bluuebunny/crossref_metadata_2025 huggingface dataset:
Vascular Injury in Lung Vessels Post-radiation: A Dose and Time Response Case Study
Authors: Mostaghimi Soudeh , Mehrvar Shima , Foomani Farnaz , Narayanan Jayashree , Camara Amadou K.S. , Fish Brian , Medhora Meetha , Ranji Mahsa
Published: August 2021

3D vasculature of non-irradiated and irradiated lungs was extracted, 60 and 90 days after radiation using optical Cryo-imaging. Quantitative measurements show that the number of terminal points and vessel diameter, volume, and terminal points decreases.
Highly-sensitive infrared photon counting by nondegenerate two-photon absorption under mid-infrared pumping
Authors: Fang Jianan , Wang Yinqi , Yan Ming , Wu E. , Huang Kun , Zeng Heping
Published: August 2021

Infrared photon detection was realized based on nondegenerate two-photon absorption in silicon, where the mid-infrared pumping scheme significantly enhanced the sensitivity by eliminating background noises due to the harmonic excitation.
Ultrasmall O-band CWDM 4λ MUX based on Mosaic Structure for Dense Optical Interconnects
Authors: Nakamura Kodai , Fujisawa Takeshi , Sawada Yusuke , Sato Takanori , Saitoh Kunimasa
Published: August 2021

An ultrasmall 4λ wavelength multiplexer based on cascaded mosaic structure is proposed for dense optical interconnects for the first time. Direct-binary-search design shows the size can be drastically reduced, and is 1/20 of conventional one.
High quality factor chalcogenide microresonators with low parametric oscillation threshold
Authors: Zeng Pingyang , Wu Jiayue , Xia Di , Yang Zelin , Sun Yaodong , Huang Yufei , Zhao Jiaxing , Cheng Huanjie , Zhang Bin , Li Zhaohui
Published: August 2021

We demonstrated high-quality-factor (Q) chalcogenide (Ge-Sb-S) microresonators with intrinsic Q of 1.9×106 through an improved fabrication process, which enables a low optical parametric oscillation (OPO) threshold of 3.5 mW.
Observation of transverse Anderson localization of mid-infrared light in a chalcogenide transversely disordered optical fiber
Authors: Nakatani Asuka , Tuan Tong Hoang , Matsumoto Morio , Sakai Goichi , Suzuki Takenobu , Ohishi Yasutake
Published: August 2021

We experimentally demonstrate transverse Anderson localization of mid-infrared light by using a transversely disordered optical fiber made of chalcogenide glasses.
Erbium-doped LNOI as a Gain Platform for Integrated Optics
Authors: Xiang Junmin , Cai Minglu , Li Tieying , Xiao Zeyu , Wu Kan , Chen Jianping
Published: August 2021

We demonstrate a gain platform based on erbium-doped lithium niobate thin film for integrated waveguide amplifier and laser. Luminescence properties of the film were characterized and gain properties of optical waveguide were calculated.
Multi-Color Method for the Correction of Air Refractive Index based on Dispersive interferometry of Optical Frequency Comb
Authors: Xiong Shilin , Zhang Ruixue , Wang Yue , Zhou Siyu , Wu Guanhao
Published: August 2021

We propose a multi-color method for the self-correction of air refractive index in moist air based on spectral interference of optical frequency comb. The relative correction stability of 4.3×10-7 is achieved.
Fourier Transform Spectral Analysis Based Fiber Nonlinearity-insensitive OSNR Monitor
Authors: Huang Zhuili , Tian Ye , Long Xiaojing , Zhang Chao , Liu Yufei
Published: August 2021

A fiber nonlinearity-insensitive OSNR monitoring technique was developed based on Fourier transform spectral analysis and shallow neural networks for function fitting. The results show monitoring errors are less than ± 0.5dB for 3-channel 25GBaud PDM-QPSK signals.
Broad-range self-sweeping linearly polarized Ho-doped fiber laser
Authors: Vladimirskaya A.D. , Lobach I.A. , Kablukov S.I.
Published: August 2021

We experimentally demonstrate a linearly polarized self-sweeping Ho-doped fiber laser with lasing near 2100 nm. The laser feature is wavelength tuning with range of 10 nm without any spectral filters.
An accurate disturbance source locating method based on machine learning for complex environments
Authors: Liu Yijie , He Tao , Zhang Shixiong , Yan Zhijun , Liu Deming , Sun Qizhen
Published: August 2021

A method for disturbance positioning in noisy environment is introduced. By the partitioning algorithm and a well-trained B-P neural network classifier, an average locating accuracy of 95% was demonstrated in the field test.
Compact, Energy-Efficient, and Low-Loss Thermo-Optic Silicon Optical Phase Shifter
Authors: Qiu Huaqing , Liu Yong , Kong Deming , Luan Chao , Meng Xiansong , Guan Xiaowei , Ding Yunhong , Hu Hao
Published: August 2021

We experimentally demonstrate a compact silicon optical phase shifter based on thermo-optic effect. The loss, power consumption, modulation bandwidth, and footprint are 0.77 dB, 3.1 mW/π, 38 kHz, and 45 × 45 µm2, respectively.
In Situ Measurement of the Cooper Minimum in Argon
Authors: Brown Graham G. , Zhang Chunmei , Ko Dong Hyuk , Corkum Paul B.
Published: August 2021

We simulate a collinear two-color attosecond in situ measurement in argon and show that in situ techniques measure a variation of the electron group delay around the Cooper minimum.
A Low Complexity Diagonalized Kalman Filter for Joint Equalization of Ultra-fast RSOP and Large PMD in Presence of Residual CD
Authors: Zhang Qi , Cui Nan , Zhang Nannan , Li Xue , Hu Leiya , Xi Lixia , Zhang Xiaoguang
Published: August 2021

A low complexity diagonalized Kalman filter is proposed in this paper, which be qualified for joint equalization of RSOP (up to 10Mrad/s) and PMD (DGD=100ps) in presence of residual CD (300ps/nm).
Improvement of GaN Epitaxial Layer and AlGaN/GaN HEMTs by Patterned Sapphire Substrate Technology
Authors: Lee Cheng-Che , Lee Hsin-Jung , Chan Chien-Tsun , Kuan Chieh-Hsiung
Published: August 2021

