer Valentin J. , Südmeyer Thomas
Published: September 2020

We present the first dual-comb thin-disk laser based on polarization splitting. It generates 6-W and 8-W outputs of 240-fs pulses with adjustable repetition rate. We investigate noise properties and demonstrate a proof-of-principle spectroscopy experiment.
Directly Diode-Pumped Few-Optical-Cycle Cr:ZnS Laser at 800 mW of Average Power
Authors: Nagl Nathalie , Grobmeyer Sebastian , Potzlberger Markus , Pervak Vladimir , Krausz Ferenc , Mak Ka Fai
Published: September 2020

We report a Kerr-lens mode-locked Cr:ZnS oscillator directly pumped by two laser diodes, providing 34 fs pulses with 800 mW average power at 2.4 pm. This low-noise affordable femtosecond laser facilitates numerous emerging mid-infrared applications.
Carrier to Envelope Phase (CEP) Stable, 2.37pm, Ultrashort Cr:ZnSe Laser.
Authors: Komm Pavel , Sheintop Uzziel , Noach Salman , Marcus Gilad
Published: September 2020

Cr:ZnSe laser amplifier resulted more than 40 uJ , 72fs pulses, at X0 ~ 2375nm. The CEP stability of the parametrically generated seed stands firm through 6 orders of magnitude of amplification.
Realization of robust optical physical unclonable function using a silicon photonic quasicrystal interferometer
Authors: Tarik Farhan Bin , Famili Azadeh , Lao Yingjie , Ryckman Judson D.
Published: September 2020

We report the first optical physical unclonable function designed for robustness against fluctuations in optical angular/spatial alignment, polarization, and temperature, and introduce silicon photonic quasicrystal interferometry for secure hardware applications.
Photonic-crystal Scintillators for Enhancing X-ray and Gamma-ray Detection
Authors: Kurman Yaniv , Dahan Raphael , Kaminer Ido
Published: September 2020

Scintillator materials are ubiquitous in detectors of high-energy photons. We show that their efficiency can be enhanced using the Purcell effect in nanophotonics and exemplify the concept with designs of photonic crystals made from scintillator materials.
Flexible Photonics Based on Whispering-Gallery-Mode Resonators and Liquid-Crystal-Elastomers
Authors: Woska Simon , Karayel Osman , Rietz Pascal , Hessenauer Jannis , Oberle Roman , Kaiser Evelyn , Pfleging Stefan , Klusmann Carolin , Siegle Tobias , Kalt Heinz
Published: September 2020

Liquid-Crystal-Elastomers were integrated into building blocks containing Whispering- Gallery-Mode resonators. Exploiting their directional mechanical actuation, full tunability of single cavities and flexible coupling of resonator pairs were realized and verified by fibertransmission spectroscopy.
100-Gb/s PAM-4 Transmission for Next-Generation Optical Access Networks Using a Silicon Micro-Ring Resonator
Authors: Zhang Xiaoling , Ding Yunhong , Li Longsheng , Jin Wei , Zhang Chongfu , Qiu Kun , Hu Hao
Published: September 2020

We experimentally demonstrated 100-Gb/s PAM-4 signal transmission over 25-km SSM using a 10-G class DM,. A polarization-diversity silicon micro-ring resonator is employed to enhance the dispersion tolerance and extinction ratio in the DM based IM/DD system.
C-band 4x150 Gbit/s PAM8 transmission over 30 km SSMF using direct detection without CD compensation
Authors: Li Di , Cheng Wen , Song Haiping , Deng Lei , Cheng Mengfan , Fu Songnian , Tang Ming , Liu Deming
Published: September 2020

We demonstrated 4*150Gbit/s PAM8 signal transmission system using dual-drive MZM and direct-detection for the first time. By optimizing the Volterra equalizer, 30km SSMF without CD compensation is achieved with BER below HD-FEC limit of 3.8* 10-3.
Novel Measurement Method of Fiber-Birefringence Spatial Distribution by Coherent Heterodyne Detection of Rayleigh Backscattered Light
Authors: Takei Nanako , Ryu Shiro
Published: September 2020

Theory of fiber-birefringence spatial distribution measurement is established by measurement of optical phase of Rayleigh backscattered light with coherent heterodyne detection. Measurement results agree well with the results using polarization optical time domain reflectometry.
Nanorod-cladding sapphire fiber for continuous temperature measurement in molten steel
Authors: Qian Jingjing , Zhao Zijian , Zhang Qinming , Lu Meng , Abraham Sunday , Werner Matthew , Petty Randy
Published: September 2020

