bluuebunny/crossref_metadata_2025 huggingface dataset:
Plasmonic-Organic-Hybrid (POH) Modulators - a Powerful Platform for Next-Generation Integrated Circuits
Authors: Hoessbacher Claudia , Habegger Patrick , Destraz Marcel , Hammond Scott R. , Johnson Lewis E. , Meier Norbert , De Leo Eva , Baeuerle Benedikt , Heni Wolfgang
Published: November 2021

We present reliability studies of plasmonic-organic-hybrid modulators for high-speed optical communications. By exclusion of oxygen and water, demanding thermal environments and high optical power levels can be tolerated.
Heterogeneously Integrated O-band SG-DBR Lasers for Short Reach Analog Coherent Links
Authors: Misak Stephen , Maharry Aaron , Liu Junqian , Kumar Ranjeet , Huang Duanni , Gilardi Giovanni , Jones Richard , Liu Ansheng , Coldren Larry , Schow Clint
Published: November 2021

We report record performance for a heterogeneously integrated O-band SG-DBR laser, achieving a tuning range of 48 nm, 50 dB MSR, >20 mW output power, and ~0.67 MHz apparent linewidth.
Broadband Repeatable <0.025 dB Average Loss Rapid Adiabatic Based 3-dB Coupler in a 45 nm SOI CMOS Process
Authors: Fargas Cabanillas Josep M. , Bappi Golam , Kita Derek M. , Van Orden Derek , Khilo Anatol , Sedgwick Forrest , Fini John , Popović Miloš A. , Wade Mark T.
Published: November 2021

We demonstrate a 75 µm-long rapid adiabatic coupler (RAC) with an average insertion loss <0.025 dB/coupler and an average power splitting ratio of 50±1.09% over 40 nm bandwidth and 68 reticles across a 300 mm 45 nm SOI CMOS wafer.
Systolic Nanofabrication of Photonic Bioarchitectures
Authors: Papachristopoulou Konstantina , Vainos Nikolaos A.
Published: November 2021

Aerogel/xerogel casts of natural specimens conformally downsized render novel devices for sensor and other applications. Fusion of porous skeletons preserves the stereometric forms yielding 3-dimensional functional micro/nanophotonic solid replicas.
Broadband Metasurface Absorber Based on Metal-dielectric Nanodisks
Authors: Cai Zixin , He Xin , Sun Xinjie , Liu Xu , Hao Xiang
Published: November 2021

This paper presents a metasurface based on plasmonics theory with a wide absorption band from 500 nm to 1,600 nm, which can be used in the photodetector for various imaging applications.
Circular Polarizer Based on Multi-stack Plasmonic Nanostructure for Optical Communication
Authors: Sun Xinjie , He Xin , Cai Zixin , Liu Xu , Hao Xiang
Published: November 2021

We propose a circular polarizer design based on plasmonic nanostructure for optical communication applications. Our design achieves a high circular dichroism transmission (CDT) of 0.97 at 1300nm and 0.90 at 1310nm wavelength.
Current Frequency Chirping of a Laser Diode in Self-Injection Locking Regime
Authors: Shitikov Artem E. , Benderov Oleg V. , Kondratiev Nikita M. , Lobanov Valery E. , Bilenko Igor A.
Published: November 2021

Self-injection locking of a laser diode to a high-quality-factor microresonator is widely used for frequency stabilization. We demonstrate electrically-driven fast continuous tunability and linear frequency modulation in the SIL regime via current tuning.
Generation of Platicons in Optical Microresonators via Thermal Effects
Authors: Lobanov Valery E. , Kondratiev Nikita M. , Bilenko Igor A.
Published: November 2021

We show numerically that negative thermal effects can induce the generation of platicons in optical microresonators with normal GVD. Two excitation regimes are identified: smooth and oscillatory. The possibility of turn-key operation is also demonstrated.
Modeling of Thermal Effects in the Regime of Self-Injection Locking and Frequency Comb Generation
Authors: Kondratiev Nikita M. , Lobanov Valery E.
Published: November 2021