A microstructure was designed to reduce the dislocations in the epitaxial GaN layer and improve electrical characteristics of HEMTs by using the patterned sapphire substrates technology. AlGaN/GaN HEMTs with the maximum drain current density increased from 308 mA/mm to 469 mA/mm were achieved.
Fabrication of Sub-wavelength Resolved Silver Acrylate Composite Microstructures
Authors: Jaiswal Arun , Singh Gaurav Pratap , Rani Sweta , Saxena Sumit , Shukla Shobha
Published: August 2021

Simultaneous two photon polymerization/reduction of metal-polymer composite resin has been utilized for fabrication of microstructures with silver loadings as high as 20 wt%. Feature Sizes as small as 370 nm are demonstrated.
Novel coupling schemes between the topological cavity and valley modes in a terahertz on-chip waveguide
Authors: Xiong Hao , Lu Yao , Wu Qiang , Xu Xitan , Ma Ruobin , Xu Jingjun
Published: August 2021

We demonstrated novel coupling phenomena between the topological cavity and valley modes in a terahertz on-chip waveguide. This work may provide insights for designs of topological photonic circuits and future applications in terahertz communications.
Controlled light transport and emission using photonic structures with short-range order
Authors: Saini Sudhir Kumar , Nair Rajesh V.
Published: August 2021

We study the resonant frequency gap in the short-range order photonic system. The decay rate measurements are performed for an emitter embedded in these structures to validate the changes in the local density of states.
Uncorrelated photon pair generation in asymmetric heterogeneously coupled waveguides
Authors: Ding Xiangyan , Ma Jing , Tan Liying , Helmy Amr S. , Kang Dongpeng
Published: August 2021

We develop a technique to tailor modal group velocities in asymmetric heterogeneously coupled waveguides such that uncorrelated photon pairs can be generated directly. Design examples based on lithium niobate thin film waveguides are provided.
Angular Spectrum of Bound State in the Continuum for Near and Far Field Analysis
Authors: Vaity Pravin , Achanta Venu Gopal
Published: August 2021

We investigated the angular spectrum of bound state in the continuum (BIC) associated with topological charge and present an empirical tool to characterize BIC. While near-field confirms Bessel-Gaussian distribution, far-field is a perfect vortex.
Physical-layer Security Using Atmosphere-limited Line-of-sight Terahertz Links
Authors: Fang Zhaoji , Mittleman Daniel M.
Published: August 2021

We simulate the properties of atmospheric absorption for a free-space terahertz channel, and propose a method to enable physical-layer security by tuning the carrier frequency relative to a water vapor absorption line.
Picosecond squeezing at 844 nm with a periodically poled LiTaO3 waveguide
Authors: Xu Zicong , Oguchi Kenichi , Sano Yuki , Taguchi Yoshitaka , Katoh Kazuhiro , Ozeki Yasuyuki
Published: August 2021

Aiming at quantum enhancement in < 1 µm, we demonstrate pulsed squeezing with a periodically poled stoichiometric LiTaO3 waveguide. We confirm anti-squeezing of > 7 dB and vacuum squeezing of −1.19 dB at 844 nm.
A SVM Combined Pixel Accumulation Technique for SPAD Based LiDAR System
Authors: Zhang Hualong , Yang Chuanchuan , Chen Hao , Yan Weizhen
Published: August 2021

We present a flash LiDAR system based on SPAD array and a proposed SVM combined accumulation technique was applied in the system to obviously improve the accuracy of depth image.
FMCW Lidar System Based on Cylindrical Lens-assisted Integrated Beam Steering
Authors: Li Chao , Cao Xianyi , Li Xinwan , Wu Kan , Chen Jianping
Published: August 2021

An FMCW (frequency-modulated continuous-wave) Lidar system based on cylindrical lens assisted two-dimensional beam steering is demonstrated. It is tested in ranging experiment for 1m-distance target detection with an FOV of 11.3°×8.1°.
Ultra-flattened and near-zero chromatic dispersion control by chalcogenide all-solid hybrid microstructured optical fibers
Authors: Tuan Tong Hoang , Nguyen Hoa Phuoc Trung , Koumura Ayaka , Suzuki Takenobu , Ohishi Yasutake
Published: August 2021

We demonstrate ultra-flattened (less than 1ps/km.nm) and near-zero chromatic dispersions profiles which can be tailored with high freedom by using our proposed chalcogenide all-solid hybrid microstructure optical fibers.
Modulation of Terahertz Generation in Two-color Photoionization Verified by the Spectral Broadening
Authors: Gong Chen , Kawayama Iwao , Murakami Hironaru , Teramoto Takahiro , Tonouchi Masayoshi
Published: August 2021

We studied the evolution of the two-color laser filament emitted THz pulse energy with the influences of the infrared pump energy and air dispersion. The THz modulation induced by additional relative phase is verified by the two-color spectral broadening due to the intensity dependent nonlinearity.
Graphene plasmonic terahertz lamps
Authors: Li Yuyu , Paiella Roberto
Published: August 2021

We investigate the use of graphene plasmonic excitations for current-driven narrowband THz light emission. Device structures designed to promote critical coupling to free-space radiation are shown to be particularly effective for maximizing the output power.
Buildup Dynamics of Multiple-soliton in Spatiotemporal Mode-locked Multimode Fiber Lasers
Authors: Liu Kewei , Xiao Xiaosheng , Yang Changxi
Published: August 2021

The real-time buildup dynamics of multiple-soliton in spatiotemporal mode-locked fiber lasers are observed. The experimental results indicate that the dynamics vary for different transverse modes, and the multiple-soliton has spatiotemporal structure among the pulses.
A Compact and Tunable Acoustically Induced Mach-Zehnder Interferometer based on Sandwich-like Structure with Uniform Diameter
Authors: Han Xiaofang , Li Caifen , Gao Feng , Dong Xiao , Zhang Guoquan , Xu Jingjun
Published: August 2021