This paper reports a new optical fiber thermometer (OFT) for temperature measurement under extreme environments, such as in molten steels. The OFT probe consists of a ceramic tube and a sapphire fiber, which is coated with a nanorod cladding layer. Installed inside the ceramic tube, the nanorod-cladding sapphire fiber can collect thermal emissions of the ceramic tube and couple the emission out of the OFT probe to a near-infrared spectrometer with minimal loss of photons. The molten steel temperature was determined by analyzing the emission spectra using a polynomial curve fitting or a machine learning-based classification algorithm.
Efficient DFG via Large Effective x2 in Monolithic Diode Lasers
Authors: Iu Meng Lon , Zareian Nima , Janjua Bilal , Charles Paul , Chen Eric , Helmy Amr S.
Published: September 2020

Diode lasers with effective x2 nonlinearity of 36 pm/V are designed and fabricated for facilitating phase-matching and on-chip pumping of parametric processes. A record DFG conversion efficiency of 169%W-1cm-2 is demonstrated with tuning over 200 nm.
Quarter Watt 2-octave Wide Mid-IR Frequency Comb from a Subharmonic OPO Based on OP-GaP Crystal
Authors: Ru Qitian , Kawamori Taiki , Schunemann Peter G. , Vasilyev Sergey , Mirov Sergey B. , Vodopyanov Konstantin L.
Published: September 2020

We used a dispersionless-cavity subharmonic OPO pumped by femtosecond 2.35-pm pulses to demonstrate a coherent output spanning 3-12pm with up to 245-mW power. We also compare the performance of the OP-GaP vs OP-GaAs crystal.
Dither-Free Stabilization of a Femtosecond Doubly- Resonant OPO Using Parasitic Sum-Frequency Mixing
Authors: Cheng Yuk Shan , McCracken Richard A. , Reid Derryck T.
Published: September 2020

A new stabilization paradigm for degenerate femtosecond OPOs is demonstrated in a Ti:sapphire-pumped PPKTP OPO. Based on parasitic sum-frequency mixing, the approach achieves long-term locking and a tenfold reduction in relative-intensity noise compared with dither-locking.
Backward Terahertz-Wave Parametric Oscillator with Optical Injection Seeding
Authors: Takida Yuma , Nawata Kouji , Minamide Hiroaki
Published: September 2020

Continuous-wave injection seeding of a subnanosecond backward terahertz-wave parametric oscillator based on slant-strip-type periodically poled lithium niobate is demonstrated. Enhancement of pump-to-idler conversion efficiency up to 39% is achieved by seeding for forward-propagating idler wave.
Electro-optic spectral switching in multiline optical parametric oscillators using aperiodic optical superlattice lithium niobate
Authors: Wang Tai-Jie , Chung Hung-Pin , Deng Lin-Ming , Chan Wei-Kun , Pham Tien-Dat , Geiss Reinhard , Pertsch Thomas , Chen Yen-Hung
Published: September 2020

We demonstrate an electro-optically switchable multi-wavelength optical parametric oscillator (OPO) based on an aperiodically poled Li^D3 (APPLN). The OPO can radiate at 1540nm, 1550nm, or both wavelengths simply by switching the voltage on the APPLN.
Tunable Nonlinear Activation Functions for Optical Neural Networks
Authors: Williamson Ian A. D. , Hughes Tyler W. , Minkov Momchil , Bartlett Ben , Pai Sunil , Fan Shanhui
Published: September 2020

We introduce an electro-optic hardware platform for realizing optical nonlin earities and demonstrate that, as a nonlinear activation function, it can substantially improve the classification performance of optical neural networks.
Digital Optical Neural Networks for Large-Scale Machine Learning
Authors: Bernstein Liane , Sludds Alexander , Hamerly Ryan , Sze Vivienne , Emer Joel , Englund Dirk
Published: September 2020

We propose a digital incoherent optical neural network architecture using the passive data routing and copying capabilities of optics for artificial neural network acceleration. We demonstrate a proof-of-concept experiment and analyze optimal use cases.
Topological Insulator-based Terahertz Emission with Manipulated Polarization (TI-TEMP)
Authors: Zhao Haihui , Chen Xinhou , Wang Hangtian , Wang Chun , Nie Tianxiao , Wu Xiaojun
Published: September 2020

