bluuebunny/crossref_metadata_2025 huggingface dataset:
High Q Microresonators Based on Epitaxial GaN Film
Authors: Zheng Yanzhen , Sun Changzheng , Xiong Bing , Wang Lai , Wang Jian , Han Yanjun , Hao Zhibiao , Li Hongtao , Yu Jiadong , Luo Yi
Published: September 2020

High-Q GaN microring resonators are fabricated with optimized CH/BCF/Ar inductively coupled plasma (ICP) dry etching process. The GaN microresonator exhibits an intrinsic Q factor exceeding 2* 105, which is the highest Q reported so far.
On-Chip Optical Spectrometer Based on InGaN/GaN Wavelength-Selective Nanostructural Absorbers
Authors: Sarwar Tuba , Cheekati Srinivasa , Chung Kunook , Ku Pei-Cheng
Published: September 2020

We demonstrate an optics-free chip-scale optical spectrometer consisting of monolithically integrated semiconductor photodetectors that have inherent wavelength selectivity by local strain engineering. Computational spectral estimation of unknown incident light is also presented in visible range.
Excitability in Mid-Infrared Quantum Cascade Lasers: from Communication Jamming to Neuromorphic Photonics
Authors: Spitz O. , Wu J. , Carras M. , Maisons G. , Wong C. W. , Grillot F.
Published: September 2020

We experimentally build a basic optical neuron by taking advantage of excitability in a semiconductor laser under optical feedback, rather than conventional injection schemes. This optical neuron operates faster than its biological and electronical counterparts.
Interband Cascade Lasers
Authors: Vurgaftman I. , Canedy C. L. , Kim C. S. , Kim M. , Merritt C. D. , Bewley W. W. , Tomasulo S. , Meyer J. R.
Published: September 2020

Recent advances in midwave infrared interband cascade lasers (ICLs) include novel distributed feedback configurations, vertical-cavity surface-emitting lasers, light-emitting devices, frequency combs, dual-comb spectroscopy, and ICLs incorporated into photonic integrated circuits on silicon and III-V platforms.
Robust Miniature Pure-Phase Modulators at k = 488 nm
Authors: Huang Heqing , Liang Guozhen , Mohanty Aseema , Ji Xingchen , Shin Min Chul , Lipson Michal , Yu Nanfang
Published: September 2020

We demonstrate miniature silicon nitride (SiN) pure-phase modulators operating at the blue wavelength. The devices are based on adiabatic micro-rings that are robust against fabrication variations and hold great promise for large-scale visible integrated systems.
Two-channel data transmission on a polarization- maintaining highly elliptical core fiber without MIMO
Authors: Corsi Alessandro , Chang J. H. , Johnson S. , Zhalehpour S. , Rusch L. A. , LaRochelle S.
Published: September 2020

We transmit two QPSK signals over a polarization maintaining highly-elliptical-core multimode fiber without recourse to MIMO processing. OSNR penalty is between 2.3 and 3.5 dB at 24 Gbaud.
On-Chip Dispersion Spectroscopy of CO2 Using a Mid-Infrared Microring Resonator
Authors: Briano Floria Ottonello , Errando-Herranz Carlos , Gylfason Kristinn B.
Published: September 2020

We demonstrate on-chip molecular fingerprinting by measuring the refractive index dispersion of gas in the mid-IR using a thermally tuned suspended silicon microring resonator. We show CO2 sensing down to 1000 ppm at 4.23 µm wavelength.
Monolithic piezoelectric control of integrated soliton microcombs
Authors: Liu Junqiu , Tian Hao , Lucas Erwan , Raja Arslan S. , Lihachev Grigory , Wang Rui Ning , He Jijun , Liu Tianyi , Anderson Miles H. , Weng Wenle , Bhave Sunil A. , Kippenberg Tobias J.
Published: September 2020

We demonstrate piezoelectric actuators monolithically integrated on ultralow-loss Si3N4 waveguides. Varying the voltage applied on the actuator allows tuning the microres-onator, and is used to initiate, switch, stabilize and tightly phase lock the single soliton microcomb.
High-power 1700 nm femtosecond laser based on optical parametric chirped-pulse amplification
Authors: Qin Yukun , Batjargal Orkhongua , Cromey Benjamin , Kieu Khanh
Published: September 2020

We present a high-power, all-fiber optical parametric chirped-pulse amplifier working at 1700 nm. The laser delivers 1.42 W average power and ~40 nJ pulse energy. The pulses can be de-chirped to ~450 fs.
Thermodynamic model for photothermal effects in optomechanics
Authors: Primo André G. , Benevides Rodrigo , Kersul Cauê M. , de Assis Pierre-Louis , Wiederhecker Gustavo S. , Alegre Thiago P. M.
Published: September 2020

We derive and validate a model for the photothermal forces that act on optomechanical cavities. Our results not only enable the prediction of such effect but also show that it is much stronger than previously estimated.
2 μm Actively Mode-locked External-cavity Semiconductor Laser
Authors: Jiang Weiqi , Qin Jiarong , Shi Yi , Zhu Shining , Wang Fengqiu
Published: September 2020

We have for the first time demonstrated a 450 MHz actively mode-locked externalcavity semiconductor laser at 2 pm. The system can be tuned from 1870-1980 nm, which makes the laser a wavelength-agile pulsed source.
Pulse Burst Mode Dual-Comb Spectroscopy for Time-Resolved Measurements of Laser-Induced Plasmas
Authors: Zhang Yu , Weeks Reagan R. D. , Lecaplain Caroline , Yeak Jeremy , Harilal Sivanandan S. , Phillips Mark C. , Jones R. Jason
Published: September 2020

We introduce a pulse burst mode form of dual-comb spectroscopy to enable time-resolved measurements of singular events. The time-resolved spectrum of iron following a single ablation shot of stainless steel is demonstrated.
Laser-induced Cavitation Using Amplified Dynamic High Order Bessel-gauss Beams Integrated in Time (HOBBIT)
Authors: Miller J. Keith , Li Yuan , Johnson Eric G.
Published: September 2020