Through phase matching optimization, an acoustically induced tunable in-fiber Mach-Zehnder interferometer less than 7 cm with 120 μs switching time based on a sandwich-like structure with uniform diameter was proposed and demonstrated in the experiment.
End-to-End Optimized High-Speed Single-Pixel Imaging via Pattern Scanning
Authors: Zhang Kangning , Hu Junjie , Yang Weijian
Published: August 2021

We demonstrated a new single-pixel imaging modality synthesizing light scanning and compressed sensing techniques. We optimized the image formation and reconstruction in an end-to-end training framework. Our method enables fast and high-quality compressed imaging.
Reference Wavelength Free Refractometry in Fiber Optic Directional Couplers
Authors: Bawa Garima , Tripathi Saurabh Mani
Published: August 2021

Using dispersion management, opposite spectral shifts around the critical wavelength have been effectively removed. By operating the fiber-optic directional coupler based bio-sensor close to the critical wavelength, we report ultra-high refractive index sensitivity ∼13000 nm/RIU.
Ptychographic Spectral Phase Retrieval by Deep Learning
Authors: Chao Wei-Cheng , Yang Shang-Da
Published: August 2021

Deep leaning is implemented to retrieve the spectral phase profiles of ultrashort pulses by using spectrally truncated spectrograms for the first time (to our best knowledge).
The Formation Mechanism of Femtosecond Laser-induced Periodic Structures on Germanium
Authors: Li Zhixuan , Wu Qiang , Huang Song , Wang Suyuan , Hu Xiaoyang , Jiang Xinda , Yao Jianghong , Xu Jingjun
Published: August 2021

A hydrodynamic model was developed to describe the formation of fs-laser induced periodic structures on Ge based on the thin film equation. The significant role of transient electric field was demonstrated for the first time.
Conditional Machine Learning-Based Inverse Design Across Multiple Classes of Nanophotonic Structures
Authors: Yeung Christopher , Tsai Ryan , Pham Benjamin , King Brian , Kawagoe Yusaku , Ho David , Liang Julia , Knight Mark W. , Raman Aaswath
Published: August 2021

We present a machine learning-based photonics design strategy centered on encoding image colors with material and structural data. Given input target spectra, our model can accurately determine the optimal metasurface class, materials, and structure.
Second-Harmonic-Generation Circular Dichroism in Dielectric Nanoantenna Dimers
Authors: Melik-Gaykazyan Elizaveta , Frizyuk Kristina , Choi Jae-Hyuck , Petrov Mihail , Park Hong-Gyu , Kivshar Yuri
Published: August 2021

We demonstrate experimentally the second-harmonic generation circular dichroism in a dimer of two identical AlGaAs nanoantennas attributed to the hybridization of electric and magnetic Mie-type multipolar optical modes of the nanoantennas.
Deep nonlinear optical neural networks using physics-aware training
Authors: Wright Logan G. , Onodera Tatsuhiro , Stein Martin M. , Wang Tianyu , Schachter Darren T. , Hu Zoey , McMahon Peter L.
Published: August 2021

We experimentally demonstrate deep nonlinear optical neural networks using a universal algorithm for backpropagating through arbitrary physical input-output transformations. Ultrafast second harmonic generation and other diverse processes are trained to perform image and audio classification.
Optomechanical quantum teleportation
Authors: Fiaschi Niccolò , Hensen Bas , Wallucks Andreas , Benevides Rodrigo , Li Jie , Alegre Thiago P. Mayer , Gröblacher Simon
Published: August 2021

Quantum teleportation is a key component in long distance quantum communication protocols. Here we demonstrate quantum teleportation of a polarization-encoded optical input state onto the joint state of a pair of nanomechanical resonators.
Imprinting the quantum statistics of photons on free electrons
Authors: Dahan Raphael , Gorlach Alexey , Haeusler Urs , Karnieli Aviv , Eyal Ori , Yousefi Peyman , Segev Mordechai , Arie Ady , Eisenstein Gadi , Hommelhoff Peter , Kaminer Ido
Published: August 2021

We observe for the first time the breakdown of the wave nature of light in free-electron-light interactions. Our experiment demonstrates a new way of measuring quantum states of light using high- precision electron energy spectroscopy.
Towards photonic time-crystals: observation of a femtosecond time-boundary in the refractive index
Authors: Lustig Eran , Saha Soham , Bordo Eliyahu , DeVault Clayton , Chowdhury Sarah N. , Sharabi Yonatan , Boltasseva Alexandra , Cohen Oren , Shalaev Vladimir M. , Segev Mordechai
Published: August 2021

We demonstrate experimentally a time-boundary for photons in a dielectric medium, analogous to a spatial boundary. Such abrupt temporal changes in the permittivity are necessary for observing time-reflections, photonic time-crystals and momentum bandgaps.
Time lens induced by optical pushbroom effect
Authors: Gaafar Mahmoud A. , Renner Hagen , Eich Manfred , Petrov Alexander Yu.
Published: August 2021

We show analytically and by numerical simulation an on-chip time lens based on the optical pushbroom effect. Furthermore, we demonstrate this effect inside a silicon Bragg grating waveguide. A fast free carriers front generated inside the waveguide collects and traps the energy of a signal wave with smaller group velocity tuned near to the band gap of the waveguide with hyperbolic dispersion. The energy of the signal wave is accumulated inside the front and distributed in frequency. The presented effect can be utilized to compress signals in time and space.
Shaping Quantum Photonic States Using Free Electrons
Authors: Ben Hayun Adi , Reinhardt Ori , Nemirovsky Jonathan , Karnieli Aviv , Rivera Nicholas , Kaminer Ido
Published: August 2021

We propose a new scheme for creating desired quantum photonic states using interactions of free electrons with optical cavities. We show how the choice of the initial electron state controls the resulting quantum light state.
Efficient Interaction of X-ray Single Photons with a Beam Splitter
Authors: Strizhevsky E. , Borodin D. , Schori A. , Francoual S. , Röhlsberger R. , Shwartz S.
Published: August 2021