Spin-polarized terahertz waves with arbitrarily tailored temporal shaping are successfully demonstrated in three-dimensional topological insulator Bi2Te3 when delicately controlling the incident femtosecond laser polarization and the sample azimuthal angle.
Terahertz quantum optics in the time-domain: from field correlation measurements on vacuum field fluctuations in free space towards cavity electro-optics
Authors: Benea-Chelmus Ileana-Cristina , Settembrini Francesca Fabiana , Salamin Yannick , Fedoryshyn Yuriy , Heni Wolfgang , Elder Delwin L. , Dalton Larry R. , Leuthold Juerg , Scalari Giacomo , Faist Jerome
Published: September 2020

The ground state of electromagnetic radiation is characterised by a fluctuating electromagnetic field even in a vacuum. We measure its correlation function as a function of time and space using the electro-optic effect. We determine the spectral content and the amplitude of this state and find excellent agreement with the second quatisation theory.
Side-effect free carrier-envelope frequency stabilization utilizing the Doppler effect
Authors: Rustige Pascal , Feng Tianli , Steinmeyer Günter
Published: September 2020

We experimentally demonstrate how the optical Doppler effect can be exploited to modulate the carrier-envelope frequency of a mode-locked laser without causing detrimental side-effects and without any intervention into the laser.
Doubly resonant photonic crystal cavity based on a bound state in the continuum for efficient second harmonic generation
Authors: Minkov Momchil , Fan Shanhui , Wang Jun , Hodre Romuald , Clementi Marco , Barone Andrea , Gerace Dario , Galli Matteo
Published: September 2020

Using the concept of bound states in the continuum, we design a photonic crystal cavity supporting two resonant modes separated by a full octave for efficient second- order nonlinear frequency conversion.
Controlling the temporal impulse response of light propagating through a multimode fiber
Authors: Mounaix Mickael , Carpenter Joel
Published: September 2020

We demonstrate how to control the polarization-resolved temporal impulse response of transmitted light through a multimode fiber. We show enhancing or attenuating the total temporal impulse response at arbitrary delays and polarization states.
Coherent control of light through laser written photonic lanterns
Authors: LP S. , McNicholl D. K. , Whyte G. , Birks T. A. , Thomson R. R , Phillips D. B.
Published: September 2020

We demonstrate coherent control of light through bespoke laser written photonic lanterns. This enables imaging in a variety of new situations, with potential applications to microendoscopy, chip-based LIDAR, and microfluidic imaging.
Coherence property of time-multiplexed degenerate optical parametric oscillator pulses generated using a nonlinear fiber Sagnac loop
Authors: Lo Hsin-Pin , Inagaki Takahiro , Honjo Toshimori , Takesue Hiroki
Published: September 2020

We generated time-multiplexed degenerate optical parametric oscillator pulses using a nonlinear fiber Sagnac interferometer. We confirmed that the phases of pulses were bifurcated to 0 or n, which makes them useful for simulating Ising spins.
Electro-optic frequency combs for atomic and physical metrology
Authors: Long David A , Reschovsky Benjamin J. , Zhou Feng , Bao Yiliang , Madugani Ramgopal , Fleisher Adam J. , Gorman Jason J. , LeBrun Thomas W.
Published: September 2020

Electro-optic frequency combs provide a powerful and agile platform for rapid sensing. We describe new approaches for the generation and application of these combs and utilize them in a range of metrological systems.
Mid-Infrared Comb-Based Fourier Transform Spectroscopy of Halogenated Volatile Organic Compounds
Authors: Sadiek Ibrahim , Hjältén Adrian , Stuhr Michael , Lu Chuang , Vieira Francisco Senna , Foltynowicz Aleksandra
Published: September 2020

Broadband high-resolution spectra of two key atmospheric species, methyl iodide (CH3I) and dibromomethane (CH2Br2), are measured around 3 ؛am using a comb-based Fourier transform spectrometer and assigned with the help of the semi-automatic fitting in PGOPHER.
Coherent Optical Clock Down-Conversion Realizing Microwaves With 10-18 Absolute Stability
Authors: Nakamura Takuma , Davila-Rodriguez Josue , Leopardi Holly , Sherman Jeff A. , Fortier Tara M. , Xie Xiaojun , Campbell Joe C. , Diddams Scott A. , McGrew Will , Zhang Xiaogang , Hassan Youssef , Nicolodi Daniele , Ludlow Andrew , Quinlan Franklyn
Published: September 2020

