bluuebunny/crossref_metadata_2025 huggingface dataset:
Optical Response of the Centric Valve in Cyclotella Quillensis Diatoms
Authors: Bernal Santiago , D’Mello Yannick , Petrescu Dan , Andrews Mark , Plant David V.
Published: September 2020

The optical behaviour of frustules in the centric phytoplankton species Cyclotella Quillensis was investigated using SEM, AFM and SNOM techniques. Our results revealed a photonic crystal lattice that was analysed by photonic band structure simulations.
Receiving Electric Fields with a Rydberg Quantum Sensor
Authors: Cox Kevin C. , Meyer David H. , Castillo Zachary A. , Kunz Paul D.
Published: September 2020

We experimentally and theoretically evaluate the performance of a quantum sensor based on Rydberg atoms across the entire radio-frequency spectrum from DC to 1 THz and make fundamental comparisons with other sensor types.
High Efficiency Fiber-Coupled Single-Photon Source Based on Quantum Dot Embedded in a Semiconductor Nanowire
Authors: Maruf Rubayet Al , Bharadwaj Divya , Anderson Paul , Qiu Jiawei , Zeeshan Mohd , Poole Philip , Dalacu Dan , Reimer Michael , Bajcsy Michal
Published: September 2020

We integrate a semiconductor nanowire embedded quantum dot with a single-mode fiber. To maximize photon collection, we optimize the nanowire geometry and align the lens-tipped fiber with the nanowire using lithographically defined structure.
Sustainable QKD transmissions over fiber infrastructures shared with data and real-time transfers
Authors: Vojtech Josef , Vohnout Rudolf , Horváth Tomáš , Bhownick Sarbojeet , Slapak Martin , Munster Petr , Havlis Ondrej , Velc Radek , Kundrat Jan , Skoda Pavel , Altmannova Lada , Hazlinsky Michal , Usenko Vladyslav , Smotlacha Vladimir
Published: September 2020

In this contribution we present reasons for sharing the fibres by both Quantum key distribution and telecommunication traffic, we describe possible sources of noise, discuss availability of photodetectors. Based on these facts we propose suitable wavelength band and verify injection of such Quantum key distribution signal into telecommunication fibre with no impact to transmission system performance.
1108 nm vortex mode generation from a Self-Raman Nd:GdVO4 laser
Authors: Ma Yuanyuan , Lee Andrew J. , Pask Helen M. , Omatsu Takashige
Published: September 2020

We demonstrate a continuous-wave optical vortex source operating at 1108 nm, corresponding to the weaker Raman transition at 382 cm-1 in Nd:GdVO4, by employing an annular beam pumping geometry formed of an axicon lens and an objective lens. Maximum vortex power of ~50 mW was achieved.
Development of self-resonating enhancement cavity operating in single-longitudinal-mode
Authors: Uesugi Yuuki , Aryshev Alexander S. , Fukuda Masafumi , Omori Tsunehiko , Terunuma Nobuhiro , Urakawa Junji , Takahashi Tohru , Koshiba Yuya , Otsuka Seiya , Washio Masakazu , Hosaka Yuji , Sato Shunichi
Published: September 2020

A single-longitudinal-mode operation of a self-resonating enhancement cavity with the finesse of 524 was achieved without any feedback control, demonstrating a capability to automaticaly follow the cavity resonance frequency against environmental disturbance.
Compact Thin-disk Multipass Amplifier Tolerant of Strong Disk Thermal Distortions
Authors: Chen Hantian , Song Enmao , Dong Jing , Zhu Xiao , Wang Hailin , Zhu Guangzhi
Published: September 2020

A thin-disk multipass amplifier with good stability for the thermal lensing of disk is presented. Simulations and experiments demonstrated slight beam variations on the disk of which the dioptric power varies in a wide range.
Determination of Femtosecond Laser Direct Written Waveguide Refractive Index Using Machine Learning
Authors: Wang Mohan , Huang Sheng , Wu Jingyu , Zhao Kehao , Mao Zhi-Hong , Chen Kevin P.
Published: September 2020

A machine learning-based model was trained on beam propagation simulation data of a femtosecond laser direct written 1-D waveguide array structure with varying refractive indices, to predict the refractive index difference of laser-induced waveguide.
Phase Offset Locking of 689 nm Laser for the Cold Sr Atoms
Authors: Zhang Shengnan , Singh Yeshpal , Bongs Kai
Published: September 2020

Phase offset locking between two 689 nm diode lasers is performed. The frequency variation of the beat note is suppressed within 0.2 Hz when it’s offset locked, which is approximately 8 orders of magnitude smaller than that of free running case. The phase noise within 400 kHz has been reduced with a maximum value of 30 dB at 100 Hz. The locked laser has been successfully applied for the red MOT of Sr.
Dual-Comb Swept Wavelength Interferometry
Authors: Mazur Mikael , Fontaine Nicolas K. , Karlsson Magnus , Andrekson Peter A. , Torres-Company Victor , Schröder Jochen
Published: September 2020

We demonstrate a hybrid swept wavelength interferometry - dual-comb spectroscopy system for fast broadband full-field measurements. Phase and amplitude retrieval is experimentally verified and compensation of laser sweep nonlinearity is demonstrated without external referencing.
Pump frequency noise influence on a microresonator-based soliton frequency comb
Authors: Tetsumoto Tomohiro , Yeo Mark , Rolland Antoine
Published: September 2020

By compensating the pump laser noise of a 300 GHz microresonator soliton comb, we analyze its impact on each comb line as well as the repetition rate. We demonstrate a timing noise of 200 as/Hz1/2.
Narrow Linewidth Electro-Optic Modulator Based Comb Generation with a Simple Modulator Configuration
Authors: Kashiwagi Ken , Okubo Sho , Inaba Hajime
Published: September 2020

We demonstrate a narrow linewidth electro-optic modulator based frequency comb with a simple modulator configuration. It was achieved by a servo control of a fragment of a high- frequency modulation signal through a low-frequency voltage-controlled oscillator.
Enhancement of the response of an intracaviy mode-locked phase sensor
Authors: Hendrie James , Hsu Ning , Arissian Ladan , Lenzner Matthias , Diels Jean-Claude
Published: September 2020