We demonstrate efficient interaction of hard x-ray single photons with a beam splitter for the first time and use it to show the nonclassical behavior of x-ray heralded photons.
Experimental shot-by-shot estimation of quantum measurement accuracy
Authors: Annafianto N. Fajar R. , Burenkov Ivan A. , Jabir M. V. , Battou Abdella , Polyakov Sergey V.
Published: August 2021

We show the direct correspondence between Bayesian probabilities obtained by the adaptive quantum measurement and experimentally observed Kholmogorov probabilities. We demonstrate the single-“shot” accuracy estimation for every individual quantum measurement outcome using these Bayesian probabilities.
A Reconfigurable Quantum Local Area Network Over Deployed Fiber
Authors: Alshowkan Muneer , Williams Brian P. , Evans Philip G. , Rao Nageswara S. V. , Simmerman Emma M. , Lingaraju Navin B. , Lu Hsuan-Hao , Weiner Andrew M. , Peters Nicholas A. , Lukens Joseph M.
Published: August 2021

We demonstrate a three-node telecom quantum local area network over deployed fiber. It has eight independent entanglement channels which are dynamically reconfigurable. We successfully show entanglement demand balancing across the network and quantify its quality.
Experimental quantum conference key agreement
Authors: Ho Joseph , Proietti Massimilliano , Grasselli Federico , Barrow Peter , Malik Mehul , Fedrizzi Alessandro
Published: August 2021

We report a proof-of-principle demonstration of four-party quantum confer ence agreement using photonic GHZ (Greenberger-Horne-Zeilinger) states transmitted in fiber. Our results demonstrate the viability of multi-user entangled-based quantum key distribution beyond the two-party paradigm.
Ultrafast Optical Rotation: Highly Sensitive Enantio-Discrimination with Controlled Few-Cycle Optical Pulses
Authors: Ayuso David , Ordonez Andres , Ivanov Misha , Smirnova Olga
Published: August 2021

We introduce ultrafast optical rotation: a highly efficient method for chiral discrimination using few-cycle pulses. Sub-cycle optical control enables full control over the enantio-sensitive response of matter in a molecule-specific manner and on ultrafast timescales.
Reconfigurable semiconductor currents driven by ultrafast coherent control with structured light
Authors: Sederberg Shawn , Jana Kamalesh , Herperger Katherine R. , Corkum Paul B.
Published: August 2021

We apply femtosecond pulses with vectorized or structured spatial modes to coherent control of currents. We excite and measure complex and reconfigurable current patterns in a semiconductor, with an emphasis on generating magnetic fields.
Soft X-ray Attosecond Control via Parametric Waveform Synthesis
Authors: Silva-Toledo Miguel A. , Scheiba Fabian , Mainz Roland E. , Yang Yudong , Cirmi Giovanni , Rossi Giulio Maria , Kartner Fränz X.
Published: August 2021

Soft X-ray high-harmonic continua reaching 0.2 keV are observed in neon at 300 mbar, using tailored fields from a parametric waveform synthesizer. Waveform-controlled continua show signatures of isolated attosecond pulse generation with distinct spectral envelopes.
1.1-GW 213-as soft-x ray isolated attosecond pulse created by a fully stabilized 50-mJ three-channel optical waveform synthesizer
Authors: Xue Bing , Midorikawa Katsumi , Takahashi Eiji J.
Published: August 2021

A GW-scale isolated attosecond pulse is demonstrated by a fully stabilized 50-mJ three-channel waveform synthesizers. Isolated pulse duration with 213-as, 0.24-μJ is experimentally characterized by the FROG-CRAB method with a 10-Hz repetition rate.
Super-resolution Momentum-comb Spectroscopy of Quantum-material Bands
Authors: Borsch Markus , Schmid Christoph P. , Weigl Leonard , Schlauderer Stefan , Lange Christoph , Steiner Johannes T. , Koch Stephan W. , Huber Rupert , Kira Mack
Published: August 2021

Our theory-experiment comparison discovers crystal-momentum combs, electronic interferences in momentum space, in harmonic sideband emission and demonstrates how the comb lines assign electronic bands of quantum materials with super-resolution.
The Fock-State Laser: Macroscopic Quantum States of Light Based on Deep Strong Light-Matter Coupling
Authors: Rivera Nicholas , Sloan Jamison , Kaminer Ido , Soljačić Marin
Published: August 2021

We show that coupled light-matter systems reaching the deep strong coupling regime can be coupled to gain media to form novel types of lasers emitting macroscopic quantum states of light, e.g. many-photon Fock states.
Observation of the fundamental length scale of Branched Flow of light
Authors: Saiji Shruti J. , Bandres Miguel A.
Published: August 2021

Branched flow is a universal phenomenon in which waves form channels of enhance intensity that keep dividing as they propagate. We experimentally demonstrate the scaling behavior of the fundamental branching length for general anisotropic media.
Optical Coherence Transfer Mediated by Free Electrons
Authors: Kfir Ofer , Di Giulio Valerio , de Abajo F. Javier García , Ropers Claus
Published: August 2021

We investigate the optical coherence properties carried by the quantum state of a single free-flying charged and massive particle – the electron. We propose feasible Mach-Zehnder-like linear and nonlinear optical interferometric detection, incorporating electron-microscope beams.
Active spatial modulation of free electrons by controlling the shape and intensity of plasmonic fields
Authors: Tsesses Shai , Dahan Raphael , Wang Kangpeng , Reinhardt Ori , Bartal Guy , Kaminer Ido
Published: August 2021

We present active spatial shaping of free-electron wavepackets through their interaction with specially-designed interference patterns of surface plasmons and via the nonlinear intensity dependence of the electron-plasmon interaction.
Quantum-to-classical transition of laser-shaped ultrafast free electrons in phase space
Authors: Zhang Bin , Gover Avraham , Kaminer Ido , Pan Yiming
Published: August 2021