We generate 10-GHz microwaves, derived from independent Yb optical clocks, with 2.4*10-18 absolute fractional frequency stability, no significant offset at the 10-19 level, and femtosecond-precision transfer of the optical clock phase to the microwave domain.
Field-deployable Ultra-low-noise Clockwork for Precision Optical Clocks
Authors: Giunta Michele , Fischer Marc , Lilienfein Nikolai , Wolferstetter Martin , Holzberger Simon , Saint-Jalm Sarah , Skopnik Florian , Lessing Maurice , Hänsel Wolfgang , Holzwarth Ronald
Published: September 2020

We report the development of a field-deployable frequency comb operated as clockwork for transportable Sr-clocks. While referencing it at ~194.4THz, we characterize spectral lines at ~214.6THz. Prospects on complete Sr-lattice laser systems will be outlined.
Optical Beam Steering Using an NxN Phased Array with 2N Phase Shifters
Authors: Ashtiani Farshid , Aflatouni Firooz
Published: September 2020

A novel NxN optical phased array (OPA) with 2N phase shifters is proposed that significantly reduces power consumption and enables OP As with compact element spacing. 2-D beam steering with an 8x8 OP A using the proposed scheme is demonstrated.
Electro-Optical Phase-Locked Loop Generating Linear Frequency Chirp for FMCW LiDAR
Authors: Kondo Keisuke , Hashemi Hossein
Published: September 2020

We demonstrated linear frequency-chirp modulation using a wide-bandwidth analog electro-optical phase-locked loop, leveraging linear analog multipliers in a single sideband frequency down-conversion scheme, without electrical ramp generation, predistortion circuitry, or complex digital logic. © 2020 The Author(s)
Multi-Tone Continuous Wave Lidar in Simultaneous Ranging and Velocimetry
Authors: Bayer Mustafa Mert , Torun Rasul , Zaman Imam Uz , Boyraz Ozdal
Published: September 2020

We demonstrate simultaneous ranging and velocimetry measurements by using multitone continuous wave Lidar. We show >95% agreement with conventional time-of-flight Lidar technique in ranging and ±0.8cm/s accuracy in velocity measurements.
Raman Amplification of Charge-15 Orbital Angular Momentum Mode in a Large Core Step Index Fiber
Authors: Zhu Sheng , Pachava Srinivas , Pidishety Shankar , Feng Yutong , Srinivasan Balaji , Nilsson Johan
Published: September 2020

We report 9.2-dB Raman amplification of pulses at 1121 nm in an orbital angular momentum mode with charge 15 in 30 m of 50-pm-diameter step-index-core fiber. The amplified signal mode-purity is measured to 78.4%.
Time-Synchronized 3-Color Single-Aperture Fiber Sources via Soliton Self-Mode Conversion
Authors: Kabagöz Havva Begüm , Zhang Siyuan , Rishøj Lars , Antikainen Aku , Ramachandran Siddharth
Published: September 2020

We demonstrate a three-wavelength, time-synchronized, ultrashort (~90 fs), energetic (~6.5 nJ) pulse source from a single fiber aperture, uniquely enabled by the recently discovered process of soliton self-mode conversion.
Tunable infrared light emission from MoS2/WSe2 heterostructures
Authors: Karni Ouri , Barre Elyse , Lau Sze Cheung , Gillen Roland , Ma Eric Yue , Gal Lior , Yaffe Tzach , Kim Bumho , Watanabe Kenji , Taniguchi Takashi , Orenstein Meir , Maultzsch Janina , Barmak Katayun , Page Ralph H. , Heinz Tony F.
Published: September 2020

We report light emission around 1200 nm from a vertical heterostructure consisting of M0S2 and WSe2 monolayers. The emission, arising from the fundamental interlayer exciton, can be tuned by nearly 100 nm by electrical gating.
Reconstructing the Local Profile of Exciton Emission Wavelengths Across a WS2 Bubble
Authors: Zhang Danyang , Gan Lin , Zhang Jianxing , Zhang Ruiling , Wang Zhen , Feng Jiabin , Sun Hao , Ning Cun-Zheng
Published: September 2020