A factor of 2 enhancement of the sensitivity of a mode-locked laser gyroscope is experimentally demonstrated. This enhancement is achieved through a resonant dispersion applied to all modes of the frequency comb.
In-situ loss measurements of silicon nano-waveguides using spectrum analysis and silver nano-wire as an obstacle in a reflection-based scattering NSOM
Authors: Sun Yi-Zhi , Yan Xiao-Hong , Wei Hong , Blaize Sylvain , Bachelot Renaud , Ding Wei
Published: September 2020

An in-situ waveguide loss measurement technique using a reflection-based scattering NSOM is developed. Putting a vibrating probe in different places along the waveguide, we accurately acquire local loss values of different segments of silicon nano-waveguides.
Counterpropagating Pair of Superluminal Raman Lasers without Cross-Talks for Ultrasensitive Rotation Sensing
Authors: Zhou Zifan , Zhou Minchuan , Shahriar Selim M.
Published: September 2020

We have demonstrated a pair of counter-propagating superluminal Raman lasers without cross-talk, employing two different gain cells, each containing two isotopes of Rb, as a key step in realizing an ultrasensitive rotation sensor.
Time-offset measurement with dual-comb linear optical sampling and time interval counter
Authors: Abuduweili Abulikemu , Chen Xing , Ma Wenbo , Zhang Zhigang
Published: September 2020

We demonstrate a sub-picosecond resolution time-offset comparison over 100 km long fiber between using asynchronized dual-comb linear optical sampling and the time interval counter.
Octave-spanning 1.7 pm dual-chirped optical parametric amplification by the dual pumping
Authors: Xu Lu , Nishimura Kataro , Suda Akira , Midorikawa Katsumi , Takahashi Eiji J.
Published: September 2020

We report on the generation of 103 mJ mid-infrared pulses at 1.7 pm using a BBO dual-chirped optical parametric amplification scheme (DC-OPA) and discuss the octave-spanning DC-OPA by using the dual pumping scheme.
Large-Area Ultra-Broadband Achromatic Flat Lens for Imaging in the SWIR
Authors: Banerji Sourangsu , Meem Monjurul , Majumder Apratim , Dvonch Curt , Rodriguez Berardi Sensale , Menon Rajesh
Published: September 2020

We demonstrate an achromatic multi-level diffractive lens, which has a focal length of 25 mm, the aperture diameter of 8.93 mm, and thickness of 2.6 pm operating in the SWIR band (875 nm - 1675 nm).
Mobile quantum gravimeter with a novel pyramidal magneto-optical trap
Authors: Wu Xuejian , Weiner Storm , Pagel Zachary , Malek Bola S. , Muller Holger
Published: September 2020

We demonstrate a mobile quantum gravimeter measuring tidal gravity variations in the laboratory and surveying gravity in the field. With simplicity and sensitivity, our instrument paves the way for bringing quantum sensors to field applications.
Experimental demonstration of in-service security monitoring using a quantum modulated signal
Authors: Gong Yupeng , Yang Shuai , Hunt Jeffrey. H. , Wonfor Adrian , Penty Richard , White Ian
Published: September 2020

We experimentally demonstrate a method for in-service optical physical layer security monitoring with vacuum-noise sensitivity that can detect a 1% fiber tapping attack at 50km without classical security loopholes.
Localizing a Topological Mode Using a Near-Conservation of the Valley Degree of Freedom
Authors: Li Yandong , Yu Yang , Liu Fengyu , Zhang Baile , Shvets Gennady
Published: September 2020

We demonstrate the energy localization at the end of an abruptly terminated topologically nontrivial waveguide. This localization relies on a near-conservation of the valley degree of freedom and does not require time-reversal symmetry breaking.
Photonic topological phase transition with phase-change materials
Authors: Uemura Takahiro , Chiba Hisashi , Yoda Taiki , Moritake Yuto , Tanaka Yusuke , Notomi Masaya
Published: September 2020

We propose and demonstrate a way to accomplish photonic topological phase transition by a specially-arranged photonic crystal slab selectively loaded by a phase-change material: Ge2Sb2Te5 (GST) or Ge2Sb2Se4Tei (GSST), which enables reconfigurably tunable edge modes.
Tuning the Speed of Optical Coherence in Free Space
Authors: Yessenov Murat , Abouraddy Ayman F.
Published: September 2020

We introduce the concept of ‘coherence group velocity’, which is the speed of the peak of the coherence function and demonstrate experimentally that incorporating spatio-temporal spectral structure into a field allows tuning its coherence group velocity in free space.
Deep Convolutional Neural Network for the Inverse Design of Layered Photonic Structures
Authors: Unni Rohit , Yao Kan , Zheng Yuebing
Published: September 2020

We report a neural network trained for the inverse design of layered planar photonic structures, able to handle arbitrary incidence conditions and high spectral complexity using a selection of candidate materials in the design.
A Theoretical Explanation for Enhanced Nonlinear Response in Epsilon-Near-Zero Media
Authors: Solis Diego M. , Engheta Nader
Published: September 2020

We theoretically investigate the effects of a material’s linear permittivity e on its nonlinear response, showing that conversion efficiency increases as e decreases, consistent with other groups’ measurements of unusually high effective nonlinear refractive index in transparent conducting oxides.
All-dielectric Tunable Metasurface Based on Guide-Mode Resonance and ENZ Effects
Authors: Qiu Xiaoming , Yang Fan , Li Yanping , Zhang Fan
Published: September 2020

A guide-mode resonance-based Indium Tin Oxide electrical tunable metasurface is proposed. By forming two metal-oxide-semiconductor capacitors in a single period, resonance wavelength can be tuned larger than 20nm in near-IR spectral range.
Zero-energy Corner States in a Non-Hermitian Quadrupole Insulator
Authors: Yu Yang , Shvets Gennady
Published: September 2020

We find a zero-energy corner state in a non-Hermitian quadrupole insulator without an Hermitian counterpart, and the response of the system near zero energy can be drastically different from Hermitian systems.
Connecting Floquet Crystals and Time Crystals
Authors: Yu Yang , Shvets Gennady
Published: September 2020