Here, we propose a Smith-Purcell model for shaping free electrons with laser. We find that the quantum interference and deformation of the modulated electrons in phase space are vital for understanding the quantum-to-classical transition.
A general framework for shaping luminescence in materials
Authors: Roques-Carmes Charles , Rivera Nicholas , Ghorashi Ali , Kooi Steven E. , Yang Yi , Lin Zin , Beroz Justin , Joannopoulos John D. , Kaminer Ido , Johnson Steven , Soljačić Marin
Published: August 2021

We develop a general framework to describe non-equilibrium radiation by materials in nanophotonic structures (such as photoluminescence/cathodoluminescence/scintillation). We demonstrate the concept experimentally, enhancing and shaping cathodoluminescence from a silica photonic crystal.
Observation of 2D Cherenkov radiation and its Quantized Photonic Nature Using Free-Electrons
Authors: Adiv Yuval , Hu Hao , Tsesses Shai , Dahan Raphael , Wang Kangpeng , Kurman Yaniv , Chen Hongsheng , Lin Xiao , Bartal Guy , Kaminer Ido
Published: August 2021

Using a dispersion-engineered structure supporting hybrid photonic-plasmonic surface polaritons, we present the first observation of 2D Cherenkov radiation from free electrons, with record-strong electron–polariton quantum coupling that reaches the single-electron-single-photon interaction regime.
Photonic Meron Spin Texture in Momentum Space
Authors: Guo Cheng , Xiao Meng , Guo Yu , Yuan Luqi , Fan Shanhui
Published: August 2021

We show that a momentum-space meron spin texture for electromagnetic fields in free space can be generated by controlling the interaction of light with a photonic crystal slab having a nonzero Berry curvature. Our work highlights the opportunities of using photonic structures for the exploration of topological spin textures.
Time Diffraction in an Epsilon-Near-Zero Metasurface
Authors: Tirole Romain , Attavar Taran , Dranczewski Jakub , Galiffi Emanuele , Pendry John , Maier Stefan , Vezzoli Stefano , Sapienza Riccardo
Published: August 2021

We observe strong, efficient all-optical modulations and frequency-shift due to time diffraction in a thin film of ITO over gold. Excitation of the B erreman mode leads to redshift and spectral broadening from a nonlinear grating.
Multipartite d-level photon cluster states and practical entanglement detection through witness operators
Authors: Sciara Stefania , Reimer Christian , Roztocki Piotr , Moss David J. , Caspani Lucia , Munro William J. , Kues Michael , Morandotti Roberto
Published: August 2021

We develop witness operators enabling the practical detection of arbitrary complex photon states and apply them to validate the entanglement of the first multipartite d-level cluster state achieved through simultaneous time- and frequency-entanglement.
Benchmarking Quantum Correlations in Scalable Photonic Systems
Authors: Sperling Jan , Tiedau Johannes , Engelkemeier Melanie , Brecht Benjamin , Silberhorn Christine
Published: August 2021

A benchmark protocol is established to certify quantum correlations, demanding an exponential increase of resources. We handle this scaling and show nonclassicality of up to ten photons distributed over more than sixty modes.
Ultrafast electron diffractometer with Terahertz-driven pulse compression
Authors: Zhang Dongfang , Kroh Tobias , Ritzkowsky Felix , Rohwer Timm , Fakhari Moein , Cankaya Huseyin , Calendron Anne-Laure , Matlis Nicholas H. , Kärtner Franz X.
Published: August 2021

We built an ultrafast electron diffractometer, which utilizes a Terahertz driven pulse compressor to probe the ultrafast dynamics of single-crystal silicon. We demonstrate high-quality diffraction with improved time resolution.
Charge Dynamics Electron Microscopy
Authors: Gargiulo Simone , Madan Ivan , Barantani Francesco , Berruto Gabriele , Yannai Michael , Dias Eduardo J. C. , Dahan Raphael , Kaminer Ido , Vanacore Giovanni Maria , de Abajo F. Javier García , Carbone Fabrizio
Published: August 2021

We probe plasma dynamics with nm-fs resolution through electron spectroscopy performed in an ultrafast transmission electron microscope. This approach would allow to disentangle the dynamic evolution of plasma parameters and observe previously inaccessible energy inhomogeneities.
Observation of Ultrafast Self-Action Effects in Resonant Dielectric Metasurfaces
Authors: Sinev Ivan , Liu Zhuojun , Rudenko Anton , Koshelev Kirill , Ladutenko Konstantin , Shcherbakov Alexey , Sadrieva Zarina , Itina Tatiana , Bogdanov Andrey , Kivshar Yuri
Published: August 2021

We observe a blueshift of the generated third-harmonic signal on subpicosec-ond timescales enabled by multiphoton absorption in resonant silicon metasurfaces. We demonstrate a transition from a super-cubic to sub-cubic regime for the third-harmonic generation efficiency.
Exceptional Points in Photonic Grating Band Diagrams Lead to Decay-Free Radiation
Authors: Yulaev Alexander , Kim Sangsik , Li Qing , Westly Daron A. , Roxworthy Brian J. , Srinivasan Kartik , Aksyuk Vladimir
Published: August 2021

We demonstrate that exceptional points in a photonic band diagram lead to constant-intensity free-space beams projected from grating couplers. Our findings pave the way for projecting spatially broad free-space beams with decay-free profiles.
Anderson localization of hybrid quasiparticles: Anomalous transmission due to necklace states
Authors: Mondal Sandip , Balasubrahmaniyam M. , Sahoo Himadri , Patankar Meghan , Vijayaraghavan R. , Mujumdar Sushil
Published: August 2021

We report a novel transport regime under Anderson-localizing disorder conditions, wherein hybrid photon-plasmon quasiparticles undergo strong transmission. The effect occurs due to creation of necklace states enabled by closely-spaced eigenstates that exchange energy due to inherent non-Hermiticity.
Light Scattering of Random Close Packed Nanorods
Authors: Odeh Mutasem , Dupré Matthieu , Kim Kevin , Kanté Boubacar
Published: August 2021