Optimization of laser-induced cavitation using amplified dynamic HOBBIT beams is demonstrated. The ring-profiled beams consist of coherent superpositions of asymmetric Bessel- Gauss beams containing orbital angular momentum with dynamic spatial and temporal control at λ=2.09 μm.
Fractional Optical Vortex Induced Mass Forward Transfer -Deflected ‘Spin-Jet'-
Authors: Kawaguchi Haruki , Nakamura Ryosuke , Umesato Kei , Miyamoto Katsuhiko , Omatsu Takashige
Published: September 2020

We demonstrate the creation of a deflected spinning jet, made of high-viscosity donor material, so-called deflected ‘spin-jet', by employing fractional optical vortex induced mass forward transfer technique. The ‘spin-jet' can be deflected at any deflection angle by appropriately control of a topological charge of the fractional vortex without any mechanical systems.
The Impact of Higher Order Dispersion in a Time Lens based WDM Transmitter
Authors: Xu X. , Lillieholm M. , Girouard P. D. , Ekner P. D. , Galili M. , Oxenløwe L. K. , Guan P.
Published: September 2020

We investigate the effect of third order dispersion on the WDM signal generated by optical Fourier transformation. Compared to FBGs, SMF is experimentally shown to result in a channel frequency drift exceeding the channel spacing.
Three-dimensional Imaging with a Single Layer of Random Microlens Array
Authors: Tian Feng , Hu Junjie , Yang Weijian
Published: September 2020

We propose a compact, three-dimensional and large-field-of-view imaging system using a single layer of random microlens array. Comparing to other mask-based imaging systems, our approach has a higher image reconstruction speed and increased signal-to-background ratio.
Interfacial Lasing Microsensors Driven by Cavity Resonant Energy Transfer
Authors: Yuan Zhiyi , Wang Ziyihui , Guan Peng , Chen Yu-Cheng
Published: September 2020

We have proposed a novel concept to achieve active lasing-encoded biosensors by taking advantage of light-harvesting effect at the cavity interface, where interfacial molecular lasers based on cavity resonant energy transfer was demonstrated.
Hybrid Integration of High-Q Chalcogenide Microring Resonators on Silicon-on-insulator
Authors: Jean Philippe , Douaud Alexandre , LaRochelle Sophie , Messaddeq Younes , Shi Wei
Published: September 2020

We demonstrate novel on-chip chalcogenide microresonators directly inte grated on the silicon-on-insulator platform using an etchless fabrication method and thermal dewetting. A high Q greater than 4.6 × 10
5
is measured at telecommunication wavelengths.
A gain-enhanced silicon-photonic optical phased array with integrated O-band amplifiers for 40-m ranging and 3D scan
Authors: Byun Hyunil , Lee Jisan , Jang Bongyong , Lee Changbum , Lee Eunkyung , Hwang Inoh , Shin Changgyun , Shin Dongjae , Shim Dongshik , Otsuka Tatsuhiro , Hwang Sungwoo , Choo Hyuck , Ha Kyoungho
Published: September 2020

For the first time, we demonstrate 40-m range detection and 3D depth scan up to 20 m using a silicon-photonic optical phased array with integrated amplifiers, promising a highperformance solid-state light-detection and ranging (LiDAR) system.
Dual-comb characterization of bound soliton states in a single-cavity dual-comb laser
Authors: Sterczewski Lukasz A. , Przewloka Aleksandra , Kaszub Wawrzyniec , Sotor Jaroslaw
Published: September 2020

We present a cross-correlation characterization of bound soliton states emerging in a polarization-multiplexed single-cavity dual-comb laser. High temporal and spectral resolution measurements over long optical delays are obtained through multi-heterodyne beating of the laser output.
VO2 electro-optic memory and oscillator for neuromorphic computing
Authors: Jeong Junho , Jung Youngho , Qu Zhongnan , Cui Bin , Khanda Ankita , Sharma Ankita , Parkin Stuart S. P. , Poon Joyce K. S.
Published: September 2020

We demonstrate optical memory and light-triggered electrical oscillations in a VO2 electro optic micro-wire device for potential applications in neuromorphic computing architectures.
Fe:ZnSe hot-pressed ceramic laser
Authors: Karki Krishna , Yu Shengquan , Fedorov Vladimir , Wu Yiquan , Mirov Sergey
Published: September 2020

We report optical characterization of Fe:ZnSe hot-pressed ceramics and demonstrate first room-temperature gain-switched lasing of this new ceramic medium. The maximum output energy was measured to be 0.7 mJ at 3.5% slope efficiency.
Functional Surfaces of Laser-microstructured Silicon Coated with Polymer Blends Switching Between Hydrophilicity and Hydrophobicity
Authors: Kanidi M. , Papagiannopoulos A. , Matei A. , Dinescu M. , Pispas S. , Kandyla M.
Published: September 2020

We develop functional surfaces of laser-microstructured silicon, spin-coated with thermoresponsive PS/PNIPAM polymer blends and we study their switching wetting behavior between hydrophilicity and hydrophobicity upon heating. The transition is reversible for multiple heating/cooling cycles.
Thermal assisted carrier recombination in CsPbBr3 nanocrystals
Authors: Poonia Ajay K. , Mir Wasim J. , Shrivastava Megha , Nag Angshuman , Adarsh K. V.
Published: September 2020

We have studied band edge carrier dynamics in CsPbBr3 nanocrystals using ultrafast non-degenerate transient absorption spectroscopy and report three times slower carrier recombination at low temperatures compared to ambient conditions.
Broadband, Waveguide-integrated Mid-Infrared Black Phosphorus Modulator with High Modulation Depth
Authors: Lee Seokhyeong , Peng Ruoming , Li Mo
Published: September 2020

The electro-optical modulation of black phosphorus is promising in broad mid-IR range. We demonstrated 10% of modulation at 3-µm wavelength by a multi-passing waveguide device and proposed a plasmonic waveguide to achieve higher modulation depth and smaller footprint.
Integration of Diffractive Optical Neural Networks with Electronic Neural Networks
Authors: Mengu Deniz , Luo Yi , Rivenson Yair , Ozcan Aydogan
Published: September 2020

