bluuebunny/crossref_metadata_2025 huggingface dataset:
A 2 × 2 Broadband Athermal Mach-Zehnder Interferometer with Sub-Wavelength Adiabatic Couplers
Authors: Mohammed Zakriya , Paredes Bruna , Rasras Mahmoud
Published: August 2021

An all-silicon thermally insensitive (-1.6 pm/0C) Mach-Zehnder interferometer (MZI) has been demonstrated over a broad range of 80 nm from 1540-1620 nm. The proposed MZI employs subwavelength grating (SWG) adiabatic couplers for splitting and combining.
Kilowatt Femtosecond Lasers for High Productivity
Authors: Pouysegur J. , Gruson V. , Ferachou D. , Loyez J. , Godin A. , Delaigue M. , Audouard E. , Mottay E. , Hönninger C.
Published: August 2021

We report on kW femtosecond lasers that will enable large scale and high productivity industrial applications. Power scaling is achieved by an Innoslab amplifier followed by slab-based booster amplifier stages. The laser concept is capable to generate high pulse energies in the multi-mJ range as well as high pulse repetition rates in the MHz or GHz ranges. Moreover, free triggering (FemtoTrig®) and burst options as well as frequency conversion to the green and UV spectral region will leverage these femtosecond lasers into future industrial applications. Also in the scientific domain these lasers will have a strong impact, e.g. as pump sources for powerful OPAs or high harmonics generation at high photon flux.
Applicability of artificial neural network for modeling and prediction of the laser polished surface quality
Authors: Wu Honghe , Bordatchev Evgueni V.
Published: August 2021

Surface quality improvement by a laser polishing (LP) process is a new innovative technology enabling value-adding functionalities, such as improving visual appearance, wettability, friction, and others through the control and reconfiguration of the surface topography. However, the resultant surface is dependent upon many process parameters which makes selecting optimal process parameters to achieve desired surface topography difficult and unrepeatable. It was proposed and demonstrated that artificial neural network (ANN) can reliably model the LP of H13 tool steel and predict the laser polished surface topography parameters, such as areal waviness and roughness, with a probability of 80%.
Laser-written freeform optics for in- and out-of-focus beam shaping
Authors: Trela-McDonald Natalia , Griffiths Alex , Diederich Gilles , Murphy Eoin
Published: August 2021

We present high efficiency, laser-written freeform optics used for single and multimode beam shaping. We investigate both, in focus intensity distribution and out of focus propagation properties to address requirements of material processing applications.
Large dynamic range athermal LNOI/TiO2 nanobeam electric field sensor
Authors: Ma Xinyu , Zhuang Chijie , Zeng Rong , Zhou Weidong
Published: August 2021

Integrated optical E-field sensor based on nanobeam cavity is reported. Theoretical Emin is 0.15 V/m. Temperature-induced resonant wavelength variation is within 3 pm/°C in the range of -40 to 40 °C.
Ring-Shaped Conoscopic Holography for Distance and Tilt Measurement
Authors: Grubert Nicole , König Georg , Stollenwerk Jochen , Loosen Peter
Published: August 2021

We present an approach for a non-contact, simultaneous tilt and distance measurement based on conoscopic holography using a ring-shaped measuring beam, where the spatial frequency and intensity of the resulting interference rings are evaluated.
High-resolution x-ray fluorescence imaging using structured illumination
Authors: Klein Y. , Sefi O. , Schwartz H. , Shwartz S.
Published: August 2021

We report a proof of principle experiment demonstrating the use of structured illumination and coincidence for x-ray fluorescence imaging at very high spatial resolution and short measurement time with a conventional x-ray tube.
Drone-Based Quantum Key Distribution
Authors: Isaac Samantha , Conrad Andrew , Rezaei Tahereh , Sanchez-Rosales Daniel , Cochran Roderick , Gutha Akash , Gauthier Daniel , Kwiat Paul
Published: August 2021

Current quantum cryptography implementations focus on fiber-based or fixed free-space point-to-point channels. We seek to expand this to quantum communication from mobile platforms. Here, we report progress towards tracking system stabilization and air-to-air signal coupling.
Multiplexed entanglement-based quantum cryptography: concept and implementations
Authors: Bohmann Martin , Ortega Evelyn , Pseiner Johannes , Achatz Lukas , Bulla Lukas , Dovzhik Krishna , Shiozaki Rodrigo , Ursin Rupert
Published: August 2021

We introduce a general scheme for increasing secure key rates in entanglement-based cryptography exploiting multiple degrees of freedom. We experimentally exemplify this scheme through spatial and wavelength multiplexing. Scalability of our approach is demonstrated.
Proof-of-Principle Frequency-Bin Quantum Key Distribution with Biphoton Frequency Combs
Authors: Sarihan Murat Can , Chang Kai-Chi , Cheng Xiang , Tsuda Hiroyuki , Wong Chee Wei
Published: August 2021

We offer a proof-of-principle photon-efficient QKD protocol based on energy-time entangled biphoton frequency combs using entangled frequency-bin pairs as qudits.
Turn-on delay in the mid-infrared quantum-cascade lasers: experiment and numerical simulations
Authors: Cherotchenko Evgenia D. , Dudelev Vladislav V. , Mikhailov Dmitry A. , Losev Sergey N. , Babichev Andrey V. , Gladyshev Andrey G. , Novikov Innokenty I. , Lutetskiy Andrey V. , Veselov Dmitry A. , Slipchenko Sergey O. , Pikhtin Nikita A. , Karachinsky Leonid Ya. , Denisov Dmitry V. , Kuchinskii Vladimir I. , Kognovitskaya Elena A. , Egorov Anton Yu. , Teissier Roland , Baranov Alexei N. , Sokolovskii Grigorii S.
Published: August 2021

Turn-on delay is measured to be much longer and its pump-current dependence different from theoretical predictions for mid-infrared InP- and InAs-based quantum-cascade lasers. Experiment qualitatively agrees with numerical simulations of rate-equations under non-zero rise-time pumping.
Ultra-fast tunable ECDL design for the MIR region
Authors: Hoppe Morten , Schmidtmann Sebastian , Honsberg Martin , Tatenguem Herve , Milde Tobias , Sacher Joachim R. , Gu-Stoppel Shanshan , Senger Frank
Published: August 2021