In this work, we investigate the scattering behavior of nanorods that are randomly packed at various densities and aspect ratios. We show that the maximum packing density, maximum scattering density, and the percolation threshold are all tightly related to Onsager excluded-area principle.
Entanglement-Assisted Communication Surpassing the Ultimate Classical Capacity
Authors: Hao Shuhong , Shi Haowei , Li Wei , Zhuang Quntao , Zhang Zheshen
Published: August 2021

We report experimental entanglement-assisted communication above the ultimate classical capacity set by the Holevo-Schumacher-Westmorel bound. A high-efficiency entanglement source and a phase-conjugate quantum receiver reap the benefit of pre-shared entanglement over lossy and noisy channels.
Two-Photon Absorption in Molecules by time-frequency-entangled photon pairs: the roles of photon-number correlations and spectral correlations
Authors: Raymer Michael G. , Landes Tiemo , Allgaier Markus , Merkouche Sofiane , Smith Brian J. , Marcus Andrew H.
Published: August 2021

Two-photon absorption is enhanced by time-frequency entanglement of photon pairs at extremely low optical flux, yet we find theoretically that for typical molecules TPA event rates are so low as to be unobservable.
Bounding Entangled Two-Photon Absorption with Sensitive Transmittance Measurements
Authors: Mazurek Michael D. , Parzuchowski Kristen M. , Mikhaylov Alexander , Nam Sae Woo , Camp Charles H. , Gerrits Thomas , Jimenez Ralph , Stevens Martin J.
Published: August 2021

Two-photon absorption rates may be enhanced with energy-time entangled states of light. Using a sensitive transmittance measurement we find no evidence of this enhancement, in disagreement with previously reported results.
Two photon emission from superluminal and accelerating index changes
Authors: Sloan Jamison , Rivera Nicholas , Joannopoulos John D. , Soljačić Marin
Published: August 2021

We show that superluminal and accelerating index perturbations in dielectric media can act as sources of entangled photon pairs. We show how these sources can be realized in various nonlinear nanophotonic platforms.
Nonlinear optics with one molecule and two photons
Authors: Pscherer André , Meierhofer Manuel , Wang Daqing , Kelkar Hrishikesh , Martín-Cano Diego , Utikal Tobias , Götzinger Stephan , Sandoghdar Vahid
Published: August 2021

We use single solid state organic molecules strongly coupled to a tunable Fabry-Perot microcavity to perform nonlinear optics experiments at the single quantum limit.
Quantum entanglement and modulation enhancement of free-electron–bound-electron interaction
Authors: Zhao Zhexin , Sun Xiao-Qi , Fan Shanhui
Published: August 2021

We study the modulation enhancement of interaction and entanglement between distant atoms in the interaction between free electron and two-level atoms.
Superradiant and subradiant light emission from entangled free electrons
Authors: Karnieli Aviv , Rivera Nicholas , Kaminer Ido , Arie Ady
Published: August 2021

We show how quantum correlations such as entanglement give rise to a new quantum regime of superradaince and subradiance from free-electrons, demonstrating that light emission can be sensitive to the quantum state of many-body wavefunctions.
Majorana Bound State Cavities
Authors: Bahari B. , Choi J-H. , Liu Y. G. N. , Christodoulides D. N. , Khajavikhan M.
Published: August 2021

We present a new class of topological cavities based on Majorana bound states. These cavities are inherently single-moded and robust to local disorder regardless of the size of the structure.
The Linewidth Enhancement Factor in a Microcavity Brillouin Laser
Authors: Yuan Zhiquan , Wang Heming , We Lue , Gao Maodong , Vahala Kerry
Published: August 2021

Amplitude-phase coupling can enhance the linewidth of regenerative oscillators and lasers. Here, in Brillouin lasers, the coupling is shown to originate from phase mismatch. Linewidth enhancements as large as 50× are measured.
Universal flip-flopping and self-symmetrization of symmetry-breaking dynamics in passive Kerr resonators
Authors: Fatome Julien , Xu Gang , Garbin Bruno , Berti Nicolas , Oppo Gian-Luca , Murdoch Stuart G. , Erkintalo Miro , Coen Stéphane
Published: August 2021

We report on how a π-phase defect in a two-mode Kerr cavity leads to flip-flopping dynamics and self-symmetrization, enabling spontaneous symmetry breaking with unprecedented robustness. Experiments performed with homogeneous and localized states confirm our predictions.
Real-Time Study of Coexisting States in Laser Cavity Solitons
Authors: Hanzard Pierre Henry , Rowley Maxwell , Cutrona Antonio , Chu Sai T. , Little Brent E. , Morandotti Roberto , Moss David J. , Wetzel Benjamin , Gongora Juan Sebastian Totero , Peccianti Marco , Pasquazi Alessia
Published: August 2021

We experimentally demonstrate the presence of two coexisting states in Laser Cavity Solitons (LCS) Microcombs. By using the Dispersive Fourier Transform technique, we show the simultaneous presence of both LCS and a background modulation.
Multiplexed and broadband quantum storage of single-photons at telecom C-band
Authors: Wei Shi-Hai , Jing Bo , Zhang Xue-Ying , Wang He-Qing , Li Hao , You Li-Xing , Wang Zhen , Wang You , Deng Guang-Wei , Song Hai-Zhi , Oblak Daniel , Guo Guang-Can , Zhou Qiang
Published: August 2021

We prepare five separated 10-GHz atomic frequency combs (AFCs) simultaneously in Er3+-doped fiber, then demonstrate temporally- and spectrally-multiplexed storage of telecom-band single-photons up to 1650 modes. Our results pave the way for quantum repeaters with multiplexed and broadband quantum memory.
Optical Coherence Increase by Diffusion Enhanced Optical Pumping in a Rare-Earth Doped Crystal
Authors: Welinski Sacha , Ferrier Alban , Goldner Philippe , Tiranov Alexey , Businger Moritz , Afzelius Mikael
Published: August 2021

We demonstrate a new spin polarization mechanism that combines optical pumping with spin diffusion to achieve large spin polarization in 171Yb3+:Y2SiO5. This is used to increase optical coherence lifetime from 0.3 to 0.8 ms.
Fano discrete-continuum interactions in broadband parametric downconversion
Authors: Yanagimoto Ryotatsu , Ng Edwin , Jankowski Marc , Onodera Tatsuhiro , Fejer Martin M. , Mabuchi Hideo
Published: August 2021