We demonstrate jointly-trained hybrid (optical-electronic) networks, where diffractive optical neural networks act as a trainable front-end mitigating the information loss at a low-resolution image sensor to improve the overall classification accuracy of the hybrid network.
Low-power thermo-optic silicon modulator geometrically optimized for photonic integrated circuits
Authors: Nakai Makoto , Chung SungWon , Hashemi Hossein
Published: September 2020

We demonstrate geometrically-optimized thermo-optic phase modulator structures to achieve low power consumption, low loss, and compact formfactor. One such optimized design consumes 1.67 mW for π phase modulation with 0.98 dB optical loss in 0.0057 mm2 footprint.
Single-cell Fourier-transform light scattering analysis by high- throughput label-free imaging flow cytometry
Authors: Zhang Ziqi , Lai Queenie T.K , Lee Kelvin C.M. , Wong Kenneth K Y. , Tsia Kevin K
Published: September 2020

We report a high-throughput imaging flow cytometer that employs Fourier-transform light-scattering analysis to parametrize high-resolution single-cell morphology, notably subcellular mass-density fractal pattern, as sensitive label-free phenotypes to identify different cell types and states.
High-Efficiency Parametric Amplification of Broadband Spectrally Incoherent Pulses
Authors: Dorrer C. , Hill E. M. , Zuegel J. D.
Published: September 2020

We investigate the high-efficiency parametric amplification of broadband incoherent waves, in particular in a spatially collinear spectrally quasi-degenerate configuration increasing the output energy and bandwidth, for enhanced laser-target interaction.
Highly-sensitive multi-axes rotation sensing using large momentum transfer point source atom interferometry
Authors: Li Jinyang , Huang Wayne C. , Fouda Mohamed , Kovachy Timothy , Shahriar Selim M.
Published: September 2020

Employing a fully quantized model for atomic wave-packets, we show that a large momentum transfer, multi-axes gyroscope using point-source atomic interferometry (PSAI) can achieve a sensitivity much higher than that of a conventional PSAI gyroscope.
High power thin-disk oscillator driven single-cycle THz source with 66 mW of average power
Authors: Meyer F. , Vogel T. , Ahmed S. , Saraceno C. J.
Published: September 2020

We demonstrate a THz source based on optical rectification of a high-power thin-disk laser using the tilted pulse front technique in Lithium Niobate, reaching a record-high average power of 66mW at 13.3MHz repetition rate.
Octave-spanning frequency comb generation in all-normal-dispersion silicon-rich silicon nitride waveguide
Authors: Christensen Simon , Ye Zhichao , Bache Morten , Company Victor Torres
Published: September 2020

A frequency comb spanning from 1100 nm to 2200 nm is generated in an all-normal-dispersion silicon-rich silicon nitride waveguide. Phase noise measurements indicate that the supercontinuum generation retains the coherence.
Four-wave mixing conversion efficiency requirements for optical phase conjugation based fiber nonlinearity compensation
Authors: Yankov Metodi P. , Kaminski Pawel M. , Ros Francesco Da
Published: September 2020

It is demonstrated that 90% of the nonlinearity compensation gains of mid-link OPC can be achieved by a fraction of the maximum conversion efficiency provided by the nonlinear medium used for the four-wave mixing.
Robust Hybrid III-V/Si3N4 Laser with kHz-Linewidth and GHz-Pulling Range
Authors: Gil-Molina Andres , Westreich Ohad , Antman Yair , Ji Xingchen , Gaeta Alexander L. , Lipson Michal
Published: September 2020

We demonstrate a hybrid III-V/S13N4 laser system robust to coupling losses and reflection variations. We show self-injection locking of a conventional laser diode to a high-Q resonator obtaining 1 kHz linewidth and 2 GHz pulling range.
Modulation of QCSE in InGaN-based LEDs with truncated- hexagonal-pyramid patterned-sapphire substrates
Authors: Chien Cheng-Yen , Chen Meng-Hsin , Pai Chia-Wei , Lee Yu-Jen , Huang Chiu-Chang , Su Vin-Cent , Kuan Chieh-Hsiung
Published: September 2020

A method for the modulation of QCSE inside multiple-quantum wells of InGaN-based LEDs is proposed and confirmed with photoluminescence, Raman spectra, and electroluminescence using an integrating sphere.
Optical-controlled Fast Switching of Radio Frequency Orbital Angular Momentum Beams with Different Modes and Steering Directions
Authors: Song Xiyao , Ma Jingcan , Bai Yunping , Zheng Zhennan , Gao Xinlu , Huang Shanguo
Published: September 2020

A system of optical-controlled fast switching of RF-OAM beams with different modes and steering directions is proposed. Two RF-OAM beams with l = 1, θ = −3° and l = −1, 0=3° are generated and switched 5 times in 100ms.
Photonic chip-based resonant supercontinuum generation with intrinsic nonlinear filtering
Authors: Anderson Miles , Bouchand Romain , Liu Junqiu , Weng Wenle , Obrzud Ewelina , Herr Tobias , Kippenberg Tobias J.
Published: September 2020

We demonstrate broadband soliton-based resonant supercontinuum generation in a chip-based microresonator. We show that the soliton possesses an intrinsic ability to filter RF noise transfer from the input pulses, which can be further improved with asynchronous driving.
Nanobenders: efficient piezoelectric actuators for widely tunable nanophotonics at CMOS-level voltages
Authors: Jiang Wentao , Mayor Felix M. , Patel Rishi N. , McKenna Timothy P. , Sarabalis Christopher J. , Safavi-Naeini Amir H.
Published: September 2020

We introduce a compact (~ 10 pm2) piezoelectric actuator, and use it to tune the optical resonance wavelength of a lithium niobate photonic crystal cavity by ~ 5 nm/V. The tuning range is 1520-1560 nm with 4 V.
Incoherent Dual Laser Carriers Enable 60-GHz Millimeter-Wave-Over-Fiber Link
Authors: Tsai Cheng-Ting , Li Chien-Cheng , Chen Chao-Wei , Lin Chun-Ting , Cheng Chih-Hsien , Chi Sien , Lin Gong-Ru
Published: September 2020