Exciton emission wavelengths on a bubble of 2D material are affected by local strain and dielectric environment. Such localized wavelength profile is reconstructed for a WS2 bubble smaller than wavelengths using AFM measured topography.
Polarization-Dependent Disappearance of THz Reflectance in an Aligned Carbon Nanotube Film
Authors: Baydin Andrey , Komatsu Natsumi , Ghosh Saunab , Makihara Takuma , Noe G. Timothy , Kono Junichiro
Published: September 2020

We have performed polarization-dependent terahertz time-domain spectroscopy measurements on a highly aligned film of single-wall carbon nanotubes and found that the terahertz pulse reflected from the substrate-film interface totally disappears at a specific polarization angle.
Hyperspectral THz Microscopy via Time-resolved Nonlinear Ghost Imaging
Authors: Totero Gongora Juan S. , Olivieri Luana , Peters Luke , Cecconi Vittorio , Cutrona Antonio , Tunesi Jacob , Tucker Robyn , Pasquazi Alessia , Peccianti Marco
Published: September 2020

We demonstrate a new type of nonlinear THz Ghost-Imaging technique combining nonlinear pattern generation and time-resolved single-pixel measurements. Our approach allows reconstructing the morphology and spectral features of complex samples with subwavelength resolution.
Terahertz Spectral Imaging Through Turbid Media: A Wavelet Approach to Scattering Mitigation
Authors: Khani Mahmoud E. , Harris Zachery B. , Arbab M. Hassan
Published: September 2020

Terahertz imaging often involves seeing through inhomogeneous and highly scattering media. We propose a wavelet multiresolution analysis approach to mitigate the scattering effects and produce highly-resolved reflection spectral images for chemical mapping through turbid media.
Terahertz Gas-phase Spectroscopy of CO using a Silicon-based Picosecond Impulse Radiator
Authors: Mehta Yash , Razavian Sam , Schwarm Kevin , Spearrin R. M. , Babakhani Aydin
Published: September 2020

A custom energy-efficient s ilicon i mpulse r adiator i s u sed as a s ource for THz spectroscopy of carbon monoxide (CO). Multiple absorption lines are measured across varying pressures and mixing ratios using a single broadband integrated source.
Optical time reverser
Authors: Mounaix Mickael , Fontaine Nicolas K. , Neilson David T. , Ryf Roland , Chen Haoshuo , Alvarado-Zacarias Juan Carlos , Carpenter Joel
Published: September 2020

We demonstrate how to generate arbitrary optical fields in the full C band (1535nm - 1570nm), by controlling simultaneously all the degrees of freedom of a light beam: spatial, polarization, spectral and temporal properties.
Surface-Acoustic-Wave Modulation of a Silicon-on-Insulator Defect Bragg Grating
Authors: Munk Dvir , Katzman Moshe , Hen Mint , Priel Maayan , Zadok Avi
Published: September 2020

A surface acoustic wave modulator is implemented in standard silicon-on-insulator. Acoustic waves are stimulated by absorption of pump light in metallic patterns and thermo-elastic expansion, and modulate probe light in a defect waveguide grating cavity.
Low power electro-optic SRAM based on negative differential resistance
Authors: Gherabli Rivka , Zektzer Roy , Grajower Meir , Shappir Joseph , Wofsy Menachem , Inbar Naor , Levy Uriel
Published: September 2020

We present a new electro-optics data storage device based on the combination of negative differential resistances and optical cavity, remarkable for its simplicity and its complete CMOS compatibility with power consumption around the nanoWatt.
Smartphone-based Optical Fiber Speckle Spectrometer
Authors: Tan Henry , Cadusch Jasper J. , Li Bingxi , Crozier Kenneth B.
Published: September 2020

We demonstrate a spectrometer that uses a smaityhone to image the speckle pattern produced by a multimode optical fiber. A smarjihone-based algorithm uses the measured pattern and a calibration library to determine the input spectnrm.
Long-range depth imaging with 13ps temporal resolution using a superconducting nanowire singlephoton detector
Authors: Taylor Gregor G , McCarthy Aongus , Korzh Boris , Beyer Andrew D , Morozov Dmitry , Briggs Ryan M , Allmaras Jason P , Bumble Bruce , Shaw Matthew D , Hadfield Robert H , Buller Gerald S
Published: September 2020