We identify broadband parametric downconversion (PDC) in the few-pump-photon regime as a Fano-type discrete-continuum interaction. We derive analytic expressions for PDC dynamics, revealing quantum phenomena including complete pump depletion and bound states in the continuum.
Graded Nanofilm Controlled Dispersion and Supercontinuum Generation in Exposed Core Fibers
Authors: Lühder Tilman A. K. , Schneidewind Henrik , Goerke Sebastian , Schaarschmidt Kay , Schartner Erik P. , Ebendorff-Heidepriem Heike , Schmidt Markus A.
Published: August 2021

Depositing high refractive index nanofilms with controlled thicknesses on exposed core fibers enables thickness tunable supercontinuum generation. Thickness gradients along the fiber allow for optimizing for spectral flatness and extension of bandwidth toward the infrared.
SEIRA Sensing of Different Sugars at Physiological Concentrations
Authors: Pfezer Diana , Karst Julian , Kühner Lucca , Hentschel Mario , Giessen Harald
Published: August 2021

We utilize resonant plasmonic surface-enhanced infrared absorption in combination with machine learning principal component analysis to detect aqueous glucose solutions down to g/l and to differentiate between five various sugars simultaneously.
Spontaneous and Stimulated Three Photon Generation
Authors: Banic M. , Liscidini M. , Quesada N. , Sipe J. E.
Published: August 2021

We study spontaneous and stimulated three photon generation rates in resonant and non-resonant structures. In the stimulated regime, we find that current technology allows for the generation of 105 photons per second in both structures.
Mid-Infrared Photon-Pair Generation in AgGaS2 crystals
Authors: Kumar Mohit , Pertsch Thomas , Setzpfandt Frank
Published: August 2021

We demonstrate non-degenerate photon-pair generation by spontaneous parametric down conversion in silver gallium sulfide AgGaS2. Idler photons in the mid-infrared spectral range above 6 µm wavelength are generated with corresponding signal photons in the visible.
Exploring Collective Quantum Phaenomena Using Nanofiber Mediated Atom-Light Interaction
Authors: Berroir Jérémy , Ray Tridib , Corzo Neil V. , Raskop Jérémy , Kupriyanov Dmitriy V. , Urvoy Alban , Laurat Julien
Published: August 2021

We report storage and retrieval of a single collective excitation of an atomic ensemble coupled to an optical nanofiber. We further provide theoretical and experimental advances on controllable atomic Bragg mirrors and atomic cavity systems.
Systematic design of photonic crystal waveguides for strong coupling with trapped cold atoms
Authors: Bouscal Adrien , Urvoy Alban , Berroir Jérémy , Ray Tridib , Kemiche Malik , Mahapatra Sukanya , Raineri Fabrice , Levenson Ariel , Bencheikh Kamel , Sauvan Christophe , Greffet Jean-Jacques , Laurat Julien
Published: August 2021

We present a proposal for trapping Rubidium cold atoms near a novel design of a GaInP photonic crystal waveguide with characteristics optimized through systematic and inverse design. Purcell factors higher than unity are predicted.
Telecom Spin-Photon Quantum Interface Based on Silicon Nanophotonics
Authors: Wicker Christina , Huang Yizhong , Qiao Hong , Zhong Tian
Published: August 2021

We develop a telecom-band nanophotonic spin-photon interface with erbium dopants in silicon. We perform photoluminescence spectroscopy of Er3+ in silicon-on-insulator (SOI) wafers and measure Purcell enhancement, optical linewidths and transition dipoles in nanophotonic cavities. Comments and questions should be directed to Tian Zhong (tel: +1 773.834.4237, e-mail: tzh@uchicago.edu).
Quantum optics in strongly-driven many-body systems
Authors: Pizzi Andrea , Gorlach Alexey , Rivera Nicholas , Nunnenkamp Andreas , Kaminer Ido
Published: August 2021

We develop the quantum theory of collective light emission in strongly-driven many-body systems. We show how quantum correlations of the emitters can be transferred to the emitted light, leading to generation of non-classical many-photon states.
Generation of Topologically Protected Hyper-entangled States
Authors: Bergamasco Nicola , Sipe J.E. , Liscidini Marco
Published: August 2021

We study spontaneous parametric down conversion in a waveguide array supporting two strongly coupled topological guided modes. Quantum correlations in the generated hyper-entangled quantum state are robust due to topological protection.
Plasmon-induced Charge Transport at Transition Metal Nitride-Semiconductor Interfaces via In Situ Nanoimaging
Authors: Yu Min-Wen , Ishii Satoshi , Shinde Satish Laxman , Tanjaya Nicholaus Kevin , Chen Kuo-Ping , Nagao Tadaaki
Published: August 2021

Photoexcited Kelvin probe force microscope is used to image hot carriers excited in transition metal nitride-semiconductor heterostructures. Both hot holes are hot electron injections are revealed depending on the carrier types of the semiconductors.
Metasurface Integrated Monolayer Exciton-polariton
Authors: Chen Yueyang , Miao Shengnan , Wang Tianmeng , Zhong Ding , Saxena Abhi , Chow Colin , Whitehead James , Gerace Dario , Xu Xiaodong , Shi Su-Fei , Majumdar Arka
Published: August 2021

We demonstrate a 2D exciton-polariton system by strongly coupling atomically thin tungsten diselenide monolayer to a silicon nitride metasurface. Our platform opens the door for the future development of exciton-polariton devices by advanced meta-optical engineering.
Strong Exciton-Photon Interactions in the van der Waals Materials Probed by Electron Beams
Authors: Taleb Masoud , Lingstädt Robin , Hentschel Mario , Mashhadi Soudabeh , Burghard Marko , Giessen Harald , van Aken Peter A. , Talebi Nahid
Published: August 2021