We investigate the criteria of bandgaps opening in frequency or momentum, in both electtomagnetism and condensed matter models with periodic modulation in time, showing Floquet crystals and time crystals are closely related.
Dissipation of Topological Charge in Plasmonic Weyl Semimetals
Authors: Shastri Kunal , Monticone Francesco
Published: September 2020

Breaking time-reversal or inversion symmetry are two ways of realizing a Weyl semimetal. We report that, in a plasma medium with Weyl point dispersion, the time-reversal broken realization is fundamentally more resilient against losses.
Optical vortex beam splitter using topological edge state waveguide
Authors: Okada Sho , Amemiya Tomohiro , Kagami Hibiki , Saito Koichi , Tanaka Makoto , Nishiyama Nobuhiko , Hu Xiao
Published: September 2020

We propose an Si-based optical vortex beam splitter consisting of topological edge state waveguides with C6 symmetry. The device can continuously change the branching ratio of the propagate light in the range from 16% to 84%.
On-chip flexible waveguides with amorphous structures in the near-infrared
Authors: Sarihan Murat Can , Govdeli Alperen , Yilmaz Yildirim Batuhan , Erdil Mertcan , Aras Mehmet Sirin , Yanik Cenk , Wong Chee Wei , Kocaman Serdar
Published: September 2020

We have fabricated and tested on-chip waveguides using amorphous photonic structures. Amorphous structures offer greater flexibility compared to photonic crystal for photonic device designs. Furthermore, we offer a general guideline for amorphous structures.
Reconfigurable all-dielectric metasurfaces using phase-change chalcogenide Ge2 Sb2Te5
Authors: Masselink Kirsten , Abdollahramezani Sajjad , Hemmatyar Omid , Adibi Ali
Published: September 2020

We demonstrate a reconfigurable all-dielectric metasurface comprising of concentric phase-change/high-index materials nanopillars. The dynamic interplay of dominant Mie resonance modes due to the real-time phase-transition of Ge2Sb2Te5 grants 2n phase agility with unprecedented efficiency.
Electromagnetic Nonreciprocity Using Electron Beam in a Waveguide
Authors: Fallah Asma , Kiasat Yasaman , Silveirinha Mario G. , Engheta Nader
Published: September 2020

We theoretically show how the Lorentz reciprocity can be broken via inter action of electron beams with electromagnetic waves in cylindrical waveguides. Salient features such as the operating frequency range and nonreciprocity’s strength are discussed.
Tuning metasurface hologram by changing surrounding medium
Authors: Wan Weiping , Feng Hang , Gong Qihuang , Li Yan
Published: September 2020

We tune a metasuraface hologram by changing its surrounding medium to change the propagation phase experienced by the transmitted light from a nanostructure, which depends on the thickness and the transverse sizes.
Creation of a robust zero mode at will
Authors: Ramezani Hamidreza , Mostafavi Fatemeh
Published: September 2020

We show that one can obtain a topological state in a photonic lattice by incorporating a defect and uniform amplification and absorption mechanism that satisfies a local broken parity-time symmetry condition.
Circular Dichroism in Multilayered Chiral Mid-Infrared Metamaterials
Authors: Barnard H. R. , Barr E. J. , Nash G. R.
Published: September 2020

An FDTD simulation based study of a mid-IR chiral metamaterial showing enhanced circular dichroism by stacking multiple chiral layers as well as changing the order of enantiomeric layer stacking.
Beam Steering and Dynamic Focusing by Coherent Control of Light with Light on Metasurfaces
Authors: He Fei , MacDonald Kevin F , Fang Xu
Published: September 2020

We report continuous ‘coherently controlled’ tuning of the wavefront of light scattered by phase-gradient silicon metasurfaces, which enables optical-frequency beam steering and dynamic focusing without moving parts.
1020-nm-band optical cloak using double-layered metamaterial film
Authors: Amemiya Tomohiro , Kagami Hibiki , Tanaka Makoto , Okada Sho , Nishiyama Nobuhiko , Takagi Mayu , Urakami Tatsuhiro
Published: September 2020

We propose and demonstrate a near-infrared invisibility cloaking by using a double-layered metamaterial film. 1020-nm-band light is guided so as not to hit a tungsten wire around which the film is wound.
Design of Nonlinear Absorbers via Doped ENZ Metastructures
Authors: Nahvi Ehsan , Liberal Inigo , Engheta Nader
Published: September 2020

Replacing the dielectric spacer layer in a Salisbury screen with a nonlinear doped ENZ slab, we theoretically demonstrate the possibility of obtaining a tailorable nonlinear absorber.
Polarization analysis of a supercontinuum generated in a germania-doped photonic crystal fiber
Authors: Couture Nicolas , Ostic Rachel , Reddy P. Harshavardhan , Das Shyamal , Dhar Anirban , Pal Mrinmay , Paul Mukul Chandra , Kar Ajoy Kumar , Menard Jean-Michel
Published: September 2020

We investigate experimentally the effect of input polarization and pulse energy on the generated supercontinuum. Our detection system reveals the polarization properties of the supercontinuum, a typically unexplored parameter of these sources.
Two-octave Supercontinuum Generation of OAM Mode in Air-core AS2S3 Ring Fiber
Authors: Wang Yingning , Fang Yuxi , Geng Wenpu , Jiang Jicong , Wang Zhi , Zhang Hao , Bao Changjing , Huang Hao , Ren Yongxiong , Pan Zhongqi , Yue Yang
Published: September 2020

Two-octave supercontinuum of light-carrying orbital angular momentum is generated by launching a 100-fs 35-kW hyperbolic secant pulse in 10-mm air-core AS2S3 ring fiber, covering 5219 nm bandwidth from 1422 nm to 6713 nm at -45dB.
Mid-Infrared Dual-Comb Fiber Laser from 3.2 to 4.4 μm
Authors: Nakajima Yoshiaki , Hata Yuya , Kusumi Yugo , Yoshii Kazumichi , Minoshima Kaoru
Published: September 2020