Remote heterodyne of incoherent dual laser carriers enables local-oscillator-free 60- GHz MMWoF link for delivering 10-Gbit/s 16-QAM OFDM data over 25-km single-mode-fiber and 3-m free-space with 1.7-dB signal-to-noise ratio enhancement via Volterra series nonlinear noise compensation.
High Power VCSEL Amplifier for 3D Sensing
Authors: Koyama Fumio
Published: September 2020

The device concept and experiments for high power VCSEL amplifiers will be presented for 3D sensing. We demonstrate a VCSEL amplifier, which offers watt-class high power operations and high-resolution nonmechanical beam steering functions.
Observation of stimulated Brillouin scattering in silicon nitride integrated waveguides
Authors: Yang Fan , Gyger Flavien , Liu Junqiu , He Jijun , Raja Arslan S. , Wang Rui Ning , Bhave Sunil A. , Kippenberg Tobias J. , Thevenaz Luc
Published: September 2020

We report the first observation of backward stimulated Brillouin scattering in fully cladded Si3N4 waveguides. The intrinsic Brillouin gain at 25 GHz and the photoelastic constant are estimated to be 4 × 10−13 m/W and |p12| = 0.047 ± 0.004 respectively.
Integrated Graphene Electro-Optic Modulator on Si3N4 with Increasing Bandwidth at Cryogenic Temperatures
Authors: Lee Brian S. , Zhu Yibo , Freitas Alexandre P. , Bhatt Gaurang R. , Hone James , Lipson Michal
Published: September 2020

We demonstrate an integrated graphene modulator overcoming the limits of 3D photonic materials at cryogenic temperatures, with a 17% bandwidth improvement from 11.9 GHz at 293 K to 13.9 GHz at 4.9 K.
High Quality Factor Aluminum Nitride on Sapphire Resonators at Infrared and Near Infrared Wavelengths
Authors: Sun Yi , Shin Walter , Wang Ping , Laleyan David Arto , Pandey Ayush , Liu Xianhe , Wu Yuanpeng , Soltani Mohammad , Mi Zetian
Published: September 2020

We demonstrate low-loss aluminum nitride waveguides and ring resonators on sapphire. The ring resonators on this platform shows a high quality factor above 2.8 million at 1550 nm and above 120,000 at 780 nm.
All-Fiber Tunable Ultra-Broadband Mode Converter Based on Helical Long-Period Grating
Authors: Zhao Xinyi , Liu Yunqi , Liu Zuyao , Mou Chengbo
Published: September 2020

We propose a tunable ultra-broadband mode converter based on helical long-period gratings inscribed in a two-mode fiber by CÜ2-laser. The 1st order orbital angular momentum mode was generated directly over 10-dB bandwidth of 296.7 nm.
Factor 40 pulse post-compression of 200 W in-burst average power pulses via single-stage multi-pass spectral broadening
Authors: Balla Prannay , Wahid Ammar Bin , Sytcevich Ivan , Guo Chen , Schönberg Arthur , Viotti Anne-Lise , Silletti Laura , Cartella Andrea , Alisauskas Skirmantas , Tavakol Hamed , Grosse-Wortmann Uwe , Seidel Marcus , Manschwetus Bastian , Lang Tino , Calegari Francesca , Couairon Arnaud , L’HuiUier Anne , Arnold Cord L. , Hartl Ingmar , Heyl Christoph M.
Published: September 2020

We report nonlinear pulse compression of 1.2-ps, 2-mJ pulses. For spectral broadening, we use a Kr-filled Herriott-type cell with 22-roundtrips. After a chirped-mirror compressor, we measure 30-fs pulses, 80% transmission and an M2 of 1.5×1.7.
Spectral Interferometric Microscopy for Fast and Broadband Phase Characterization
Authors: Michaeli Lior , Ben Haim Danielle , Suchowski Haim , Ellenbogen Tal
Published: September 2020

We introduce a novel interferometric method for fast, broadband and microscopic phase characterization, based on common-path configuration. The method can be implemented by adding a simple optical relay to connect conventional microscope and imaging spectrometer.
Abnormal Anisotropic Nonlinear Absorption in Bulk ReS2 Measured by Intensity-scan Method
Authors: Zhou Yongjian , Meng Xianghai , Wang Yaguo
Published: September 2020

Polarization dependent nonlinear absorption in bulk ReS2 is measured by Intensity-scan. Absorption under high peak power shows a transition from saturable absorption to reverse saturable absorption when rotating the polarization with respect to the b-axis.
Interleaved difference-frequency-generation for mid-infrared microcomb spectral densification
Authors: Bao Chengying , Yuan Zhiquan , Wang Heming , Wu Lue , Shen Boqiang , Sung Keeyoon , Leifer Stephanie , Lin Qiang , Vahala Kerry
Published: September 2020

Generation of mid-infrared combs (3.3 micron band) with GigaHertz line spacing is demonstrated by interleaved difference-frequency-generation. The method, applied to a 22 GHz repetition-rate microcomb, is useful for spectral densification of sparse microcomb spectra.
Dynamics of Soliton Microcomb Self-Injection Locking in a Silicon Nitride Microresonator
Authors: Voloshin Andrey S. , Liu Junqiu , Kondratiev Nikita M. , Lihachev Grigory V. , Kippenberg Tobias J. , Bilenko Igor A.
Published: September 2020

We demonstrate a chip-scale 30 GHz single soliton microcomb based on DFB laser locked to a Si
3
N
4
microresonator. We propose novel theoretical and experimental approaches to explain dynamics of self-injection locking, modified by Kerr nonlinearity.
On-chip Q-factor greater than 1 billion
Authors: Wu Lue , Wang Heming , Yang Qi-Fan , Gao Maodong , Ji Qing-Xin , Shen Boqiang , Bao Chengying , Vahala Kerry
Published: September 2020

A record Q-factor of 1.1 billion is demonstrated in on-chip silica whispering-gallery resonators. Using the devices, sub-milliwatt parametric oscillation threshold is measured in 9 GHz free-spectral-range devices.
Towards Cognitive Management and Performance Monitoring in Coherent Optical Networks
Authors: Tremblay Christine
Published: September 2020