An ultrafast ECDL design based on a MEMS device with optimized curved gain chip at 2020 nm is presented. Results of the characterization and its use for the detection of trace gases are shown.
Quantum Dot Single-Photon Emission Coupled into Single-Mode Fibers with 3D Printed Micro-Objectives
Authors: Bremer Lucas , Weber Ksenia , Fischbach Sarah , Thiele Simon , Schmidt Marco , Kaganskiy Arsenty , Rodt Sven , Herkommer Alois , Sartison Marc , Portalupi Simone Luca , Michler Peter , Giessen Harald , Reitzenstein Stephan
Published: August 2021

We demonstrate the on-chip integration of a deterministically fabricated quantum dot micro-lens, a 3D-printed micro-objective and a single-mode fiber-coupler. The resulting quantum device has a broadband photon extraction efficiency with a coupling efficiency of 22%.
On-Chip Multi-Layer THz Power Generation with Beamforming Capability
Authors: Saeidi Hooman , Venkatesh Suresh , Lu Xuyang , Sengupta Kaushik
Published: August 2021

In this article, we propose a novel on-chip multi-layer coupled oscillator scheme to generate THz power using industry standard 65-nm CMOS process. The scalable architecture enables to generate 14 dBm effective isotropic radiated power (EIRP) in a lensless setup with beamforming capability of ±30 degrees in both E and H planes at 416 GHz. The generated coherent power is radiated through on-chip 4×4 array of patch antennas.
InP integrated photonic circuit for terahertz spectroscopy up to 4.1 THz bandwidth based on sampled grating lasers
Authors: Lee Moon-Hyeok , Nellen Simon , Soares Francisco , Moehrle Martin , Rehbein Wolfgang , Baier Moritz , Schell Martin
Published: August 2021

We present a photonic integrated circuit (PIC) for terahertz spectroscopy up to 4.1 THz comprising two SG DBR lasers and passive building blocks. The PIC has been realized on the HHI InP generic foundry platform.
Confocal Spatial frequency modulation imaging with wavelength domain modulation
Authors: Czerski John , Adams Daniel , Field Jeffrey J. , Bartels Randy , Reeves Robert , Squier Jeff
Published: August 2021

We present a novel single element detector imaging scheme in which spatial information is encoded into the spectral content of a broadband source. The technique is confocal when delivered with optical fiber.
Hyperspectral and Brightfield Imaging Combined with Deep Learning Uncover Hidden Regularities of Colours and Patterns in Biological Cells and Tissues
Authors: Goldys Ewa M.
Published: August 2021

Precise quantification of native fluorescent colours of cells and tissue and their morphology patterns allow non-invasive monitoring of biological function at a molecular level, most notably metabolism and its dysregulation. This next-generation methodology opens new options for diagnostics in neurodegeneration and cancer, reproductive medicine and ophthalmology, as well as in fundamental biological science.
Deep Learning-enabled Coherent Imaging Achieves Early Detection and Classification of Bacteria in Water Samples
Authors: Wang Hongda , Koydemir Hatice Ceylan , Qiu Yunzhe , Bai Bijie , Zhang Yibo , Jin Yiyin , Tok Sabiha , Yilmaz Enis Cagatay , Gumustekin Esin , Rivenson Yair , Ozcan Aydogan
Published: August 2021

Using deep learning and lensfree holographic imaging, we report early detection and classification of bacterial colonies in water samples. Our system detects 1 colony-forming unit (CFU) per Liter within 9 h of total test time.
High-throughput Multimodal FACED Imaging Flow Cytometry
Authors: Yip Gwinky G. K. , Lo Michelle C. K. , Lee Kelvin C. M. , Lai Queenie T. K. , Wong Kenneth K. Y. , Tsia Kevin K.
Published: August 2021

We report a high-throughput, submicron-resolution imaging flow cytometer that allows synchronized single-cell quantitative phase and fluorescence imaging and empowers deep-learning-assisted image-based cell-type classification and cell cycle tracking.
Photonic TPU & Memory for Machine Intelligence
Authors: Sorger Volker J.
Published: August 2021

Here, I introduce a Photonic TPU (P-TPU), a PIC-based ASIC for vector matrix multiplication acceleration and report on a programmable multi-level non-volatile photonic random access memory (P-RAM).
Gas Cell based on Segmented Hollow-Core Photonic Crystal Fiber and its Application in an Intracavity Absorption Spectroscopy System
Authors: Trevisanutto Joshua O. , Das Gautam
Published: August 2021

A gas cell was developed by segmenting Hollo-Core Photonic Crystal Fiber, which increased the rate at which gas could be exchanged and allowed the cell to be used in an Intra Cavity Absorption Spectroscopic system.
Multi-species measurements during shock heated hydrocarbon pyrolysis with a broadband mid-IR OPO
Authors: Greene Robert L. , Baker Jessica , Ninnemann Erik , Vodopyanov Konstantin L. , Vasu Subith S.
Published: August 2021

Simultaneous time-histories during the pyrolysis of propane were achieved behind a reflected shockwave using a mid-infrared frequency comb. Data was collected at temperatures ranging from 1105 – 1304 K and pressures of about 4 – 5 atm.
Confocal Visible/NIR Photoacoustic Microscopy of Early-stage Tumor with Structural, Functional and Nanoprobe Contrasts
Authors: Chen Jiangbo , Zhang Yachao , Li Xiaozhen , Zhu Jingyi , Li Dengfeng , Li Shengliang , Lee Chun-Sing , Wang Lidai
Published: August 2021

We report fiber-based confocal visible/near-infrared optical-resolution photoacoustic microscopy that can image tumor microvasculature, oxygen saturation, and nanoprobes in a single scanning. It offers a new tool for early detection of tumors with multiple contrast modes.
Megapixel per second hardware efficient LiDAR based on microcombs
Authors: Lukashchuk Anton , Riemensberger Johann , Karpov Maxim , Liu Junqiu , Kippenberg Tobias J.
Published: August 2021