We demonstrate millimetre-scale depth imaging up to 325 meters by deployment of a novel superconducting nanowire single-photon detector with 13 ps F^M instrument response fmction at 1550 nm wavelength.
Massively parallel coherent LiDAR using dissipative Kerr solitons
Authors: Riemensberger Johann , Lukashchuk Anton , Karpov Maxim , Lucas Erwan , Weng Wenle , Liu Junqiu , Kippenberg Tobias J.
Published: September 2020

We demonstrate an architecture for massively parallel frequency-modulated continuous wave (FMCW) laser ranging (LiDAR) by transferring linear chirps of a single narrow linewidth laser onto all soliton comb teeth though generation of a dissipative Kerr soliton in an integrated Si3N4 microresonator.
A Pulsed-Optical Timing Distribution System for LCLS-II
Authors: Şafak Kemal , Droste Stefan , Cheng Haynes Pak Hay , Dai Anan , Gumerlock Karl , Berlin Andrej , Bhat Shashank , Neuhaus Mathias , Paradowski Julia , Okrent Frank , Schiepel Philipp , Fry Alan R. , Kärtner Franz X.
Published: September 2020

We present the technical design of the pulsed-optical timing distribution system for LCLS-II and characterize its performance with out-of-loop measurements indicating a long-term timing stability of one femtosecond.
Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers
Authors: Khan Saeed , Buckley Sonia M. , Chiles Jeff , Mirin Richard P. , Nam Sae Woo , Shainline Jeffrey M.
Published: September 2020

We demonstrate adiabatically tapered fibers clad with a higher-index material for coupling to an on-chip waveguide. The loss from fiber to a sub-micron waveguide in a packaged device is 1.3 dB, and the 3 dB bandwidth is is 90 nm.
Infrared Diffraction-Free Space-Time Light Sheets
Authors: Yessenov Murat , Ru Qitian , Schepler Kenneth L. , Meem Monjurul , Menon Rajesh , Vodopyanov Konstantin L. , Abouraddy Ayman F.
Published: September 2020

We report the demonstration of infrared diffraction-free space-time pulsed 1D light sheets. We achieved diffraction-free propagation for a 60-nm-bandwidth, 2.35 um central-wavelength, 300-um-FWHM beam up to 7 m, 80 x the corresponding Rayleigh range.
Single-Longitudinal-Mode Tunable Actively Q-switched 2 pm Tm:YAP Laser Using a Transversally Chirped Volume Bragg Grating
Authors: Berthomé Quentin , Grisard Arnaud , Faure Basile , Souhaité Grégoire , Lallier Eric , Melkonian Jean-Michel , Godard Antoine
Published: September 2020

A pulsed, single-longitudinal-mode, wavelength-tunable Tm:YAP laser was realized, delivering 270-pJ, 50-ns pulses with 1-kHz repetition rate. Spectral narrowing and tuning from 1940 to 1960 nm is carried out with a transversally chirped volume Bragg grating.
Growth, Spectroscopy and Laser Operation in Disordered Tm,Ho:Ca(Gd,Lu)A!O4 Crystals
Authors: Pan Zhongben , Loiko Pavel , Serres Josep Maria , Kifle Esrom , Yuan Hualei , Dai Xiaojun , Cai Huaqiang , Wang Yicheng , Zhao Yongguang , Sole Rosa Maria , AguilO Magdalena , Diaz Francesc , Camy Patrice , Dunina Elena , Kornienko Alexey , Griebner Uwe , Petrov Valentin , Mateos Xavier
Published: September 2020

We report on Czochralski growth, structure, spectroscopy and laser operation of tetragonal disordered calcium aluminate crystals, Tm,Ho:Ca(Gd,Lu)AlO4. The laser generates 763 mW at 2078.6 nm with a slope efficiency of 26.4% (tuning range: 212 nm).
Broadband Diffractive Neural Networks
Authors: Luo Yi , Mengu Deniz , Yardimci Nezih T. , Rivenson Yair , Veli Muhammed , Jarrahi Mona , Ozcan Aydogan
Published: September 2020

Broadband diffractive neural networks that process a continuum of wavelengths for task- specific component design and all-optical inference are presented. This framework is experimentally demonstrated by designing spectral filters and a spatially-controlled demultiplexer at THz wavelengths.
Characterization of High Harmonic Beam Profiles and Wavefronts with Ptychographic Imaging
Authors: Schmidt David D. , Ramlet Logan Z. , Wilhelm Alex M. , Adams Daniel E. , Durfee Charles G.
Published: September 2020