We developed a numerical model describing the thermal effects in the self- injection locking regime with subsequent frequency comb generation. The ability of self- injection locking to suppress the thermal shift and instability was studied.
Fundamental and Vortex Dissipative Quadratic Solitons Supported by Localized Gain
Authors: Lobanov Valery E. , Kalinovich Aleksey A. , Borovkova Olga V.
Published: November 2021

We show that spatially-localized linear gain supports stable 2D fundamental and vortex quadratic solitons in dissipative media. Existence and stability domains are found for systems with gain acting at fundamental frequency or at second harmonic.
Simulation of Electrically-Controlled Mode Interaction for Adiabatic and Deterministic Single Soliton Generation
Authors: Calvo-Salcedo Andres F. , Tu Chaoran , Gonzalez Neil Guerrero , Menyuk Curtis , Jaramillo-Villegas Jose A.
Published: November 2021

We demonstrate numerically the deterministic generation of a dissipative Kerr soliton in coupled Si3N4 microrings resonators using electrically-controlled mode interac- tions. We use a constant pump power and linearly sweep frequency.
Large-scale, >100000DPI full color gamut on rigid and flexible substrates with self-assembled hierarchical nanostructures
Authors: Li Ning , Xiang Fei , Makarenko Maksim , Lopez Arturo B. , Getman Fedor , Fratalocchi Andrea
Published: November 2021

We developed an inexpensive structural color technique achieving full gamut at 127000 DPI on 4-inch rigid and flexible wafers via wet-chemistry of self-assembled three- dimensional dielectric nanostructures with complex hierarchical features.
High-speed analysis of spectroscopic ellipsometry data using deep learning methods
Authors: Li Yifei , Wu Yifeng , Yu Heshan , Takeuchi Ichiro , Jaramillo Rafael
Published: November 2021

We develop deep-learning methods for rapid analysis of spectroscopic ellipsometry data. Our approach speeds analysis by thousand-fold compared to traditional methods. We demonstrate the usefulness of our approach for a high-throughput study of phase-change alloys.
Electrically Actuated Varifocal Lens Based on a Liquid- crystal-encapsulated Semiconductor Metasurface
Authors: Bosch Melissa , Shcherbakov Maxim R. , Won Kanghee , Lee Hong-Seok , Shvets Gennady
Published: November 2021

An ultrathin electrically controlled varifocal lens based on a liquid crystal encapsulated semiconductor metasurface is demonstrated. Owing to their ultrathin thickness and adaptable design, LC-driven semiconductor metasurfaces offer new prospects for modern imaging technologies.
Meta-objective with sub-micrometer resolution for microendoscopes
Authors: Liu Yan , Yu Qing-Yun , Chen Ze-Ming , Qiu Hao-Yang , Chen Rui , Jiang Shao-Ji , He Xin-Tao , Zhao Fu-Li , Dong Jian-Wen
Published: November 2021

We introduced a meta-objective based on silicon nitride cascaded metalens. It can achieve sub-micrometer resolution in a wide FOV. Combined with fiber bundle microscope system, the outline of biological cells can be clearly distinguished.
Immersion-free Non-contact Imaging of Sub-wavelength Nanostructures Down to 55 nm with Super-resolution Microsphere Amplifying Lens (SMAL)
Authors: Stanescu Sorin Laurentiu , Vilain Sébastien , Lonsdale Daniel , Li Lin
Published: November 2021

The resolution of optical microscopes is typically limited by the optical diffraction limit of half of the light wavelength in air. For visible light, this limit is 200 nm. Here we show that using a new, patented super-resolution microsphere amplifying lens (SMAL), we can resolve 55 nanometers features and 80 nm nanoparticles. At the same time, large area imaging has been realized by rapid scanning and image stitching.
Dense and Residual Neural Networks for Full-waveform LiDAR Echo Decomposition
Authors: Liu Gangping , Ke Jun
Published: November 2021