We show a novel architecture for massively parallel FMCW LiDAR based on multiheterodyne mixing of two triangular chirped soliton microcombs generated in integrated Si3N4 microresonators using a single laser source and a single coherent receiver. We demonstrate a proof of concept experiment with 5.6 MPix/s acquisition rates.
A Pulsed-Coherent Lidar System with a Chip Based Optical Frequency Comb
Authors: Chen Li-Yang , Vinod Abhinav Kumar , McMillan James F. , Liu Hao , Yang Hangbo , Yang C.-K. Ken , Wong Chee Wei
Published: August 2021

We demonstrate a pulsed-coherent lidar system with a microresonator generated optical frequency comb which achieves sub-10μm precision and 30-μm INLMax with a 5-MSa/s sampling rate.
Hybrid Machine Vision Systems Achieve High-speed Video Rates with Object and Scene Tracking
Authors: Rodriguez Frank , Muminov Baurzhan , Vuong Luat T.
Published: August 2021

Hybrid vision systems may enable real-time image processing in remote, power/energy-limited applications. We demonstrate 40k/17k frame-per-second self-motion inference rates with optical processing, which is 3 orders of magnitude faster than current all-electronic state-of-the-art.
Precise and fast autofocus measuring device for high-resolution high-speed pupillometry
Authors: Hesker Mario , Fu Cailing , Heinrichs Matthias , Stollenwerk Jochen , Loosen Peter
Published: August 2021

We present a light-intense optical device for high-speed measurement of pupil size at 1000 fp/s with automatic focusing by software edge contrast measurement and focus tracking using a liquid lens within one second.
Graded-index fiber on-chip absorption spectroscopy
Authors: Riesen Nicolas , Gill Kamalpreet , Priest Craig , Phillips Nicholas , Guan Bin , Lancaster David G.
Published: August 2021

Absorption spectroscopy is demonstrated with microfluidic devices using collimating graded-index fibers. The optofluidics setup allows for absorption measurements to be performed with 10x smaller volumes than for standard cuvettes but with comparable sensitivity.
Demonstration of Novel Silicon Optical Switching on Digital Radio over Fibre Link for Next-Generation Fronthaul
Authors: Xia Junfei , Li Tongyun , Cheng Qixiang , Wonfor Adrian , Bergman Keren , Penty Richard
Published: August 2021

We for the first time propose a silicon photonic switching architecture for digital radio-over-fibre fronthaul links. An RF input power dynamic range of 55dB is demonstrated for 8% EVM with system receiver sensitivity of -23.9dBm.
Tapered Optical Fibers for Fluorescence Lifetime Photometry
Authors: Bianco Marco , Balena Antonio , Pisanello Marco , Pisano Filippo , Sileo Leonardo , Spagnolo Barbara , Montinaro Cinzia , Sabatini Bernardo L. , De Vittorio Massimo , Pisanello Ferruccio
Published: August 2021

We describe a system exploiting a multi-anode array placed in the far-field plane of a tapered optical fiber to perform fluorescence lifetime photometry with depth-resolution in brain tissue.
Phase sensitive two-photon microscopy
Authors: Soni Niraj Kumar , Ul Alam Sabir , Zhou Renjie , Wong Kenneth K. Y.
Published: August 2021

Phase sensitive two-photon microscopy is demonstrated using
transport-of-intensity equation-based phase retrieval algorithm.
Amplitude and phase information of the complex field of two-photon
microscopy signal has been retrieved for fluorescence bead and
presented.
Spectrally encoded quantitative phase imaging microscopy using 2-μm fiber laser
Authors: Soni Niraj Kumar , Ul Alam Sabir , Shi Jiawei , Wong Kenneth K. Y.
Published: August 2021

Spectrally encoded quantitative phase imaging microscopy is demonstrated using 2-μπ wavelength fiber laser source. Experimental setup and preliminary results of amplitude and phase information of the complex field of the sample are presented here.
Efficiency of THz spintronic emitters: from spin-Hall effect in 3d metals to surfaces states in topological insulators
Authors: Rongione Enzo , Baringthon Laëtitia , Hawacker Jacques , Dang Thi Huong , Lefèvre Patrick , Reyren Nicolas , Lebrun Romain , George Jean-Marie , Dhillon Sukhdeep , Jaffrès Henri
Published: August 2021

THz spintronics emitters represent today novel sources for broadband emission using nanometer-scaled materials. We present and model the THz spintronic emission based on the spin Hall effect in 3d metals and on the inverse Rashba-Edelstein effect in the optimized topological insulator Bi1
-x
Sbx.
Versatile Manipulation of Viruses in All-Dielectric Optofluidic Nanocavity Arrays
Authors: Shi Yuzhi , Li Zhenyu , Tsai Din Ping , Kivshar Yuri , Liu Ai Qun
Published: August 2021

We develop a nano-optofluidic chip with an all-dielectric nanocavity array for versatile manipulation of single or massive adenoviruses. Viruses can be transported, sorted, and concentrated using the trapping mode where light is trapped inside nanoholes.
UV laser-induced spatially selective deep oxidation of GaAs
Authors: Salimon I. A. , Averchenko A. , Lagoudakis P. G. , Mailis S.
Published: August 2021

UV laser-induced surface oxidization and spontaneous periodic surface patterning of monocrystalline GaAs wafers is presented here. Irradiation of the semiconductor's (100) surface with UV laser radiation (244 nm) in ambient conditions results in the formation of regular periodic surface structures, known as laser-induced periodic surface structures (LIPSS). At the higher end of the irradiation intensities used in our experiments the periodic oxide features merge to form a continuous porous oxide layer with a thickness of ~0.4 um.
Air-Dispersion-Corrected Dual-Comb Distance Metrology
Authors: Mitchell Toby , Marin Pablo Castro , Sun Jinghua , Reid Derryck T.
Published: August 2021

A dual-comb optical-path-difference measurement provides the group velocity of air with a fractional uncertainty of 10-5, allowing the geometrical path difference to be determined without auxiliary information such as the dispersion equation for air.
Gating Artefact in the Coupled-Wave-Equations Modeling of Classical and Quantum Kerr Nonlinear Effects
Authors: Hansson Tobias , Matsko Andrey B. , Taheri Hossein
Published: August 2021