Mid-infrared dual-comb fiber laser employing a high-coherence, ultra-broadband bidirectional fiber laser and periodically poled lithium niobate waveguides was developed for practical dual-comb spectroscopy. Mid-infrared generation with a broad spectrum range of 3.2-4.4 μm was demonstrated.
Pre-chirp managed and circularly polarized fiber amplification using chirped mirrors for pulse compression
Authors: Zhang Yao , Chen Runzhi , Huang Hangdong , Teng Hao , Fang Shaobo , Zhu Jiangfeng , Wang Junli , Chang Guoqing , Wei Zhiyi
Published: September 2020

We demonstrate an Yb-fiber based pre-chirp managed amplification system that emits 50-MHz, 47-fs pulses with 101.2-W average power. Using chirped mirrors as a compressor, we achieve 98% throughput efficiency.
MXene-based all-optical microfiber knot resonator for active Q-switching
Authors: Wu Q. , Zhang M. , Wang Y. , Huang W. , Zheng Z. , Zhang H.
Published: September 2020

We report an all-optical modulator based on a MXene-deposited microfiber knot resonator, and apply it in an erbium-doped fiber as an active Q-switch for microsecond pulse generation.
Polarization dependent noise suppression for fiber distributed acoustic sensor with birefringence estimation
Authors: Liu Yujia , Li Hao , Liu Tao , Fan Cunzheng , Yan Zhijun , Liu Deming , Sun Qizhen
Published: September 2020

We propose and demonstrate a fiber distributed acoustic sensing demodulation scheme based on dynamic birefringence estimation. The phase noise was effectively suppressed about 9.5dB at the fading channels in experiment.
Single-mode Ti:sapphire Crystal Fiber
Authors: Yang Teng-I , Lin Yu-Chan , Li Yi-Hsun , Liu Hou-Ting , Wang Shih-Chang , Chuang Kai-Hsiang , Chou Tzu-Chi , Huang Sheng-Lung
Published: September 2020

We report on the fabrication and characterization of single-mode Ti:sapphire crystalline fibers. Using dip coating and high-temperature sintering at 1650 °C, solid-state single crystal growth was observed, and single-crystalline cladding was formed.
All-fiber, all-optical modulator based on Michelson interferometer structure
Authors: Zhu M. , Zhang M. , Wu Q. , Zheng Z.
Published: September 2020

We demonstrate an all-optical modulator based on a fiber-type Michelson interferometer. This modulator, fabricated utilizing a microfiber deposited with carbon nanotubes, shows a large modulation depth >29 dB and a slop efficiency of 0.0504 n/mW.
Image-Recognition Assisted Infrared Femtosecond Laser Direct-Writing Method for Silica Fiber Bragg Gratings
Authors: Yu Yanjiang , Han Feng , Sun Wenjuan , Feng Xian , Shi Jindan
Published: September 2020

We present a highly reproducible fiber Bragg grating (FBG) fabrication approach using IR femtosecond laser direct-writing method with the assistance of image-recognition technique for automatically positioning grating microstructure inside fiber core.
Cross Talk and Interference in MIMO less Few Mode Transmission Systems
Authors: Mathew Neethu Mariam , GrUner-Nielsen Lars , Galili Michael , Lillieholm Mads , Rottwitt Karsten
Published: September 2020

We show that the performance of mode division multiplexed systems is de graded by both cross talk and interference. The effect of interference can be mitigated by using different wavelengths for the different modes.
Pulsating internal oscillation of soliton molecules in passively mode-locked fiber lasers
Authors: Xia Ran , Luo Yiyang , Shum Perry Ping , Liu Yusong , Ni Wenjun , Sun Qizhen , Zhao Luming , Tang Xiahui
Published: September 2020

We report on the experimental observation of pulsating internal oscillation of soliton pairs featuring twofold relative phase evolution. These results could enrich the transient dynamics of soliton complexes and fuel the molecular analogy.
All normal dispersion fiber laser with bandwidth tunable fiber based spectral filter
Authors: Khanolkar Ankita , Ge Xiaowei , Chong Andy
Published: September 2020

We have demonstrated a stable ytterbium mode-locked fiber laser with an all fiber, bandwidth tunable spectral filter which can generate mode-locked spectrums of different shapes and bandwidth.
Dual-pulse Complex Superposition Based Noise Suppression for Distributed Acoustic Sensing
Authors: Li Hao , Liu Yujia , He Tao , Fan Cunzheng , Liu Tao , Yan Zhijun , Liu Deming , Sun Qizhen
Published: September 2020

A noise suppression method for distributed acoustic sensing based on the dual-pulse coherent detection is proposed and demonstrated. Through the complex superposition of two different frequency pulses, a maximum noise reduction of 15dB is realized.
Nanometer Precision Measurement of Submicron Fibers via Seeded Four-Wave-Mixing
Authors: Hammer Jonas , Häupl Daniel R. , Russell Philip St.J. , Joly Nicolas Y.
Published: September 2020

We report non-destructive measurement of the diameter of submicron air-clad waveguides to nanometer precision, based on parametric amplification of a broadband seed signal. Ultrashort pump and seed pulses allow the diameter to be longitudinally resolved.
Optical Pulse Generation with Versatile Time-Varying Polarization States
Authors: Lopez Aviles H. E. , Keyser C. K. , Martin R. K. , Nguyen K. , Adams A. M. , Christodoulides D. N.
Published: September 2020

We experimentally demonstrate a novel fiber-based LiDAR polarimetric system capable for a complete set of polarimetric measurements without invoking complex external components.
Fabrication of chalcogenide transversely disordered optical fiber for mid-infrared image transport
Authors: Nakatani Asuka , Tuan Tong Hoang , Isai Hayato , Matsumoto Morio , Sakai Goichi , Suzuki Takenobu , Ohishi Yasutake
Published: September 2020

We successfully fabricated a transversely disordered optical fiber made of chalcogenide glasses (AsSe2 and As2Ss) for high-resolution mid-infrared image transport. Moreover, we evaluated local confinement on the fiber using finite element method.
Enhanced Photoluminescence of Heterostructure: Energy Transfer and Nonradiative Exciton Relaxation Suppression
Authors: Luo Yang , Shan Hangyong , Gao Xiaoqing , Qi Pengfei , Fang Zheyu
Published: September 2020