For full-waveform LiDAR echo signals, a high efficient and accurate decomposition method based on a dense (Full-waveform Dense Connection Network, FDCN) and a residual neural networks (Full-waveform Deep Residual Network, FDRN) is proposed in this paper.
Detection of early stage dental caries using near infrared spatial frequency domain imaging
Authors: Bounds Alistair D. , Girkin John M.
Published: November 2021

Only 30% of dental caries are detected early enough for restorative remineralization treatments. Here, we present a near infrared spatial frequency domain imaging system that can detect and quantitatively assess early-stage dental caries.
NeuroSWARM3: Injectable Electro-Plasmonic Nanosensors for Wireless Recording of the Brain Activity
Authors: Hardy Neil , Habib Ahsan , Ivanov Tanya , Yanik Ahmet A.
Published: November 2021

We introduce a Neurophotonic Solution-dispersible Wireless Activity Reporter for Massively Multiplexed Measurements (NeuroSWARM3) for brain activity recording. NeuroSWARM3 allows detection of the electrophysiological signals from deep tissue without physical contact using infrared light.
Imaging chemical environments and amyloid architectures using single-molecule orientation-localization microscopy
Authors: Ding Tianben , Lu Jin , Wu Tingting , Lew Matthew D.
Published: November 2021

We demonstrate various point spread functions that produce superior performance for single-molecule orientation-localization microscopy. These orientation “spectra” reveal chemical environments and amyloid architectures that cannot be visualized using traditional super-resolution microscopy.
Compressed Sensing and Shape Extraction with Vortex Singularities
Authors: Vuong Luat T.
Published: November 2021

Photonics-based compressed sensing and shape extraction may aid pattern recognition and build intuition for image processing in hybrid vision systems. When an illuminating vortex illuminates an aperture with similar geometry, power flows towards the singularity.
Hyperspectral imaging system for evaluating the stress field in digital photoelasticity
Authors: León Juan Briñez-de , Fandiño-Toro Hermes , Torres-Madroñero María , Restrepo-Martínez Alejandro
Published: November 2021

A limitation for developing real-time stress evaluation in digital photoelas- ticity relies on the multiple acquisitions required and complicated algorithms for fringe demodulation. This paper proposes a hyper-spectral imaging system as a solution of such drawbacks.
Athermal Travelling Wave Mach-Zehnder Modulators for Optical Interconnects
Authors: De Souvaraj , Das Ranjan , Kleine-Ostmann Thomas , Schneider Thomas
Published: November 2021

We design a PN junction-based Travelling Wave Mach-Zehnder modulator with an air- filled deep trench region to enhance the electro-optic bandwidth. A data rate up to 50 Gbps has been achieved without deploying any pre-compensation.
Multi-dimensional EDFA Gain Spectrum Optimization for Increasing WDM System Capacity
Authors: Zhang Yihao , Liu Xiaomin , Qiu Qizhi , Liu Yichen , Chen Minggang , Yi Lilin , Hu Weisheng , Zhuge Qunbi
Published: November 2021

A multi-dimensional EDFA gain spectrum optimization scheme based on the penalty method with gradient descent is proposed to increase the capacity of a WDM system. A gain of 5.47% on capacity is achieved in simulations.
Bayesian Optimization-Based Algorithm to Improve the Quality of Transmission Estimation
Authors: Ayassi Reda , Triki Ahmed , Laye Maxime , Le Rouzic Esther , Crespi Noel , Minerva Roberto
Published: November 2021

We propose a Bayesian Optimization-based algorithm to assess the optical parameters that are taken as input by the QoT computation tool. The method reduces the error in computed OSNR down to 0.07dB.
Dynamic Modulation Format and Wavelength Assignment in Optical Networks using Reinforcement Learning
Authors: Freire-Hermelo Maria , Lavignotte Antoine , Lepers Catherine
Published: November 2021