We show that the coupled-wave-equations numerical modeling of frequency combs, considered equivalent to the split-step integration of the nonlinear Schrödinger equation family, entails an inherent gating artefact capable of disguising physically unstable states as stable.
Self-written polymer waveguide interconnects as low-loss and simple sensing devices
Authors: Günther Axel , Zheng Lei , Baran Murat , Garg Roopanchu , Roth Bernhard , Kowalsky Wolfgang
Published: August 2021

Self-written waveguides are an established solution to connect different optical elements with each other. They minimize coupling losses and enable a rigid connection. Furthermore, their characteristics enable a usage as thermal sensing element simultaniously.
Visible-wavelength Entangled Photon Source for Quantum Communication and Quantum Imaging
Authors: Perna Adrià Sansa , Gräfe Markus , Steinlechner Fabian
Published: August 2021

We present a polarization entangled photon pair source in the visible light range (532 nm) bright enough for exploitation in quantum communication and sensing. Its suitability for low cost and low jitter detection is studied.
Resource-efficient real-time polarization compensation for MDI-QKD with rejected data
Authors: Bedroya Olinka , Li Chenyang , Qian Li , Lo Hoi-Kwong
Published: August 2021

We propose and implement a novel polarization compensation in MDI-QKD systems using discarded bits, without reducing key-sharing cycle or demanding additional resources. Polarization drift is maintained below 0.15 rad over 40 km of fibre.
Nano-engineered spatial-light modulators from electro-optic nano-molecules
Authors: Benea-Chelmus Ileana-Cristina , Meretska Maryna L. , Elder Delwin L. , Tamagnone Michele , Dalton Larry R. , Capasso Federico
Published: August 2021

We explore transduction between the radio-frequency and near-infrared domain in nanoscale metasurfaces to demonstrate multi-pixel spatial light modulators. We custom-tailor their optical, radio-frequency and electro-optic response at the nanoscale. We investigate guided mode resonances and bound states in the continuum cross-functionalized with state-of the art organic nano-molecules JRD1 that have combined merits of record efficiency in a broadband range and low electronic consumption per pixel.
Polarization Dependence of Laser Induced inner-shell excitations
Authors: Deng Yunpei , Zeng Zhinan , Komm Pavel , Zheng Yinghui , Helml Wolfram , Xie Xinhua , Filus Zoltan , Dumergue Mathieu , Flender Roland , Kurucz Máté , Haizer Ludovit , Kiss Balint , Kahaly Subhendu , Li Ruxin , Marcus Gilad
Published: August 2021

Laser induced x-ray fluorescence were observed against laser polarization ellipticity. While emission from krypton peaks at linear polarization, a signature of recollision, emission from neon shows opposite trend. We attribute it to two competing processes.
Extraction of Coupling Coefficient for Coherent 2×1 VCSEL Array
Authors: Jahan Nusrat , North William , Strzebonski Pawel Jakub , Lakomy Katherine A. , Choquette Kent D.
Published: August 2021

The coupling coefficient of a 2×1 optically coherent microcavity laser array can be experimentally determined. We show the extracted coupling coefficient varies for arrays depending on in-phase or out-of-phase coherent operation, in agreement with theory.
Dyakonov Surface Waves in Twisted Confined Media
Authors: Chermoshentsev D. A. , Anikin E. V. , Dyakov S. A. , Gippius N. A.
Published: August 2021

We theoretically predict the existence of Dyakonov-like surface waveguide modes in the planar interfacial waveguide between two uniaxial dielectrics and Dyakonov surface cavity modes in the interface of two anisotropic dielectrics with rectangular cross-sections.
Experimental Investigation of Tunable Acousto-Optic Frequency Combs
Authors: Voloshin A.S. , Mantsevich S.N.
Published: August 2021

We demonstrate novel approach for generation of optical combs in frequency shifting loop based on acousto-optic interaction. This approach provides comb multiplication with different line spacing and generation of dual-comb for spectroscopy applications.
Transmission Switching of Coupled Whispering Gallery Mode Resonators on Flexible Substrates
Authors: Woska Simon , Rietz Pascal , Karayel Osman , Kalt Heinz
Published: August 2021

Pairs of optical Whispering Gallery Mode resonators were structured onto flexible elastomer substrates. Exploiting the substrates temperature-induced contraction, tunable coupling of the two cavities was realized and variable transmission was demonstrated via 2-fiber transmission spectroscopy.
Ultra-Sensitive, Real-Time Detection of HCl Using a Transportable NICE-OHMS System
Authors: Curtis E. Anne , Black Nicola C. G. , Walsh Gregory S. , Lucas Chris G. , Barwood Geoffrey P.
Published: August 2021

We report the development of a portable NICE-OHMS device with the aim of ultra-sensitive (<1 nmol/mol), real-time (<1 min) detection of HCl and monitoring of water vapor for applications in microelectronic fabrication cleanrooms.
On-Chip Interferometric Random Spectrometer (IRS)
Authors: Edrei Eitan , Gerstel Elam , Letova Shani Gamzu , Levy Uriel
Published: August 2021

We introduce an on-chip device combining a random spectrometer with an interferometric scheme to enable higher spectral resolution measurements by more than one order of magnitude as compared to similar platforms.
Hollow-Core Fiber Particle Tracking for Nanoparticle Size Distribution and Mixture Analysis
Authors: Nissen Mona , Förster Ronny , Lorenz Adrian , Schmidt Markus A.
Published: August 2021

High-resolution sizing of nanoparticle ensembles is presented by employing a single antiresonant element fiber as optofluidic platform for nano-object tracking. Key are long trajectories enabled by quasi-single-mode light guidance, low image background and fluidic confinement.
Binary phase pupil mask and principal component analysis image fusion tailored for extended depth-of-field imaging
Authors: Milgrom Benny , Avrahamy Roy , David Tal
Published: August 2021

Extended depth-of-field of white light illumination imaging is theoretically and experimentally demonstrated. Pupil phase mask tailoring focal chromatic dispersion is hybridized with principal component analysis fusing individual RGB images to a sharp grayscale image over extended depth-of-field.
Analytic theory for parametric gain in lossy integrated waveguides
Authors: Karlsson Magnus , Schröder Jochen , Zhao Ping , Andrekson Peter A.
Published: August 2021