In this tutorial, we review cognitive management and performance monitoring methods based on machine learning for addressing important challenges such as quality of transmission estimation, performance prediction and failure detection in coherent optical networks.
All-polarization-maintaining dual-wavelength mode-locked fiber laser based on macro-bending loss tuning
Authors: Zhu Yuanjun , Cui Zekun , Sun Xiangnan , Jiang Hongbo , Zhao Hengwei , Jin Lei , Set Shinji Yamashita Sze Yun
Published: September 2020

We demonstrate an all-polarization-maintaining dual-wavelength mode-locked fiber laser by bending a section of polarization maintaining fiber for intra-cavity loss tuning for the first time. This technique provides a simple way to generate dual-wavelength pulses with different repetition rate, which is potential for dual-comb spectroscopy.
Control of pulse regime generation with electrochemically gated carbon nanotube saturable absorber
Authors: Gladush Yuriy , Mkrtchyan Aram , Kopylova Daria , Ivanenko Aleksey , Nyushkov Boris , Kobtsev Sergey , Kokhanovskiy Alexey , Khegai Alexander , Melkumov Mikhail , Burdanova Maria , Staniforth Michael , Lloyd-Hughes James , Nasibulin Albert G.
Published: September 2020

In present paper we demonstrate a carbon nanotube saturable absorber with variable nonlinear optical response controlled by electrochemical gating. Implemented into all-PM fiber laser scheme this device allows switching between mode-locked and Q-switched generation regimes.
Integrated-Flow Active Cooling for the Thermal Management of Reflective Optics Under High-Average-Power Load
Authors: Power E. P. , Bromage J. , Zuegel J. D.
Published: September 2020

We developed multi-physics numerical models for high-power reflective optics with integrated active cooling of low-expansion ceramic substrates. They predict a 400x improvement in average-power handling versus passive cooling.
Coherence length measurements under strong scintillation conditions using a five-layer laboratory-scaled atmospheric simulator†
Authors: de Pinho e Braga Alexandre , Oesch Denis W. , Dayton David C. , Spencer Mark F.
Published: September 2020

Measurements of structure functions and coherence lengths using two separate sensors in an atmospheric turbulence simulator shows realistic Kolmogorov statistics. The system provides accurate optical benchtop simulations of beam propagation under strong scintillation conditions.
Tunable Terahertz Light Emission from Current-Driven Graphene Plasmonic Oscillators
Authors: Li Yuyu , Ferreyra Pablo , Swan Anna K. , Paiella Roberto
Published: September 2020

Pronounced terahertz emission peaks originating from current-driven plasmonic oscillations in graphene nanoribbons are measured. The emission frequency can be tuned by design through the ribbon width and actively by varying the applied gate voltage.
Time-resolved Single-shot Ablation Dynamics of Silicate Glasses with Few-Cycle Laser Pulses
Authors: Talisa Noah , Harris Brandon , AlShafey Abdallah , Krebs Jacob , Locker Sean , Sundaram S.K. , Chowdhury Enam
Published: September 2020

Few-cycle pulse laser damage and ablation of silicate glasses are studied using time- resolved surface microscopy. Unlike in metals, semiconductors, and various dielectrics, interference fringes due to an ablating layer are not observed for these glasses.
Gas Concentration Measurements Based on Ultrabroadband Coherent Anti-Stokes Raman Scattering Using the Non-resonant Signal
Authors: Ran Yang , Nolte Stefan , Tünnermann Andreas , Ackermann Roland
Published: September 2020

We propose a method using the non-resonant signal measured in pure argon for gas concentration measurements based on ultrabroadband fs/ps coherent anti-Stokes Raman scattering. Measurement accuracies are greatly improved to 5% for CO2/N2/CH4 gas mixtures.
Frequency Division Using a Soliton-Injected Semiconductor Gain-Switched Frequency Comb
Authors: Weng Wenle , Kaszubowska-Anandarajah Aleksandra , Liu Junqiu , Anandarajah Prince M. , Kippenberg Tobias J.
Published: September 2020

By injecting a soliton microcomb into a semiconductor laser that is driven by a sinusoidal current at the subharmonic frequencies of the soliton rate, we demonstrate broadband gain-switched frequency comb generation and low-noise microwave synthesis.
Stable Dissipative Kerr Solitons in a AlGaAs Microresonator Through Cryogenic Operation
Authors: Moille Gregory , Chang Lin , Xie Weiqiang , Lu Xiyuan , Davanco Marcelo , Bowers John E. , Srinivasan Kartik
Published: September 2020

We demonstrate stable microresonator Kerr solitons in an Alo^Gao.gAs-on-insulator resonator thanks to cryogenic quenching of the thermorefractive effect. Reaching such a phase-stable state is a prerequisite to fully exploit the potential of this platform.
Soliton Comb Generation in Air-Clad AlN Microresonators
Authors: Zheng Yanzhen , Sun Changzheng , Xiong Bing , Wang Lai , Wang Jian , Han Yanjun , Hao Zhibiao , Li Hongtao , Yu Jiadong , Luo Yi , Yan Jianchang , Wei Tongbo , Zhang Yun , Wang Junxi
Published: September 2020

Air-clad microring resonators with intrinsic quality factor exceeding 2×106 are fabricated based on AlN-on-sapphire platform, and dissipative Kerr solitons (DKSs) are stably generated with the help of auxiliary pump.
An Indoor Visible Light Communication and Positioning System Based on Machine Learning and Alamouti STBC
Authors: Ni Shencheng , Wang Feng , Han Shuying , Li Xiang , Liu Wu , Li Cai , You Shanhong
Published: September 2020

We proposed and experimentally demonstrated a simultaneous indoor visible light communication and positioning system based on machine learning and Alamouti STBC with two LED lamps. The average positioning error is as low as 0.73 cm.
First Demonstration of Multi-user QAM-OFDMA Visible Light Communication System Based on a 75-μm Single Layer Quantum Dot Blue Micro-LED
Authors: Zhang Li , Wei Zixian , Chen Chien-Ju , Wang Lei , Chen Kai-Chia , Wu Meng-Chyi , Dong Yuhan , Wang Lai , Luo Yi , Fu H. Y.
Published: September 2020