The exciton dynamics from the aspect of acceptor is revealed by the time-resolved differential reflection measurement and the enhanced photoluminescence of heterostructure is achieved by energy transfer and the suppression of exciton-exciton annihilation.
Symmetry Properties of Harmonics Generated in SingleCrystal Chalcogenides Using Ultrafast Mid-Infrared Pulses
Authors: Schweinsberg Aaron , Tripepi Michael , Talisa Noah , Vanderhoef Laura , Wolfe Christopher , Hastings Michael , Kolesik Miroslav , Valenzuela Anthony , Chowdhury Enam
Published: September 2020

We focus intense, ultrashort, 3.6 micron-wavelength pulses into three single-crystal zincblende chalcogenide samples, ZnS(100), ZnS(110), and ZnSe(100). Symmetry properties of the generated harmonics are studied by rotating the crystals and measuring the output polarization.
Optimisation of a Femtosecond Pulse Synthesiser for High Harmonic Generation Using the Semi-Classical Model
Authors: Pettipher Allan J. , Weaver Bruce , Greening Daniel , Li Feng , Turner James , Marangos Jon P. , Tisch John W. G.
Published: September 2020

By tailoring the driving electric field at the sub-cycle level, high harmonic generation (HHG) can be enhanced. We use the semi-classical model to configure a three-colour femtosecond field synthesiser to deliver optimised waveforms for HHG.
Optimization of probe time delays in hybrid femtosecond/picosecond vibrational coherent anti-Stokes Raman scattering thermometry
Authors: Zhao Huijie , Tian Ziyang , Wu Tao , Li Yan , Wei Haoyun
Published: September 2020

We propose a method that utilizes optimized probe time delays of 10 to 35 ps in hybrid femtosecond/picosecond vibrational coherent anti-Stokes Raman scattering thermometry and maximize sensitivity for temperatures from 300 to 2500 K.
Supercontinuum generation in dispersion-engineered PECVD SiN waveguides for a Yb-fiber laser frequency comb
Authors: Feigenson Thomas , Johnsen Kelsey , Kharas Dave , Shin Wonseok , Maxson Ryan , Bagnall Kevin , Libson Adam , Benedick Andrew , Loh William , Sorace-Agaskar Cheryl , Braje Danielle , McConnell Robert , Hong Kyung-Han
Published: September 2020

We present the development of a self-referencing Yb-fiber laser frequency comb based on octave-spanning supercontinuum generation from dispersion-engineered silicon nitride waveguides, fabricated with the standard, readily available plasma-enhanced chemical vapor deposition (PECVD) process.
Width dependent disorder and many-body effects in gallium arsenide quantum wells
Authors: Perez Cesar , Reno John L. , Cundiff Steve
Published: September 2020

We study many body effects and disorder in both narrow and wide quantum wells with two-dimensional coherent spectroscopy. The inhomogeneous linewidth, homogeneous linewidth, and exictation induced dephasing depend on width in AlGaAs/GaAs quantum wells.
Ultrafast carrier dynamics spectrogram of semiconductor optical amplifier
Authors: Yang Ningning , Chen Liao , Li Lun , Liu Chen , Dong Xin , Zhang Chi , Zhang Xinliang
Published: September 2020

An ultrafast temporal spectrum analyzer based on asynchronous optical sampling and dispersive time-stretch is demonstrated with 592.5-fs sampling resolution, 21-nm bandwidth, and 0.214-nm spectral resolution, and characterizes the ultrafast carrier dynamics of semiconductor optical amplifier.
Dual-channel laser system with gap-less tuning from 250 - 1300 nm at megahertz repetition rates for time-resolved photoelectron-emission microscopy and spectroscopy
Authors: Schulz Michael , Buss Jan-Heye , Golz Torsten , Grguras Ivanka , Prandolini Mark , Indorf Gregor , Braatz Thomas , Riedel Robert
Published: September 2020

A dual-channel, high-power laser system with gap-less dining from 250 - 1300 nm at 30 - 50 femtoseconds pulse duration is presented as the ideal tool for time-resolved photoemission microscopy and spectroscopy experiments.
N2+-lasing Induced by Filamentation in Air for Femtosecond Coherent Anti-Stokes Raman Spectroscopy
Authors: Zhao Xiaodong , Nolte Stefan , Ackermann Roland
Published: September 2020

We investigated both ultrashort pulse filamentation and lasing action of N2+ for pump-probe experiments. The CARS signals of air and CO2 were detected with the lasing pulse of N2+ as a probe.
Ultrasfast Phase Imaging by Singe-Shot Chirped Pulse Digital Holography
Authors: Karasawa Naoki , Yamada Shogo , Kanaya Hiroki
Published: September 2020

Single-shot chiped pulse digital holography was proposed recently for recording multiple ultrafast wavefronts. We obtained phase images of spark discharge using two 35 fs probe pulses separated by 3.7 ps successfully by this method.
Ultrafast soliton dynamics of micro-combs observed by aberration-free temporal magnifier
Authors: Chen Liao , Zhao Yanjing , Wang Weiqiang , Hu Hao , Wang Ruolan , Wang Xinyu , Chu Sai T. , Little Brent , Zhang Chi , Zhang Wenfu , Zhang Xinliang
Published: September 2020

Ultra-fast soliton dynamics of micro-combs are investigated based on an aberration-free temporal magnifier. By eliminating aberrations, temporal window is greatly extended to 1.4 ns and transient phenomena are clearly observed including soliton annihilation and mergence.
Optical parametric oscillators (OPOs) with 3-5 pm instantaneous bandwidth based on an aperiodically-poled lithium-niobate (APPLN) crystal
Authors: Liu Pei , Heng Jiaxing , Ning Chengxiao , Zhang Zhaowei
Published: September 2020

We reported an OPO generating an idler wave with an instantaneous bandwidth covering the atmospheric transmission window at 3-5 pm based on an APPLN crystal and revealed a novel pulse-formation mechanism in this system.
Control of delay lines with reinforcement learning for coherent pulse stacking
Authors: Abuduweili Abulikemu , Yang Bowei , Zhang Zhigang
Published: September 2020