We provide an accurate yet simple analytic formula for the parametric gain in phase (in-) sensitive parametric amplifiers where the waveguide loss cannot be neglected. This is of significance for integrated parametric devices.
Compact High Power OPCPA System for 2-photon and 3- photon In-Vivo Brain Imaging
Authors: Schulz Michael , Golz Torsten , Grguras Ivanka , Braatz Thomas , Zapolnova Ekaterina , Buss Jan-Heye , Riedel Robert
Published: August 2021

A compact high power OPCPA system with ultrashort pulses at wavelengths ranging from 850 to 1700 nm with single or multiple output channels is presented for 2- and 3-photon in- vivo brain imaging.
Towards Satellite-Suited Noise-Free Quantum Memories
Authors: Rodríguez Luisa Esguerra , Meßner Leon , Robertson Elizabeth , Gündoğan Mustafa , Wolters Janik
Published: August 2021

Quantum memories on satellites will allow to circumvent transmission losses in long-distance quantum communication. We demonstrate a warm Caesium vapour memory based on EIT with an unconditional noise floor of 1.2 · 10-3 due to collision-induced fluorescence.
Ultrafast Charge Transfer and π-Plasmon Dynamics in Single-Walled Carbon Nanotubes
Authors: Singh Arvind , Kumar Sunil
Published: August 2021

Excited-state charge transfer, excitons, and π-plasmons dynamics in bi-chiral SWNTs sample has been studied. Only, the π-plasmon dynamics is affected by the sample temperature, while, all the dynamical processes remain photocarrier density-independent.
Bound-to-continuum Non-perturbative Regime for an Ultrastong Light-matter Coupling
Authors: Rajabali Shima , Cortese Erika , Beck Mattias , De Liberato Simone , Faist Jérôme , Scalari Giacomo
Published: August 2021

In this work, we theoretically and experimentally show that the confinement of an electromagnetic field below critical length-scales can excite high momentum matter resonances and can ultimately limit the light-matter coupling enhancement in an ultrastrong coupling regime.
Third harmonic generation from thin gradient ternary mixture layers
Authors: Zuber David , Kleinert Sven , Tajalli Ayhan , Steinecke Morten , Jupé Marco , Jensen Lars , Ristau Detlev , Morgner Uwe
Published: August 2021

By analyzing the third harmonic generation from gradient layers of the amor- phous dielectric ternary mixture material HfxAlyOz we are able to derive the third order nonlinear susceptibility of the material.
Tailoring optical properties of conductive/dielectric layers and their periodic stacks using DoE method
Authors: Mroczyński R. , Kosińska D.
Published: August 2021

This study presents the results of the optimization of the optical properties of TiN and TiOx thin films by employing Taguchi orthogonal tables approach. The presented results demonstrated the possibility to tune the optical properties of investigated conductive/dielectric films in the UV-Vis range by the appropriate setting of sputtering parameters. The presented findings are the basis for the fabrication of periodic stacks for the application in the technology of metamaterials.
Ultra-compact 266-289 nm pair source for DIAL LIDAR based on hollow-core photonic crystal fiber
Authors: Chafer M. , Osório J.H. , Dhaybi A. , Ravetta F. , Amrani F. , Debord B. , Cailteau-Fischbach C. , Gérôme F. , Ancellet G. , Benabid F.
Published: August 2021

We propose an ultra-compact double wavelength source 266-289 nm developed for DIAL LIDAR of Ozone in the troposphere thanks to a hollow-core photonic crystal fiber filled in with Deuterium.
InP Phased Array for Beam Transforming Applications
Authors: Patsamanis G. , Ketzaki D. , Alexoudi T. , Roumpos I. , Chrysostomidis T. , Totović A. , Chatzitheocharis D. , Vyrsokinos K.
Published: August 2021

We demonstrate an integrated InP-based phased array relying on a 1×5 splitting structure for beam transformation in WFEs. The electromagnetically calculated beam in the far-field at 1550nm presents perfect agreement with the one experimentally measured.
Ultrafast Magnetic Field-Dependent Dynamics in the High-Temperature Superconductor La2−xSrxCuO4
Authors: Burch Ashlyn D. , Paudel Binod , Kang Kyeong Tae , Lee Min-Cheol , Chen Aiping , Zhu Jian-Xin , Prasankumar Rohit P. , Hilton David J.
Published: August 2021

We performed optical-pump, terahertz-probe measurements on optimally doped La2
−

x
Sr
x
CuO4 under an applied magnetic field. T his r eveals t he s trong interplay between magnetic and optical Cooper pair breaking that governs quasiparticle recovery dynamics in superconducting cuprates.
Machine learning assisted quantum super-resolution microscopy
Authors: Kudyshev Zhaxylyk A. , Sychev Demid , Martin Zachariah , Bogdanov Simeon , Xu Xiaohui , Kildishev Alexander V. , Boltasseva Alexandra , Shalaev Vladimir M.
Published: August 2021

A machine learning assisted framework significantly speeds up image acquisition in super-resolution microscopy based on photon antibunching. The technique is compatible with a CW excitation regime and applicable to a wide range of quantum emitters.
Photonic Systems Engineering: A Structured Approach to Positioning, Navigation and Timing using Microresonators
Authors: Li Ying Lia
Published: August 2021

Optical microresonator gyroscopes, accelerometers and frequency combs are ideally suited for positioning, navigation and timing (PNT) applications. Using the example of a microresonator accelerometer, I present a systems engineering approach to PNT commercialisation.
Earth-rotaton-rate Sensitivity
Authors: Vahala Kerry , Lai Yu-Hung , Suh Myoung-Gyun , Shen Boqiang
Published: August 2021