Excitons in semiconducting van der Waals materials are quasi-particles with high potential applications in optoelectronics and nonlinear physics. However, their strong interaction with light and the formation of exciton-polaritons normally require the exploitation of massive photonic cavities. Here, we demonstrate strong exciton-photon interactions without the requirements for photonic cavities in Bi2Se3 and WSe2 thin films, using cathodoluminescence (CL) spectroscopy and angle-resolved CL mapping, as well as electron energy-loss spectroscopy.
Exciton Resonance Tuning in Atomically-Thin Optical Elements
Authors: van de Groep Jorik , Song Jung-Hwan , Li Qitong , Celano Umberto , Kik Pieter G. , Brongersma Mark L.
Published: August 2021

We demonstrate accurate and dynamic control over light scattering by exciton resonances in atomically-thin optical elements by carving them directly out of monolayer WS2. Using ion-liquid gating we dynamically manipulate the material’s exciton resonance.
Inverse design of relativistic lightsail for efficient propulsion
Authors: Jin Weiliang , Li Wei , Orenstein Meir , Fan Shanhui
Published: August 2021

We present a comprehensive study of photonic design of lightsails with large-scale optimization techniques. We show that the optimal structure is relatively simple, yet exhibiting nearly 50% enhancement in propulsion efficiency compared to prior studies.
Metasurface design optimization via D-Wave based sampling
Authors: Wilson Blake A. , Kudyshev Zhaxylyk A. , Kildishev Alexander V. , Kais Sabre , Shalaev Vladimir M. , Boltasseva Alexandra
Published: August 2021

The developed design framework employs the D-Wave to enable global optimization of meta-devices with complex topologies and material composition. The framework opens up the pathways to solving broad range of highly-constrained optimization problems of nanophotonics.
Statistical learning multiobjective optimization for large-scale achromatic metalens at visible regime
Authors: Elsawy Mahmoud M. R. , Binois Mickaël , Duvigneau Régis , Lanteri Stéphane , Genevet Patrice
Published: August 2021

A novel computational methodology based on statistical learning multiobjective optimization is developed to optimize large-scale achromatic 3D metalenses in the visible regime. The optimized lens has a numerical aperture of 0.56 and an average focusing efficiency of 45%.
Solving integral equations with inverse-designed metagratings at optical wavelengths
Authors: Cordaro Andrea , Edwards Brian , Nikkhah Vahid , Alù Andrea , Engheta Nader , Polman Albert
Published: August 2021

Inverse designed metasurfaces can solve prescribed Fredholm integral equations at optical wavelengths. To this end, a mirror is included to provide the feedback required to perform the Neumann series that solves the equation.
Teleportation-Based Photonic Quantum Computing Using a Single Controllable Qubit
Authors: Bartlett Ben , Dutt Avik , Fan Shanhui
Published: August 2021

We propose a photonic quantum computer which uses no single-photon detectors and requires minimal quantum resources: one coherently-controlled atom. Arbitrary quantum circuits are deterministically constructed from rotations teleported from the atom onto the photonic qubits.
Nonlocal sensing of temporal delay in dispersive links using time-energy entangled photons
Authors: Seshadri Suparna , Lu Hsuan-Hao , Lingaraju Navin B. , Imany Poolad , Leaird Daniel E. , Weiner Andrew M.
Published: August 2021

We employ electro-optic frequency mixing to achieve precision measurement of temporal delay between dispersive fiber-optic links by taking advantage of high-dimensional frequency-bin entanglement in a nonlocal sensing geometry.
Joint Measurement of Time-frequency Entanglement
Authors: Han Liu , Helmy Amr S.
Published: August 2021

We report a novel method to simultaneously measure the time difference and frequency sum of two photons. This technique applied to target detection can asymptotically reduce the effect of environmental noise down to zero.
Randomized Compressive State Tomography in Time and Frequency Using a Quantum Pulse Gate
Authors: Gil-Lopez Jano , De Syamsundar , Brecht Benjamin , Teo Yong Siah , Jeong Hyunseok , Sanchez-Soto Luis L. , Silberhorn Christine
Published: August 2021

We discuss a randomized compressive tomography scheme that characterizes near-coherent signals of low rank in the time-frequency domain using extremely few measurements and no assumptions. Results on higher order temporal modes of the electromagnetic field are presented.
Entanglement-Enhanced Interferometry in Optical Fiber
Authors: Krueper Gregory R. , Mellors Robert , Yu Charles , Libby Stephen B. , Messerly Michael , Gopinath Juliet T.
Published: August 2021

Fiber-based interferometry with entangled photons can provide sub-shot-noise resolution, which is ideal for photon-starved applications. Simulations demonstrate that measurements with realistic losses and other imperfections show quantum-enhanced phase resolution for practical applications.
Laser Refrigeration of Sodium Yttrium Fluoride Nanoparticles in a Vacuum Optical Tweezer
Authors: Luntz-Martin Danika R. , Felsted R. Greg , Dadras Siamak , Pauzauskie Peter J. , Vamivakas A. Nick
Published: August 2021

Laser refrigeration of rare-earth doped optically levitated nanoparticles allows for cooling of 42 K. Cooling is calibrated using a cryostat. Cooling efficiency decreases at pressures below 5 mbar as thermal contact with gas molecules decreases.
Topological insulator vertically-emitting laser array
Authors: Dikopoltsev Alex , Harder Tristan H. , Lustig Eran , Egorov Oleg A. , Beierlein Johannes , Wolf Adriana , Emmerling Monika , Schneider Christian , Höfling Sven , Segev Mordechai , Klembt Sebastian
Published: August 2021

We present the first experimental demonstration of a topological insulator VCSEL array. Our laser consists of 30 emitters, emitting in a single frequency, displaying interference proving that the emitters act as a single laser.
Nonlinear effects on topologically protected linear modes of Su-Schrieffer-Heeger photonic lattices
Authors: Guo Min , Xia Shiqi , Wang Nan , Song Daohong , Chen Zhigang , Yang Jianke
Published: August 2021

Effects of nonlinearity on topologically protected linear modes in photonic SSH lattices are studied theoretically and experimentally. Nonlinearity turns these linear modes into weakly nonlinear topological gap solitons that cannot sustain high powers.