We use multi-modal ptychography to obtain harmonic-resolved beam profiles and wavefronts without grating dispersion. These beams can be back-propagated to the source to characterize the generation process.
Retrieving the Coherent Artifact with FROG
Authors: Escoto Esmerando , Jafari Rana , Trebino Rick , Steinmeyer Gunter
Published: September 2020

The coherent artifact hinders accurate inversion of pulse measurements. Here we demonstrate a FROG algorithm to accurately retrieve not only the average pulse shape but also the artifact itself, providing access to the underlying coherence properties.
Experimental Demonstration of Simplified Single-shot Supercontinuum Spectral Interferometry
Authors: Patel Dhruvit , Jang Dogeun , Hancock Scott W. , Milchberg Howard M , Kim Ki-Yong
Published: September 2020

We use a genetic algorithm (GA) to retrieve a pump-induced phase modulation on a probe pulse in Single-Shot Supercontinuum Spectral Interferometry (SSSI) without pre-characterizing the probe pulse to determine its spectral phase.
Compact low loss MEMS phase shifters for scalable field-programmable silicon photonics
Authors: Edinger Pierre , Errando-Herranz Carlos , Takabayashi Alain Yuji , Sattari Hamed , Quack Niels , Verheyen Peter , Bogaerts Wim , Gylfason Kristinn B.
Published: September 2020

MEMS offer low power tunability to silicon photonics. However, reported phase shifters lack in range, IL, or linearity. We show n linear phase shift in compact, 0.2 dB-IL MEMS devices, and demonstrate trade-offs for scalability.
Tunable Matched-Pair High-Order Vernier Multi-Ring Filters with >100 nm FSR
Authors: Mak Jason C.C. , Poon Joyce K S.
Published: September 2020

We propose and demonstrate a novel Vernier microring filter achieving an ultra-high out- of-band extinction of -52 dB and large free spectral range > 100 nm. The filter is wavelength-tunable over the O-band.
A shot-noise-limited ultrabroadband sampling oscilloscope
Authors: Kowligy Abijith S. , Lind Alexander , Lesko Daniel , Xing Sida , Diddams Scott
Published: September 2020

We demonstrate a shot-noise-limited electric-field sampling oscilloscope with >75 THz bandwidth in the mid-infrared. We evaluate fundamental noise sources in the electric-field measurements, including timing jitter induced phase-to-amplitude noise at the 100 attosecond level.
Inverse design of microresonator dispersion for nonlinear optics
Authors: Ahn Geun Ho , Yang Ki Youl , Skarda Jinhie , Vučković Jelena
Published: September 2020

Inverse design optimizes microcavity structures for desired dispersion properties and fabrication constraints. We experimentally demonstrate robust control of cavity dispersion at the telecommunication band on foundry compatible photonic platform.
Mid-infrared emission and absorption from GeSn/Ge coreshell nanowires with nanophotonic light extraction
Authors: Peng Siying , Braun Michael , Meng Andrew , Shang Zhengrong , Salleo Alberto , McIntyre Paul C.
Published: September 2020

We demonstrate room temperature mid-infrared photodetection using resonantly absorbing GeSn/Ge core/shell nanowire photonic crystals. For emission, we designed and characterized mid-infrared emission of resonantly scattering GeSn/Ge coreshell nanowires with 912% Sn.
Integrated WDM-based Optical Comparator for High-speed Computing
Authors: Feng Chenghao , Ying Zhoufeng , Zhao Zheng , Gu Jiaqi , Pan David Z. , Chen Ray T.
Published: September 2020

We propose and experimentally demonstrate a 2-bit wavelength-division-multiplexing (WDM) based optical comparator using microdisk modulators operating at 10 Gb/s. The proposed comparator has advantages of higher speed and lower power consumption compared to electronic counterparts.
Nanophotonic tantalum pentoxide devices for integrated quantum technology
Authors: Wolff Martin A. , Splitthoff Lukas , Grottke Thomas , Vogel Simon , Schuck Carsten
Published: September 2020

We present a novel platform for integrated quantum photonics based on tantalum pentoxide thin films. We show passive and active functionality with 356,000 Q-factor ring resonators, nanoelectromechanical phase shifters and 84% efficiency waveguide-integrated singlephoton detectors.
Tapered atomic cladded nano waveguide for improved frequency stabilization
Authors: Zektzer Roy , Mazurski Noa , Barash Yefim , levy Uriel
Published: September 2020