We demonstrate the effectiveness of reinforcement learning for controlling the feedback of delay line coherent pulse stacking.
1 kHz, 32 mJ pulses at 2.05 pm from multi-pass Ho: YLF amplifiers for pumping an 8 pm OPCPA
Authors: Zhou Fangjie , Murari Krishna , Wu Yi , Yin Yanchun , Weaver Bruce , Avni Timur , Larsen Esben , Chang Zenghu
Published: September 2020

We present a multi-pass Chirped Pulse Amplification system using Ho:YLF that can produce 32 mJ pules at 2.05 pm and 1 kHz repetition rate. The seed is generated from DC-OPA driven by a Ti:Sapphire laser.
Direct Evidence of Drift-Assisted Carrier Transportation in a Gradient-Doped GaAs Photocathode
Authors: Zhou Rui , Jani Hemang , Duan Lingze
Published: September 2020

We report a comparative study of free-electron dynamics in uniform-doped and gradient- doped GaAs photocathodes using femtosecond pump-probe transient reflectometry. The result shows better photoelectron accumulation in gradient-doped device, evidently due to drift-assisted carrier transportation.
Effect of Mode-Area Dispersion on Ultrafast Nonlinear Dynamics in Gas-Filled Anti-Resonant Hollow-Core Fibers
Authors: Wan Ying , Hasan Md Imran , Shum Perry Ping , Chang Wonkeun
Published: September 2020

We numerically investigate the effect of mode-area dispersion on nonlinear pulse propagation dynamics in gas-filled anti-resonant hollow-core fibers. We find that this effect becomes nonnegligible when the system is pumped close to the zero dispersion.
SnSe2 Nanosheets for Subpicosecond Harmonic Mode-Locked Pulse Generation
Authors: Liu Jishu , Li Xiaohui
Published: September 2020

The SnSe2 nanosheets fabricated by using solvothermal treatment have been successhrlly prepared as fiber-based saturable absoiber by utilizing evanescent-field effect which can bear a high pump power. A 31st order subpicosecond harmonic-mode-locking has been generated.
Generation of a Spatiotemporal Vortex with a Purely Transverse Orbital Angular Momentum
Authors: Chong Andy , Wan Chenhao , Chen Jian , Zhan Qiwen
Published: September 2020

We demonstrate a spatiotemporal optical vortex with a purely transverse orbital angular momentum. Since the spatiotemporal vortex carries a scalable orbital angular momentum in the unique transverse direction, novel applications are expected.
Electroluminescence by Impact Excitation of Excitons in a Monolayer WSe2
Authors: Feng Jiabin , Li Yongzhuo , Fu Song , Zhang Jianxing , Sun Hao , Gan Lin , Ning C.Z
Published: September 2020

We demonstrated exciton electroluminescence by impact excitation in a monolayer WSe2 based field effect transistor on SiO2/Si substrate at room temperature. Hot electrons or holes can be controlled as impact sources through the back gate.
Wavelength Scaling of Photoionization of Size-Dependent Dielectric Nanoparticles
Authors: Powell J. , Summers A. , Kling M.F. , Rolles D. , Trallero-Herrero C. , Rudenko A.
Published: September 2020

We present the effects of wavelength scaling on the photoelectron cutoff energy of laser- driven dielectric nanoparticles. Results indicate a complex mix of ponderomotive scaling, field enhancement and charge interactions dictate photoionization and subsequent electron propagation.
High Harmonic Generation from Thin-film LiNbO3
Authors: Gholam-Mirzaei Shima , Crites Erin , Journigan Troie , Turkowski Volodymyr , Sjaardema Tracy , Fathpour Sasan , Chini Michael
Published: September 2020

High-order harmonic spectroscopy is a powerful tool for studying structural symmetries in solids. Here, we study the orientation dependence and polarization of high-order harmonics generated from LiNbO3 thin films driven by femtosecond mid-infrared laser pulses.
Video-rate three-photon imaging of awake mouse brain
Authors: Li Bo , Wang Mengran , Wu Chunyan , Charan Kriti , Xu Chris
Published: September 2020

We demonstrate three-photon imaging of brain activity in awake mice, achieving 30 frames/s at 512x512 pixels per frame and 620x620 pm field-of-view (FOV) at 750 pm depth.
Camera-Array 25-Plane Multifocus Microscope For Ultrafast Live 3d Imaging
Authors: Hirata-Miyasaki Eduardo , Pettersson Gustav M. , Zaw Khant , John Demis D. , Thibeault Brian , Lynch Brandon , Hernandez Juliana , Abrahamsson Sara
Published: September 2020

We demonstrate an ultrafast Multifocus 25-camera-array microscope (M25) for truly simultaneous 3D imaging of 25 focal planes of a living specimen. Customized for functional neural circuit imaging, our M25 prototype captures 130x130x50um3 volumes at >100Hz.
Simultaneous stimulated Raman gain and loss detection (SRGAL)
Authors: Heuke Sandro , Lombardini Alberto , Büttner Edlef , Rigneault Hervé
Published: September 2020

The fidelity of stimulated Raman scattering (SRS) microscopy images is impaired by artifacts such as thermal lensing, cross-phase modulation and multi-photon absorption. These artifacts affect differently the stimulated Raman loss (SRL) and stimulated Raman gain (SRG) channels making SRL and SRG image comparisons attractive to identify and correct SRS image artifacts. To provide answer to the question: "Can I trust my SRS images?", we designed a novel, but straightforward SRS scheme that enables the dectection of the stimulated Raman gain and loss (SRGAL) simultaneously at the same pixel level. As an advantage over the conventional SRS imaging scheme, SRGAL doubles the SRS signal by acquiring both SRL as well as SRG and allows for the identification of SRS artifacts and their reduction via a balanced summation of the SRL and SRG images.
Fullwave Maxwell inverse design of axisymmetric, tunable, and multi-scale multi-wavelength metalenses
Authors: Christiansen Rasmus E. , Lin Zin , Roques-Carmes Charles , Salamin Yannick , Kooi Steven E. , Joannopoulos John D. , Soljačić Marin , Johnson Steven G.
Published: September 2020