The physical principles of a chip-based Brillouin laser gyroscope are reviewed. The device can resolve sinusoidal rotations with amplitude as low as 5 degrees/hour and is also used to detect the Earth’s rotation.
Integrated optomechanical sensing for semiconductor metrology
Authors: Fiore A. , Galeotti F. , Liu T. , Petruzzella M. , Vollenbroek I. Seršić , Lindgren G.G. , Pagliano F. , van Otten F.W.M. , van Veldhoven P.J. , Pogoretskiy V. , Jiao Y. , Mohtashami A. , Sadeghian H. , van der Heijden R.W.
Published: August 2021

In this talk we will present recent process on the integration of nano-opto-electro-mechanical sensors with photonic circuits and optical read-out, showing a route towards fully-integrated optical sensing.
Boosting Fluorescence-Based Chiral Sensing with Nanophotonics
Authors: Mohammadi Ershad , Raziman T.V. , Curto Alberto G.
Published: August 2021

The handedness of chiral molecules can be detected in their circularly polarized fluorescence, which is typically very weak. Here, we propose dielectric nanophotonics to increase both the fluorescence intensity and polarization contrast.
Integrated Nonvolatile Phase-shifter Based on Electrically Reconfigurable Low-loss Phase-change Materials
Authors: Ríos Carlos , Du Qingyang , Zhang Yifei , Shalaginov Mikhail , Miller Paul , Robinson Paul , Roberts Christopher , Kang Myungkoo , Richardson Kathleen A. , Gu Tian , Vitale Steven , Hu Juejun
Published: August 2021

We demonstrate a nonvolatile, small-form-factor (20 m) phase-shifter based on low-loss phase-change materials (Ge2Sb2Se4Te1 and Sb2Se3) on SOI waveguides. We achieve continuous optical phase modulation and an MZI switch with 30 dB extinction ratio.
Phase-Change Material Micro-Displays
Authors: Hemmatyar Omid , Abdollahramezani Sajjad , Brown Tyler , Adibi Ali
Published: August 2021

Here, we leverage Mie scattering resonances supported by an all-dielectric metasurface made of phase-change material GeSe3 nanopillars to demonstrate nanoscale high-saturation color switching.
Purcell-Enhanced UV Sources
Authors: Shultzman Avner , Segal Ohad , Kurman Yaniv , Kaminer Ido
Published: August 2021

UV lamps are of increasing importance for safe virus disinfection. Here we propose a novel concept for UV sources based on a stack of phosphor-nanolayers, designed to maximize the output emission through photonic local-density-of-states engineering.
Collimation Effect in Strongly Modulated Anisotropic Photonic Crystals with Near-Zero Refractive Indices
Authors: Jamilan Saeid , Semouchkina Elena
Published: August 2021

A strongly modulated photonic crystal with rectangular lattice was designed to realize the collimation effect for diverging waves entering the crystal at frequencies, providing near-zero refractive indices at unidirectional transmission.
Robustness of Dual-Pump-Induced Ultrahigh Repetition Rate Pulse Trains Against Input Power Fluctuations
Authors: Antikainen Aku , Agrawal Govind P.
Published: August 2021

We demonstrate numerically that the temporal and spectral coherence of a pulse train generated through dual-color pumping a fiber can be maintained even in the presence of pump power fluctuations on the order of 5%.
Embedded eigenstate in a single resonator for sensing
Authors: Jacobsen Rasmus E. , Krasnok Alex , Arslanagić Samel , Lavrinenko Andrei V. , Alú Andrea
Published: August 2021

Embedded eigenstates have been shown in periodic arrays or in structures with extreme material properties. Here, we experimentally demonstrate a compact embedded eigenstate supported by suitable boundary conditions, enabling advanced sensing applications.
Dynamically Controlled Spatio-temporal Filamentation of Orbital Angular Momentum Light in Water
Authors: Miller J. Keith , Free Justin , Dai Kunjian , Tsvetkov Dmitrii , Terekhov Pavel , Litchinitser Natalia M. , Johnson Eric G.
Published: August 2021

We demonstrate a new route for a systematic, dynamical, high-speed, spatio-temporal control of femtosecond light filamentation in water and, more generally, other maritime environments that can be precisely controlled on a pulse by pulse basis.
Artificial Intelligence Assisted Optimization and Prediction of Absorption of Metasurfaces for Hot-Electron Generation
Authors: Sarma Raktim , Goldflam Michael , Donahue Emily , Pribisova Abigail , Gennaro Sylvain , Wright Jeremy , Brener Igal , Briscoe Jayson
Published: August 2021

We use artificial intelligence techniques such as the genetic algorithm and convolutional neural networks for optimization and prediction of absorption spectra of plasmonic metasurfaces for enhancing hot-electron generation. The predictions of our algorithms agree well to experimental results.
Imaging of Minority Charge Carrier Lifetimes of Semiconductors using Digital Light Processing and Compressed Sensing
Authors: Baltušis Aidas , Koutsourakis George , Wood Sebastian , Sweeney Stephen J.
Published: August 2021

We propose and investigate a novel, rapid method for contactless spatial imaging of minority charge carrier lifetimes based on compressed sensing. The proposed method demonstrates an order of magnitude potential increase in imaging speeds.
Fiber-Based Dual-Color Infrared Pulse Source with Tunable 12-60 THz Frequency Separation
Authors: Antikainen Aku , Ramachandran Siddharth
Published: August 2021

We provide a numerical proof-of-concept demonstration of a widely tunable all-fiber dual-color pulse source in the infrared. The pulse source is based on intermodal Raman scattering and soliton trapping in a dispersion compensating fiber.
Optimization of the light coupling between metalens and photonic crystal resonators for robust on-chip microsystems
Authors: Xiao Yahui , Wang Zi , Wang Feifan , Lee Hwaseob , Kananen Thomas , Gu Tingyi
Published: August 2021

We designed an on-chip transformative optics microsystem with integrated metalens for robust and highly efficient light coupling into a photonic crystal cavity.
Anomalous dispersioninbluewavelengthrange in verticallycoupledIII-nitridewaveguides
Authors: Das Pallabi , Saha Kasturi , Tallur Siddharth
Published: August 2021

In this paper, we present dispersion engineering in vertically coupled III- nitride (GaN/AlN/GaN) waveguides for short (blue) wavelengths. Peak anomalous dispersion ≈1.83 × 105 ps/nm − km is achieved by tuning the geometric parameters and thereby coupling strength of the waveguides.
Photonics in Extreme Environments: High Energy Radiation-Induced Optical Response in Silicon Waveguides
Authors: Ryder Landen D. , Reed Robert A. , Weiss Sharon M.
Published: August 2021