In this paper, we present the strategy we have adopted to reduce the adding or dropping channel blocking probability using reinforcement learning in comparison with other methods. We demonstrate 27 % reduction with 40 % channel load.
Flexible Converged Photonic and Radio Systems: A Pathway toward Next Generation Wireless Connectivity
Authors: Browning Colm , Dass Devika
Published: November 2021

The development of ultra-dense mobile networks is contingent on effective co-design of optical and wireless systems. This work proposes the convergence of emerging photonic/radio technologies to form a platform for future wireless communications.
Benchmarking Packet-Granular OCS Network Scheduling for Data Center Traffic Traces
Authors: Benjamin Joshua L. , Parsonson Christopher W. F. , Zervas Georgios
Published: November 2021

We recently reported hardware-implemented scheduling processors for packet-granular reconfigurable optical circuit-switched networks. Here, we benchmark the performance of the processors under various data center traffic for a range of network loads.
Double-layered Halide Architecture Mixed Perovskite Solar Cell probed by Ultrafast Transient Absorption Spectroscopy
Authors: Chan Ching-Wen , Singh Mriganka , Ho I-Hung , Ahn Hyeyoung , Guo Tzung-Fang , Chu Chih-Wei , Lu Yu-Jung
Published: November 2021

We studied the charge-carrier dynamics in double-layered halide architecture mixed perovskite by pump-probe transient absorption spectroscopy. The excited state absorption shows a 32 times faster electron injection rate in this structure.
Magneto-optic Modulator Fabricated Using Polymer-Coated Magnetic Nanoparticles with 4.75dB Extinction Ratio
Authors: Jenkins Shelbi L. , Carothers Kyle , Showghi Sasaan A. , Pyun Jeffrey , Norwood Robert A.
Published: November 2021

By integrating high-Verdet polymer-coated magnetic nanoparticles onto high-Q Si3N4 microring resonators, we have successfully demonstrated preliminary proof-of-concept for a magneto-optic (MO) modulator with extinction ratios up to 4.75dB for on-resonance wavelength positions.
Funnelling spontaneous emission into waveguides via hyperbolic metamaterials
Authors: Channab M. , Lupi F. Ferrarese , Murataj I. , Pirri F. , Angelini A.
Published: November 2021

We propose an efficient way to couple spontaneous emission of an electric dipole to an in-plane waveguide by taking advantage of the enhanced lateral mission provided by properly designed hyperbolic metamaterial.
X-ray Radioluminescent Crystalline Colloidal Arrays Composed of Terpolymer Nanoparticles
Authors: Jones Haley W. , Bandera Yuriy , Foulger Stephen H.
Published: November 2021

X-ray active, terpolymer nanospheres are fabricated by copolymerizing styrene, propargyl acrylate, and anthracene methyl methacrylate. The strong Coulombic forces between particles induce spontaneous self-assembly into a crystalline colloidal array.
Single-mode all-dielectric optical cavities in second-order topological metamaterials
Authors: Košata Jan , Zilberberg Oded
Published: November 2021

We introduce a scheme to create 0D in-gap topological modes in patterned all-dielectric 2D metamaterials, presenting analytical and numerical results and generalizing to a broad range of lattice structures.
Robust Flat Optics for Broadband Light Control on Flexible Substrates
Authors: Burguete-Lopez Arturo , Makarenko Maksim , Wang Qizhou , Getman Fedor , Fratalocchi Andrea
Published: November 2021

We present a platform for the inverse design of flat optics that are robust to fabrication errors and mechanical deformation. Experimentally, we show flexible polarizers that maintain 80% efficiency when curved over a 200 nm bandwidth.
Broadband bandpass THz filters with stacked metasurfaces
Authors: Maleki Ali , Jaber Ahmed , Singh Avinash , Xin Yongbao , Guay Jean-Michel , Reshef Orad , Dolgaleva Ksenia , Boyd Robert W. , Sullivan Brian , Ménard Jean-Michel
Published: November 2021