We demonstrate new axisymmetric inverse-design techniques that can solve problems radically different from traditional lenses, including reconfigurable lenses (that shift a multi-frequency focal spot in response to refractive-index changes) and widely separated multi-wavelength lenses (λ = 1 µm and 10 µm). We also present experimental validation for an axisymmetric inverse-designed monochrome lens in the near-infrared fabricated via two-photon polymerization. Axisymmetry allows fullwave Maxwell solvers to be scaled up to structures hundreds or even thousands of wavelengths in diameter before requiring domain-decomposition approximations, while multilayer topology optimization with ∼105 degrees of freedom can tackle challenging design problems even when restricted to axisymmetric structures.
Tunable microlens array fabricated by a silicone oil-induced swelled polydimethylsiloxane (PDMS) membrane bonded to a micro-milled microfluidic chip
Authors: Chen Pin-Chuan , Chen Liang-Ta , Yeh Cing-Sung
Published: September 2020

Microlens arrays (MLAs) nowadays are critical micro-optical components and they can be applied in many application fields, such as optical communication systems and flat panel display modules. This article describes a novel approach to the fabrication of tunable, highly reliable, and uniform polydimethylsiloxane (PDMS) MLAs. A polydimethylsiloxane (PDMS) membrane is bonded to a micro-milled poly(methyl methacrylate) (PMMA) microfluidic chip and exposed to silicone oil of a specific viscosity. Molecules in the oil insert themselves into the molecular structure of the PDMS membrane, causing it to swell and subsequently form dome-shaped MLAs. From our experiments, we derived the following conclusions. First, the homogeneous swelling of the PDMS resulted in MLAs with a high numerical aperture (0.5), high uniformity illumination (CV of the illumination intensity is between 2.5%∼5.1%), and high uniformity (CV of sag height of MLAs is less than 0.05). Second, the shorter molecular chains in low-viscosity oils diffused more readily into the PDMS membrane, which increased the effects on swelling, resulting in MLAs with higher sag height and higher numerical aperture. For example, the 5 cst silicone oil resulted in sag height of 191 µm with NA of 0.50, whereas the 100 cst silicone oil resulted in sag height of 86 µm with numerical aperture of 0.33. Finally, the integrated mixer module enabled the simultaneous tuning of the 7 × 7 MLAs simply by adjusting the injection flow rates of the constituent silicone oils.
VECSEL-based virtually imaged phased array spectrometer for rapid gas phase detection in the mid-infrared
Authors: Rockmore Robert , Gibson Ricky , Moloney Jerome V. , Jones R. Jason
Published: September 2020

We present a novel, to the best of our knowledge, system for high-resolution, time-resolved spectroscopy in the mid-wave infrared based on a modelocked vertical external cavity surface emitting laser (VECSEL) frequency comb coupled to a virtually imaged phased array (VIPA) spectrometer. The GHz level repetition rate of VECSEL-based systems coupled to VIPA spectrometers enables comb tooth resolved spectra without the use of additional filter cavities often required to increase comb tooth spacing. We demonstrate absorption spectroscopy on a methane (

C
H

4

) gas mixture at

2900

c
m

−
1

(3.4 µm) with over

35

c
m

−
1

spectral bandwidth in a single image. Rapid time-resolved measurements were made using a 300 µs exposure time with an acquisition rate limited to 125 Hz by the available camera. High-resolution absolute frequency measurements were performed by scanning the repetition rate of the VECSEL frequency comb.
Two-dimensional tin diselenide nanosheets pretreated with an alkaloid for near- and mid-infrared ultrafast photonics
Authors: Wang Zhenhong , Zhang Bin , Hu Bing , Li Zhongjun , Ma Chunyang , Chen Yu , Song Yufeng , Zhang Han , Liu Jun , Nie Guohui
Published: September 2020

Two-dimensional (2D) tin diselenide (

Sn

Se
2

), a novel layered material with excellent optical and electronic properties, has been extensively investigated in various promising applications, including photodetectors, optical switching, and ultrafast photonics. In this work,

Sn

Se
2

nanosheets have been obtained after pretreatment in an alkaloid, exhibiting high optical absorption and electron-enriched properties. Besides, the performances of the prepared

Sn

Se
2

in near-infrared (NIR) and mid-infrared (MIR) ultrafast photonics are presented. Notably, by employing the

Sn

Se
2

-deposited microfiber device as a saturable absorber (SA) exhibiting typical nonlinear optical absorption properties, stable ultrashort pulses and rogue waves are realized in an erbium-doped fiber laser. Furthermore, the

Sn

Se
2

-deposited SA device is also applied to a thulium-doped fiber laser to achieve stable ultrashort pulses. This study indicates that

Sn

Se
2

is expected to be a suitable candidate for ultrafast fiber lasers in the NIR and MIR regions.
The faster the better? Examining the effect of live-blogging on audience reception
Authors: Lee Angela M.
Published: September 2020

Through an online experiment, this study examines the impact of live-blogging on audiences’ perception of readability, selective scanning, news credibility, news use and paying intent (N = 220). Contrary to industry expectation, this study found that the quest for speed at the expense of errors (and subsequent corrections) has no effect on the outcome variables, except news presented in the live-blogging format decreases readability. In contrast, news interest predicts all outcome measures. Findings from this study carry theoretical and practical implications for online news production and consumption.
Combinação de atributos naturais e antrópicos na definição do potencial de contaminação de aquíferos, sudeste do Brasil
Authors: Costa Carlos Wilmer , Lorandi Reinaldo , Di Lollo José Augusto , Serikawa Vagner de Souza
Published: September 2020