The radiation-induced optical response of a silicon waveguide is investigated and important implications for experimental testing techniques are reported. A computationally efficient approach to accurately estimate the radiation-induced response using perturbation theory is also reported.
On-Chip Si3N4 Spatial Heterodyne Fourier Transform Spectrometer for the Optical Window in Biological Tissue
Authors: Yoo Kyoung Min , Chen Ray T.
Published: August 2021

We designed and demonstrated an on-chip Fourier transform spectrometer on Si3N4-on-SiO2 using an array of Mach-Zehnder interferometers (MZIs) for = 600~1000 nm. The retrieval of an input spectrum is demonstrated by the interconnect simulation.
Dynamic Entanglement and Photon Antibunching using Near-Field-Excited Quantum Emitters
Authors: Bello Frank , Kongsuwan Nuttawut , Keating Geoffrey , Donegan John F. , Hess Ortwin
Published: August 2021

We numerically demonstrate strongly-driven, dynamic entanglement of quantum emitters using time-varying, sub-diffracted light from a near-field transducer. Using cavity-free environments, a controlled-NOT quantum logic operation is performed and ultrafast, single-photon emission is demonstrated.
Wavelength-Division Multiplexed Optical Cryptocurrency
Authors: Pai Sunil , Abebe Nathnael , Dubrovsky Michael , Hwang Rebecca L , Karpov Maxim , Penkovsky Bogdan , Miller David A. B. , Solgaard Olav
Published: August 2021

We propose an optical proof-of-work scheme that feeds data encoded into wavelength-division multiplexed modes through a programmable photonic network. We verify robustness by modeling network dispersion, allowing for energy-efficient optical al- ternatives to current cryptocurrency security schemes.
Wide Optical and RF Bandwidth Thin Film Lithium Niobate Modulator on Silicon
Authors: Chakravarty Swapnajit , Safian Reza , Zhuang Leimeng
Published: August 2021

We propose a bonding interface fabrication tolerant silicon nitride capped thin film lithium niobate on silicon modulator that operates with RF bandwidths >200 GHz in C- and O-bands and VπL 4V-cm and 3V-cm respectively.
Coupled Multicore fibers for Dual-point Refractive Index Measurements
Authors: Cuando-Espitia Natanael , Fuentes-Fuentes Miguel A. , May-Arrioja Daniel A. , Hernández-Romano Iván , Martínez-Manuel Rodolfo , Torres-Cisneros Miguel
Published: August 2021

Simultaneous measurement of refractive index (RI) in liquids is demonstrating by using multicore fibers to spectrally encode the intensity changes observed when the fiber tip is immersed in the tested liquid.
Receiver IQ Imbalance and Skew Compensation By Frequency Domain 4x2MIMO Equalizer
Authors: Liang Junpeng , Wang Weiming
Published: August 2021

We propose a frequency domain 4x2 multi-input and multi-output (MIMO) equalizer for long-haul transmission systems, which can compensate receiver IQ imbalance and Skew with lower computational complexity than time domain 4x2 MIMO.
THz generation in organic crystal BNA at MHz repetition rates
Authors: Mansourzadeh S. , Vogel T. , Shalaby M. , Wulf F. , Saraceno C. J.
Published: August 2021

We investigate average power scaling at MHz repetition rate and thermal behavior of THz generation in the organic crystal BNA for the first time, reaching an average power of 380 µW at 10% duty cycle.
Analysis of a VLC Link under Lighting Conditions in an Indoor Scenario
Authors: Guillén David Esteban Farfán , Tosta Fernando César Baraviera , de Tarso Neves Paulo , de Almeida Prado Pohl Alexandre
Published: August 2021

Visible light communication transmits data through light-emitting diodes. In this work a commercial lamp consisting of 7 white LEDs is employed in the demonstration of data transmission, obeying the recommended lighting requirement for an indoor scenario.
Velocity random walk and dynamic range of laser-driven precision optomechanical inertial accelerometers
Authors: Flores Jaime Gonzalo Flor , Huang Yongjun , Yerebakan Talha , Wang Wenting , Wu Jiagui , Wong Chee Wei
Published: August 2021

Here we present a full study and characterization of our fabricated precision optomechanical accelerometer with an 8.2 µg/Hz1/2 VRW and 50.9 µg/Hz bias stability, with innovative RF readout, suitable for inertial applications.
Triangular Silicon Carbide Nanophotonic Devices for Quantum Simulators
Authors: Majety Sridhar , Norman Victoria A. , Li Liang , Bell Miranda , Saha Pranta , Radulaski Marina
Published: August 2021

We explore applications of silicon carbide photonics in quantum simulation. We design a low-loss triangular photonic crystal molecule with embedded color centers, and explore the formation of hybridized light-matter states in this system.
Filamentation-free Self-compression of LWIR Pulses in a CO2 Gas-filled Multi-pass Cell: A Numerical Study
Authors: Hastings Michael G. , Panagiotopoulos Paris , Hasson Victor , Kolesik Miroslav , Moloney Jerome V.
Published: August 2021

Pulse self-compression is demonstrated numerically for 10.3 µm pulses in a gas-filled multi-pass cell. The cell is filled with the 13CO2 isotope, which exhibits a shifted absorption spectrum from the 12CO2 laser gain medium.
Ghost Imaging Counterfactually
Authors: Hance Jonte R. , Rarity John
Published: August 2021

We have developed a protocol for ghost imaging that is always counterfactual - while imaging an object, no light interacts with it. This provides both better visibility/SNR and less absorbed intensity than ghost imaging.
Spectral Mode Analysis of Non-Hermitian Phased Microcavity Laser Array
Authors: North William , Jahan Nusrat , Strzebonski Pawel , Choquette Kent D.
Published: August 2021