We demonstrate a 3-meter 2.5-Gbaud QAM-OFDMA visible light communication (VLC) system affording two users by implementing a 75^m single layer quantum dot (QD) blue micro-LED with achieved extremely high packaging modulation bandwidth at 1.03 GHz.
Generation of 64 fs, 10 kW peak-power, transform-limited pulses directly from an Yb-doped Figure-9 fiber laser
Authors: Edelmann Marvin , Hua Yi , Koch Andrea , Kärtner Franz X.
Published: September 2020

We numerically and experimentally generate transform-limited, 64 fs pulses with 10 kW peak-power directly from the output of a modified Yb-doped Figure-9 fiber laser by overdriving the transmittance of the NALM.
Optical networking within the Lightwave Energy-Efficient Datacenter project [Invited]
Authors: Mellette William M. , Forencich Alex , Kelley Jason , Ford Joseph , Porter George , Snoeren Alex C. , Papen George
Published: September 2020

The Lightwave Energy-Efficient Datacenter (LEED) project within the ARPA-e ENLITENED program is developing novel energy-efficient multichannel lightwave networks. These networks are enabled by a new optical “rotor” switch that can reconfigure the network topology in less than 20 µs and a field-programmable-gate-array-based network interface controller called Corundum that can provide precise network-wide synchronization of packets admitted into the lightwave network. Here we review the optical networking research within LEED and discuss future directions.
Quantum-enhanced balanced detection for ultrasensitive transmission measurement
Authors: Ozeki Yasuyuki , Miyawaki Yu , Taguchi Yoshitaka
Published: September 2020

Balanced detection is a popular method to cancel out the effect of
laser intensity noise in optical measurements and spectroscopy.
However, the signal-to-noise ratio (SNR) that can be achieved with
balanced detection is constrained by the standard quantum limit (SQL).
Here, we propose quantum-enhanced balanced detection (QBD), which
allows us to improve the SNR beyond the SQL to realize ultrasensitive
transmission measurement. In QBD, squeezed vacuum is injected to one
of the input ports of a beamsplitter (BS) used in balanced detection
to produce a pair of light waves whose shot noises are entangled with
each other. Compared with previous quantum-enhanced measurement
methods, QBD is advantageous because it can handle a higher optical
power without sacrificing the degree of sensitivity enhancement. We
present the theory of QBD and discuss the effects of the splitting
ratio of the BS and the optical loss caused by the sample under test.
We also describe the application of QBD to the sensitivity enhancement
of molecular vibrational imaging based on stimulated Raman scattering
microscopy.
Continuous wave Fe2+:ZnSe mid-IR optical fiber lasers
Authors: Coco Michael G. , Aro Stephen C. , McDaniel Sean A. , Hendrickson Alexander , Krug James P. , Sazio Pier J. , Cook Gary , Gopalan Venkatraman , Badding John V.
Published: September 2020

Today fiber lasers in the visible to near-infrared region of the spectrum are well known, however mid-infrared fiber lasers have only recently approached the same commercial availability and power output. There has been a push to fabricate optical fiber lasers out of crystalline materials which have superior mid-IR performance and the ability to directly generate mid-IR light. However, these materials cannot currently be fabricated into an optical fiber via traditional means. We have used high pressure chemical vapor deposition (HPCVD) to deposit Fe2+:ZnSe into a silica optical fiber template. These deposited structures have been found to exhibit laser threshold behavior and emit CW mid-IR laser light with a central wavelength of 4.12 µm. This is the first reported solid state fiber laser with direct laser emission generated beyond 4 µm and represents a new frontier of possibility in mid-IR laser development.
Ultrafast thin-disk multipass amplifier with 720 mJ operating at kilohertz repetition rate for applications in atmospheric research
Authors: Herkommer Clemens , Krötz Peter , Jung Robert , Klingebiel Sandro , Wandt Christoph , Bessing Robert , Walch Pierre , Produit Thomas , Michel Knut , Bauer Dominik , Kienberger Reinhard , Metzger Thomas
Published: September 2020

We present an ultrafast thin-disk based multipass amplifier operating at a wavelength of 1030 nm, designed for atmospheric research in the framework of the Laser Lightning Rod project. The CPA system delivers a pulse energy of 720 mJ and a pulse duration of 920 fs at a repetition rate of 1 kHz. The 240 mJ seed pulses generated by a regenerative amplifier are amplified to the final energy in a multipass amplifier via four industrial thin-disk laser heads. The beam quality factor remains ∼ 2.1 at the output. First results on horizontal long-range filament generation are presented.
Large Rabi splitting of mixed plasmon–exciton states in small plasmonic moiré cavities
Authors: Ates Simge , Karademir Ertugrul , Balci Sinan , Kocabas Coskun , Aydinli Atilla
Published: September 2020

We report on exciton–plasmon coupling in metallic moiré cavities, both numerically and experimentally. Moiré cavities fabricated using double exposure laser interference lithography were filled with a molecular dye, J-aggregate. Polarization-dependent spectroscopic reflection measurements supported by simulations reveal strong coupling of organic dye excitons with cavity modes of the plasmonic moiré cavities. An anti-crossing at zero detuning, a clear indication of strong coupling, has been observed when the excitonic absorption band resonates with the cavity mode. Large Rabi splitting energies owing to the strong coupling of plasmons and excitons are clearly observed.
Nonlinearity and ionization in Xe: experiment-based calibration of a numerical model
Authors: Tolliver J. , Zahedpour S. , Wahlstrand J. K. , Milchberg H. M. , Kolesik M.
Published: September 2020