Com o comprometimento da disponibilidade dos mananciais superficiais e o uso intenso dos mananciais subterrâneos para abastecimento, as unidades aquíferas estão cada dia mais expostas a riscos de contaminação. Diante disso, combinar atributos naturais às influências antrópicas é uma estratégia adequada para a avaliação potencial de contaminação de aquíferos. O trabalho apresenta cartas de potencial de contaminação de aquíferos na bacia hidrográfica do Rio Claro (251,91km2, Santa Rita do Passa Quatro, SP) em escala 1:50.000, considerando as unidades aquíferas presentes, informações de geologia de superfície, materiais inconsolidados e declividade dos terrenos; combinados com uso e cobertura da terra, via análise multicritério em ambiente SIG. As classes de potencial “alto” e “muito alto” (46,1% em 1994 e 48,6% em 2014) foram as mais representativas na área. Os potenciais de contaminação obtidos expressaram claramente a importância dos atributos geológicos na área. As mudanças de uso e cobertura da terra identificadas no período foram determinantes para que o potencial de contaminação dos aquíferos aumentasse consideravelmente. A adoção de medidas de controle do uso/cobertura da terra e melhorias no manejo do solo são alternativas para a proteção das águas subterrâneas nesta bacia hidrográfica
The Debate of Orthodox Sufism and Philosophical Sufism: The Study of Maqāmāt in the Sirāj al-Ṭālibīn of Shaykh Iḥsān Jampes
Authors: Ni'am Syamsun
Published: September 2020

This article discusses the mystical view of Shaykh Iḥsān Jampes Kediri, East Java. He is known as a muslim jurist as well as a practical Sunnī Sufi of Nusantara (Indonesia), with a worldwide reputation. The main reason for his reputation originates from his monumental work Sirāj al-Ṭālibīn a voluminous commentary of al-Ghazālī work, Minhāj al-’Ābidīn, which had successfully reaffirmed orthodox Sunnī sufism that built and developed by al-Ghazālī. The sufism attitudes and ways of Shaykh Iḥsān in the journey were as if dealing with a sufi group which had philosophical pattern. Additionally, Shaykh Iḥsān Jampes in Sirāj al-Ṭālibīn reviewed the sufistic core stages which are called maqāmāt by many sufis, but Shaykh Iḥsān calls them steep road (‘aqabah) consisting of seven steep stages. These differences bring some consequences not only on the number of steps/stairs/maqām and the final destination of his mystical journey, namely gnosis and deification; but also question the limit of human being who physically cannot be united with God. On the other hand, God could have chosen to be invited to unite in accordance with His will. These seven ‘aqabah are to deliver a traveller towards ma’rifatullāh (gnosis) as the ultimate mystical journey.[Artikel ini membahas pandangan sufistik Syaykh Iḥsān Jampes Kediri Jawa Timur. Ia adalah ahli hukum Islam yang juga sebagai praktisi sufi sunni yang terkenal di nusantara kala itu. Alasan utama yang membuatnya diperhitungkan adalah karyanya Sirāj al-Ṭālibīn yang berupa komentar terhadap Minhāj al-’Ābidīn karya al-Ghazālī. Sikap dan jalan sufi Shaykh Iḥsān Jampes tampaknya bersepakat dengan pola sufistik falsafati. Dalam karyanya tersebut ia membahas tingkatan yang oleh para sufi biasa disebut maqāmāt, dimana ia sendiri menyebutnya dengan jalan terjal (‘aqabah) yang terdiri dari 7 tingkatan. Perbedaan ini tidak hanya membawa perbedaan konsekuensi jumlah tangga dan tujuan akhir (gnosis dan deification), tapi juga soal batasan kemampuan fisik manusia untuk menyatu dengan Tuhan. Di sisi lain, Tuhan dapat juga mengundang untuk bersatu berdasarkan kehendakNya. Tujuh tingkatan ‘aqabah inilah yang akan membawa para musafir menuju ma’rifatullāh sebagai puncak perjalanan spiritual.]
Perbandingan Algoritma Contraharmonic Mean Filter dan Arithmetic Mean Filter untuk Mereduksi Exponential Noise
Authors: Furqan Mhd , Sriani Sriani , Siregar Yuli Kartika
Published: September 2020

Noise in the image caused a decrease in image quality, so that the image will look dirty and spots appear on the resulting image. Noise also results in reduced information on the resulting image so that noise limits valuable information when image analysis is performed. Filtering technique is one way to overcome noise. The filtering technique used in this study is using the Contraharmonic Mean Filter algorithm and the Arithmetic Mean Filter algorithm with the type of noise used to reduce the Exponential Noise. The results of the two algorithms show that the Arithmetic Mean Filter algorithm is a better algorithm to reduce the Exponential Noise compared to the Contraharmonic Mean Filter algorithm which is proven based on the value of MSE (Mean Square Error) and PSNR (Peak Signal-to-Noise Ratio).
Geraint Ellis, Discourses of Objection: Towards an Understanding of Third-party Rights in Planning, “Environment and Planning A: Economy and Space” 2004, vol. 36 (by Piotr Szulc)
Authors: Szulc Piotr
Published: September 2020

Geraint Ellis, Discourses of Objection: Towards an Understanding of Third-party Rights in Planning, “Environment and Planning A: Economy and Space” 2004, vol. 36 (by Piotr Szulc)
Mariusz Mamczarek, Ochrona zbiorowych praw i interesów konsumentów, pacjentów oraz pasażerów w transporcie kolejowym. Komentarz praktyczny z orzecznictwem, seria Komentarze & Linia orzecznicza, Wydawnictwo C.H. Beck, Warszawa 2019 (opr. Paulina Jachimowic
Authors: Jachimowicz-Jankowska Paulina
Published: September 2020

Mariusz Mamczarek, Ochrona zbiorowych praw i interesów konsumentów, pacjentów oraz pasażerów w transporcie kolejowym. Komentarz praktyczny z orzecznictwem, seria Komentarze & Linia orzecznicza, Wydawnictwo C.H. Beck, Warszawa 2019 (opr. Paulina Jachimowicz-Jankowska)
Peter N. Salib, The Law of Banksy: Who Owns Street Art?, „University of Chicago Law Review” 2016, vol. 83, no. 4 (by Piotr Szulc)
Authors: Szulc Piotr
Published: September 2020

Peter N. Salib, The Law of Banksy: Who Owns Street Art?, „University of Chicago Law Review” 2016, vol. 83, no. 4 (by Piotr Szulc)