We integrate atoms and nano-waveguides on a chip to demonstrate a chip-scale frequency reference. Novel design and fabrication allows to face challenges related to linewidth, light-shift and frequency instability.
High-Speed InGaAs/InAlGaAs Waveguide Photodiodes Grown on Silicon by Heteroepitaxy
Authors: Gao Junyi , Sun Keye , Jung Daehwan , Bowers John , Beling Andreas
Published: September 2020

We demonstrate III-V on silicon waveguide photodiodes with 200 nA dark current, 0.27 A/W fiber-coupled responsivity, and over 25 GHz 3-dB bandwidth.
1.5-Gbit/s Filter-free Optical Communication Link based on Wavelength-selective Semipolar ( 20 21 ¯ ) InGaN/GaN Micro-photodetector
Authors: Kang Chun Hong , Liu Guangyu , Lee Changmin , Alkhazragi Omar , Wagstaff Jonathan M. , Li Kuang-Hui , Alhawaj Fatimah , Ng Tien Khee , Speck James S. , Nakamura Shuji , DenBaars Steven P. , Ooi Boon S.
Published: September 2020

We report on wavelength-selective semipolar

(
20

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InGaN/GaN micro-photodetector with broad modulation bandwidth of 293.52 MHz, outperforming polar-based devices. A 1.5-Gbit/s data rate was achieved without the need of spectral-efficient modulation format.
Extracting the Gouy Phase of Radially Polarized Laser Beams in the Presence of Diffraction
Authors: Pelchat-Voyer S. , Piche M.
Published: September 2020

We show using vectorial integrals how the Gouy phase shift of radially polarized laser beams can be severely impacted by diffraction. We describe how to retrieve the Gouy phase even when diffraction is dominant.
Generation of Annular Beam using Photonic Crystal Cavity
Authors: Sharma Naresh , Kumar Govind , Rvijaya  , Gupta Shilpi
Published: September 2020

We demonstrate generation of an annular beam by spatially filtering a circularly-polarized Gaussian beam using a photonic crystal cavity that exhibits in-plane symmetry and narrow bandpassfiltering. Our experimental results match well with simulations.
Telecommunication-Compatible Photoconductive Terahertz Detection without Using a Short-Carrier-Lifetime Substrate
Authors: Lu Ping-Keng , Jarrahi Mona
Published: September 2020

We present a telecommunication-compatible photoconductive detector, which uses plasmonic nanostructures to provide ultrafast carrier transit times for high-performance terahertz detection (>110 dB signal-to-noise-ratio and >3 THz bandwidth), eliminating the need for short- carrier-lifetime substrates for the first time.
Telecommunication-Compatible Bias-Free Photoconductive Source with a 5 THz Radiation Bandwidth
Authors: Turan Deniz , Yardimci Nezih Tolga , Lu Ping-Keng , Jarrahi Mona
Published: September 2020

We demonstrate a telecommunication-compatible bias-free plasmonic photoconductive source that induces a strong built-in electric field to drift the majority of photocarriers to generate terahertz radiation over a bandwidth exceeding 5 THz with a 100-dB dynamic range.
Towards Integrated Attosecond Time-Domain Spectroscopy
Authors: Bionta M. R. , Ritzkowsky F. , Turchetti M. , Yang Y. , Kartner F. X. , Berggren K. K. , Keathley P. D.
Published: September 2020

We report a cross-correlation technique based on perturbation of local electron field emission rates that allows for the full characterization of arbitrary electric fields down to 4 femtojoules using plasmonic nanoantennas.
Characterization of a Diode-Pumped Ti:sapphire Frequency Comb
Authors: Castro-Marin Pablo , Mitchell Toby , Sun Jinghua , Reid Derryck T.
Published: September 2020

We describe and characterize a fully stabilized directly-diode-pumped Ti:sapphire frequency comb, exhibiting cumulative phase noise (1 Hz to 1 MHz) of 860 mrad for fcEo and 54 mrad for ./rep.
Dual comb spectroscopy for characterization of short optical pulses
Authors: Ghosh Sutapa , Eisenstein Gadi
Published: September 2020

A technique to characterize arbitrary optical pulses based on dual comb spectroscopy was developed. Distortions due to timing and phase fluctuations were determined and a method to compensate for them was demonstrated.