Recently proposed universality of the nonlinear response is put to the test and used to improve a previously designed model for xenon. Utilizing accurate measurements resolving the nonlinear polarization and ionization in time and space, we calibrate the scaling parameters of the model and demonstrate agreement with several experiments spanning the intensity range relevant for applications in nonlinear optics at near-infrared and mid-infrared wavelengths. Applications to other species including small molecules are discussed, suggesting a self-consistent way to calibrate light–matter interaction models.
Polymer composites based on polyvinyl chloride nanofibers and polypropylene films for terahertz photonics
Authors: Zhang Tianmiao , Nazarov Ravshanjon , Pham Le Quoc , Soboleva Viktoria , Demchenko Petr , Uspenskaya Mayya , Olekhnovich Roman , Khodzitsky Mikhail
Published: September 2020

The optical properties of the polymer composites consisting of polyvinyl chloride nanofibers and polypropylene films in the frequency range of 0.2–1.0 THz were studied, and the mechanical properties of polyvinyl chloride nanofibers and the structure porosity were investigated. An iterative mathematical model based on effective medium theory was used to describe the effective refractive index and absorption coefficient of the polymer composites. The permittivity tensors of the composites were calculated using the Rytov method. We found that the refractive indices of the composites increased with the increase of polypropylene contents, while absorption coefficients remained the same. The polarization-dependencies of THz optical properties of the composites were relatively low. The proposed composites have the potential to be used as materials for terahertz optical components.
Radio-frequency sputtering fabrication of chalcogenide-based Er3+-doped vertical optical cavities for near-infrared operation
Authors: Normani Simone , Gutwirth Jan , Bodiou Loïc , Baillieul Marion , Joanny Loïc , Charrier Joel , Nĕmec Petr , Nazabal Virginie
Published: September 2020

Chalcogenide-oxide Bragg reflectors and a 1-D vertical cavity for operation at 1.55 µm were designed and fabricated via radio-frequency sputtering. The Bragg reflectors were made out of repeating layers of Al2O3 and As2Se3, and the cavity was obtained via a Ga5Ge20Sb10S65:Er3+ defect layer. The layers’ properties were assessed via ellipsometry and SEM imaging. Transmission spectroscopy verifies the appearance of a well-defined stop-band centered around 1.5 µm with a very wide bandgap, and extremely low transmission, even with a relatively low layer count. The vertical optical cavity fabrication results in the appearance of a resonance within the band, at a wavelength corresponding to the 4I13/2→4I15/2 transition of erbium. The high transmittance at 808 and 980 nm allows for optical pumping, and thus light amplification and coherent light generation from the cavity. The operation of these devices was investigated, showing coherent light emission at 1.5 µm. The results are encouraging in assessing the viability of this design and these materials for operation in the near-infrared range, providing an important step towards the fabrication of chalcogenide-based optical amplifiers for the near-infrared.
A polymorphism in oocyte pigmentation in natural populations of the glass frog Espadarana prosoblepon (Centrolenidae)
Authors: Salazar-Nicholls María José , Hervas Francisca , Muñoz-Tobar Sofía I. , Carrillo Ana-Belén , Ricaurte Heisel , Ron Santiago R. , Romero-Carvajal Andrés
Published: September 2020

The adaptive role of amphibian oocyte melanic pigmentation and its molecular control are still elusive. Here we present evidence of a polymorphism in egg pigmentation in the emerald glass frog Espadarana prosoblepon. In Ecuadorian natural populations of this species, females can lay dark brown or pale eggs that develop into normal pigmented tadpoles and adults. This trait is a sex-limited phenotype which is inherited like a recessive allele that we called pale eggs like (pel). The pel phenotype is exclusive of oocyte cortical melanic pigmentation, which is reduced in comparison to wild type (wt) dark pigmented oocytes. Consequently, pel early embryos are paler in appearance, with reduced melanic pigmentation distributed to early blastomeres and embryonic ectoderm. However, these embryos form normal melanocyte derived pigmentation. Finally, we discuss the origin of this polymorphism and propose the use of E. prosoblepon as a model to study the adaptive role of egg pigmentation.
A display of Developmental Biology in Ibero America
Authors: Del Pino Eugenia M.
Published: September 2020

This issue of the International Journal of Developmental Biology is dedicated to Ibero America, and includes research articles from Argentina, Brazil, Chile, Colombia, Ecuador, Mexico, Panama, Puerto Rico, and Uruguay. It also describes the history of developmental biology in several Ibero American countries. Moreover, the volume contains interviews with scientists living in the region and abroad. Other articles highlight The Latin American Society for Developmental Biology (LASDB), and the International Courses. The main purpose of this volume is to stimulate interest and reseach in developmental biology in Ibero America.
Cell fusion and fusogens - an interview with Benjamin Podbilewicz
Authors: Chimal-Monroy Jesús , Escalante-Alcalde Diana
Published: September 2020

Cell fusion is a process in which cells unite their membranes and cytoplasm. It is fundamental for sexual reproduction and embryonic development. Among the best-known cell fusion processes during animal development are fertilization, myoblast fusion, osteoclast generation, and vulva formation in Caenorhabditis elegans. Although it is involved in many other functions in unicellular and multicellular organisms, little is known about the mechanisms of cell fusion and the genes that code for the proteins participating in this process. Benjamin Podbilewicz has dedicated many years to understanding the processes and mechanisms of cell fusion. In this interview, he spoke to us about how he began his studies of this process, his contributions to this exciting field, his scientific ties with Ibero-America and his strategies for a well-balanced scientific/personal life.
Del oppidum indígena a la ciudad romana. Evolución del paisaje de Segisamo (Sasamón, Burgos, España) a través de la fotografía aérea. Datos de la prospección aérea de 2019
Authors: García Sánchez Jesús , Costa-García José M.
Published: September 2020

Desde 2008 hemos desarrollado un amplio programa de investigación en la comarca del Odra-Pisuerga y tierras de Amaya que tiene como objetivo ahondar en los procesos fundamentales que nos permitan conocer el cambio cultural, político, social y económico producido en el paisaje entre la Segunda Edad del Hierro y el final de la época romana. Por su abrumadora riqueza arqueológica, hemos escogido como caso de estudio el área de Sasamón, donde nos encontramos con un oppidum prerromano, algunos indicios de presencia militar romana y una ciudad fundada a inicios del periodo imperial. Habida cuenta del potencial que esta región presentaba para la documentación de estructuras arqueológicas mediante fotografía aérea, llevamos a cabo una campaña de fotografíado y levantamiento fotogramétrico con UAV en primavera de 2019. Esta intervención nos ha permitido, entre otras cosas, incrementar nuestro conocimiento sobre la presencia militar romana en la zona, así como definir con mayor precisión el urbanismo romano de la ciudad de Segisamo.
Gilberto Freyre y el hibridismo de la sociedad ibérica
Authors: Rugai Bastos Elide
Published: September 2020