A coupled 2x1 microcavity laser array is experimentally investigated. We show that the spectral mode profile can identify the coherent region and is consistent with the coupled power enhancement.
Ultrafast Mode-Locked Fiber Laser Employing New Scheme of Cr-Doped Fiber and Reduced Graphene Oxide
Authors: Liu Chia-Ming , Liu Chun-Nien , Su Heng-Yi , Hsiao Vincent K.S. , Chen Nan-Kuang , Yeh Chao-Yung , Huang Sheng-Lung , Cheng Wood-Hi
Published: August 2021

The 1400-nm ultrafast mode-locked Cr-doped fiber lasers (MLCDFLs) employing new scheme of single-mode chromium-doped fiber (SMCDF) as optical gain and reduced graphene-oxide (RGO) as saturable absorber is demonstrated for the first time. The output pulse width, average output power, and repetition rate were 118-fs, 2.95-mW, and 15.9-MHz, respectively.
On-chip reconfigurable inverse-designed nanophotonic devices based on phase-change materials
Authors: Yang Sikang , Luan Jing , Liu Deming , Zhang Minming
Published: August 2021

We propose an on-chip reconfigurable nanophotonic device platform to dynamically implement inverse-designed devices with different functions by programming the state of the phase-change materials, four power splitters and one wavelength multiplexer are demonstrated.
Highly sensitive compact optical magnetometer on the basis of an atomic clock
Authors: Andryushkov V. , Radnatarov D. , Kobtsev S.
Published: August 2021

We demonstrate the possibility of a compact optical magnetometer reaching sensitivities down to 270 pT/Hz1/2 within a 10-Hz bandwidth. It is further shown how to design such a device on the basis of a standard atomic clock.
Surface-Enhanced Raman Spectroscopy for Detection of Threat Chemicals with Portable Raman Spectrometers
Authors: Emmons Erik D. , Tripathi Ashish , Guicheteau Jason A.
Published: August 2021

We are demonstrating surface-enhanced Raman spectroscopy using compact Raman spectrometers for field detection of trace-level threat materials. The goal is to improve limits-of- detection for realistic threat materials.
Single-shot broadband white light imaging through scattering layers via speckle cross-correlations
Authors: Li Wei , Liu Jietao , Liang Wenhai , Liu Lixian , Wang Bingjian , Shao Xiaopeng
Published: August 2021

A method for imaging through scattering media under a 300nm-bandwidth white-light illumination from a single-shot speckle is demonstrated. This approach, involving a cross-correlation operation, is free from ambiguities and is robust to noise.
Generation of a Nearly-Monocycle Optical Pulse in the Near-Infrared and Its Application to Mass Spectrometry
Authors: Nakano Yuta , Imasaka Tomoko , Imasaka Totaro
Published: August 2021

We report on the generation of an octave-spanning (600-1400 nm) nearly-monocycle (1.1 cycle) ultrashort optical pulse (3.2 fs) in the near-infrared region by the Fourier synthesis of two spectrally-broadened pulses at 800 and 1200 nm.
Focusing and Accelerating Light with the Same Flat Lens
Authors: Talukdar Tahmid H. , Ryckman Judson D.
Published: August 2021

We demonstrate how a simple 1D flat lens can be utilized to not only focus light but to generate non-paraxial accelerating beams. We further report how illumination angle and wavelength degrees of freedom allow dynamic transition between these two functionalities.
Preventing the breakdown of photoconductive terahertz emitter at high bias-field operation
Authors: Welsch Malte , Singh Abhishek , Winnerl Stephan , Pashkin Alexej , Xu Ming , Li Mengxia , Helm Manfred , Schneider Harald
Published: August 2021

The efficiency of photoconductive terahertz emitters is improved by increasing the operating bias field and preventing the breakdown. We can apply ~ 120 kV/cm bias field by using external resistances in series to the emitter.
QCSE and Carrier Blocking in P-modulation Doped InAs/InGaAs Quantum Dots
Authors: Mahoney Joe , Smowton Peter M , Maglio Benjamin , Jarvis Lydia , Allford Craig , Shutts Samuel , Tang Mingchu , Liu Huiyun , Abadía Nicolás
Published: August 2021

The quantum confined Stark effect in InAs/InGaAs QDs using an undoped and p-modulation doped active region was investigated. Doping potentially offers more than a 3x increase in figure of merit modulator performance up to 100 °C.
Panda-type Few-mode Fiber Enabled Microwave Photonic Filter with Reconfigurable Finite Impulse Response
Authors: Zhang Yao , Gao Jitao , Fu Songnian , Wang Yuncai , Qin Yuwen
Published: August 2021

We demonstrate multiple-dimensional division multiplexing enabled microwave photonic filter with the help of Panda-type few-mode fiber. By utilizing the delay between two orthogonal polarizations, the number of taps in finite impulse response can be doubled.
Recognition of OAM state using CNN based deep learning for OAM shift keying FSO system with pointing error and limited receiving aperture
Authors: Gong Biao , Cai Shanyong , Xiao Ziyang , Wang Xin , Li Luming , Zhang Zhiguo
Published: August 2021

In this paper, we study the performance of OAM shift keying FSO system with pointing error and limited receiving aperture using CNN based demodulator. The results show that the recognition accuracy can reach 98% with pointing error and weak turbulence.
Fiber-optic displacement sensor with 4 nm resolution (~ λ/400) at 1550 nm using off-axis interferometer
Authors: Tian Zhen , Chen Nan-Kuang , Shum Perry Ping , Suo Lina , Yao Yicun , Zhang Liqiang , Grattan Kenneth T. V. , Azizur Rahman B. M. , Kashyap Raman
Published: August 2021

A fiber-optic displacement sensor with ~λ/400 spatial resolution, at an operating wavelength of ~1550 nm, using an off-axis fiber interferometer and achieving the best displacement resolution of 4-nm in the optical domain has been demonstrated.
Investigation of multi-layer-wall hollow-core negative curvature fiber
Authors: Yan Shibo , Lou Shuqin , Zhao Guozhong , Guo Jiaoyan , Yang Shuai , Sheng Xinzhi
Published: August 2021

We investigate the characteristics of NCFs with multi-layer-wall, and explain the change of equivalent wall-thickness with different other-material-region thicknesses and indices. We also measure the THz NCFs in a THz-TDS system for verification.