El artículo aborda cómo la lectura de los autores españoles Ángel Ganivet, Miguel de Unamuno y José Ortega y Gasset fue fundamental para el desarrollo de los temas “regionalismo”, “tradicionalismo” y “formación del pueblo” en la obra de Gilberto Freyre. Argumenta que, además de los temas centrales en su reflexión, el autor pernambucano reivindica el método en el que se basa el abordaje dado por los escritores hispánicos, caracterizando su narrativa. El texto argumenta también que la combinación de esos elementos permite considerar a la Península Ibérica y a Brasil como sociedades caracterizadas por trazos simultáneamente orientales y occidentales. Busca presentar, asimismo, ese perfil híbrido no como una visión dualista, sino componiendo una definición articulada, apuntando una interpretación del conjunto de los autores analizados no marcada por el regionalismo, sino por un carácter totalizador.
Desenmarañar, iluminar y avanzar
Authors: Neris Do Carmo Ruan Carlos , Silva Hilton P.
Published: September 2020

Schwarcz, L. M. (2019). Sobre o autoritarismo brasileiro. São Paulo: Companhia das Letras.La obra Sobre o autoritarismo brasileiro, de Lilia Moritz Schwarcz, reúne una serie de datos, investigaciones e información histórica para apoyar importantes discusiones actuales.  La autora se muestra perspicaz en el acto de desentrañar la realidad al relacionar lo que estamos viviendo con puntos anteriores de nuestra historia nacional y, definiendo como eje central el autoritarismo que refleja en varios puntos discutidos en la obra, reafirma la relevancia del estudio del pasado para la  construcción del sentido crítico, necesario para fomentar la reflexión sobre las realidades vividas por ciertos grupos de la sociedad. Un libro breve y directo, que lleva el lector a pasear la mirada por un contenido que arroja luz sobre el enmarañado pensamiento de nuestros días, engendrado a lo largo de nuestra formación nacional, que dificulta vislumbrar las formas de autoritarismo establecidas en nuestras relaciones económicas, políticas y sociales.
Coresistance to quaternary ammonium compounds in extended-spectrum beta-lactamase-producing Escherichia coli
Authors: Sütterlin Susanne , Heydecke Anna , Tano Eva
Published: September 2020

Background and Aim: Extended-spectrum β-lactamases (ESBL) in Escherichia coli constitutes one of the major threats to modern medicine, and the increasing pollution with quaternary ammonium compounds (QACs) has been suspected to contribute to the spread of ESBL-producing bacteria. The aim of the study was to investigate ESBLA and ESBLM-C-producing E. coli isolates for their coresistance to QACs and their phylogeny isolated from a Swedish University Hospital.

Materials and Methods: Coresistance in E. coli with production of ESBL enzymes of the type blaCTX-M (n=23) was compared to E. coli producing AmpC type ESBL enzymes blaCMY and blaDHA (n=27). All isolates were tested for susceptibility to antibiotics and QACs, and high-quality whole-genome sequences were analyzed for resistance determinants.

Results: The plasmid-borne small multidrug resistance (SMR) efflux pump sugE(p) was solely present in blaCMY-producing E. coli (n=9), within the same genetic environment blaCMY–blc–sugE(p). Other small multidrug efflux pumps were found without association for ESBL-types: emrE (n=5) and the truncated qacEΔ1 (n=18).

Conclusion: Coresistance of ESBL enzymes and SMR efflux pumps in E. coli was common and might indicate that other substances than antibiotics contribute to the spread and emergence of antibiotic resistance.
Identification and differentiation of Campylobacter isolated from chicken meat using real-time polymerase chain reaction and high resolution melting analysis of hipO and glyA genes
Authors: Syarifah Ika Kartika , Latif Hadri , Basri Chaerul , Rahayu Puji
Published: September 2020

Background and Aim: Campylobacter species have been recognized as the most frequently identified bacterial cause of human gastroenteritis. The aims of this study were to identify Campylobacter jejuni and Campylobacter coli species isolated from chicken meat and to analyze the differences in the melting curve patterns of both species.

Materials and Methods: A total of 105 chicken meat samples collected from slaughterhouses and retailers in six provinces in Indonesia were examined for the isolation and identification of Campylobacter spp. A total of 56 positive isolates of Campylobacter spp. were analyzed using the quantitative real-time polymerase chain reaction and high resolution melting method.

Results: The prevalence of Campylobacter spp. in chicken meat was found to be 61.9%. Regarding the identification, 23 isolates (41.07%) were C. jejuni, 22 (39.29%) were C. coli, six (10.71%) were a mix between C. jejuni and C. coli, and five isolates (8.93%) were Campylobacter spp. All the C. jejuni and C. coli isolates produced varied melting curve patterns.

Conclusion: The high prevalence of C. jejuni and C. coli in chicken meat in Indonesia indicates a high risk of the incidence of campylobacteriosis in humans.
Dispositivo Vestível para Monitoramento de Pessoas Idosas
Authors: Mazetto Mendes Caroline , Isabela Quandt Verônica , Aparecida Dias Elisângela , Sant’Anna Mariani Leonardo
Published: September 2020

Due to medical advances, life expectancy is getting longer andlonger. Consequently the elderly population is growing and newchallenges will be faced in the coming decades. In this context, thispaper presents the development of a monitoring system for theelderly. The system includes a wearable device to detect falls, apanic button to be activated if the user feels unwell, and a speakerthat beeps when medication is required. If the wearable deviceidentifies a fall or detects panic button activation, an alert messageis automatically sent to the mobile device of the responsible for theelderly. The expected result of this project is to efficiently monitorthe elderly and to promote the quality of life and safety for elderlyover 60 years.