We present a stacked metasurface device with broad bandpass filtering properties in the terahertz region. The design, optimized with numerical simulations and characterized experimentally, features high transmission over a >1 THz spectral range.
Strain Induced Exciton Absorption Shift WS2 Monolayer Integrated Photodetector
Authors: Patil Chandraman , Maiti R. , Dalir Hamed , Sorger Volker J.
Published: November 2021

We demonstrate the effect of local non-homogeneous strain on WS2 monolayer integrated on a SiN photonic waveguide showing a strong spectral responsivity (80mA/W) at exciton wavelength (620nm) and shift of ~10nm in photodetector device.
Impedance matching to epsilon-near-zero media by free space excitation of low momentum SPPs
Authors: Johns Ben
Published: November 2021

Epsilon-near-zero media suffer from large impedance mismatch with free space, making it difficult to effectively couple in light. We show that impedance matching can be achieved by direct excitation of low momentum SPPs at an ENZ-metal interface.
Ultrathin planar resonant cavities with refractive index below unity
Authors: Johns Ben , Mitra J.
Published: November 2021

Highly reflecting substrates prevent interference resonances in overlaid films thinner than a quarter-wavelength. This limitation is overcome using media of refractive index below unity, resulting in strong interferences and near-perfect absorption.
APPLICATIONS and INTEGRATION OF METASURFACES
Authors: Genevet Patrice
Published: November 2021

Metasurfaces offer complete control of optical wavefront, such as phase, amplitude and polarization at the subwavelength scale, enabling a new class of artificial two-dimensional optics. Metasurfaces hold great potential in on-chip optoelectronic integration applications, which will significantly promote the development of miniaturized optoelectronic systems. In this presentation, i will review our group results on Metasurfaces integration in VCSEL and new results on vectorial holography and LiDARs.
Silicon rich silicon nitride for efficient thermo-optic switches
Authors: Nejadriahi Hani , Pappert Steve , Fainman Yeshaiahu , Yu Paul
Published: November 2021

We demonstrate low loss ultra-compact bends in PECVD silicon rich silicon nitride and utilize them towards realizing efficient thermo-optic MMI switches with Pπ = 23 mW and a footprint of 68 x 68 µm2.
Comparison of Leakage Loss in Silica, Chalcogenide, Tellurite, and ZBLAN Negative Curvature Fibers
Authors: Wei Chengli , Menyuk Curtis R. , Hu Jonathan
Published: November 2021

We computationally study leakage loss in negative curvature fibers made with silica, chalcogenide, tellurite, and ZBLAN glasses. Fibers with different glasses should be adopted for applications in different wavelengths.
HPCVD of ZnSxSe1–x Claddings for ZnSe Optical Fibers
Authors: Coco Michael G. , Sparks Justin R. , Aro Stephen C. , Hendrickson Alexander , Krug James P. , McDaniel Sean A. , Cook Gary , Sazio Pier J. , Gopalan Venkatraman , Badding John V.
Published: November 2021

HPCVD ZnSe optical fibers support hundreds to thousands of modes because they lack an appropriate cladding layer. Here, we demonstrate HPCVD deposited ZnSxSe1–x claddings to tune the number of supported modes.
High Dimensional Quantum Light Source with Meta-lens Array
Authors: Liu Xiaoyuan , Chen Mu Ku , Wu Yongfeng , Zhang Jingcheng , Yan Yue , Yuan Jiaqi , Zhang Zhengnan , Tsai Din Ping
Published: November 2021

We demonstrate a 100-path entangled photon-pair source by integrating a meta-lens array with a nonlinear crystal, which shows promise for quantum-optical technologies with high-dimensional entanglement and multiphoton-state generation.
Giant Third-Harmonic Dichroism Driven by Quasi-BIC in Chiral All-Dielectric Metasurfaces
Authors: Gandolfi M. , Tognazzi A. , Rocco D. , De Angelis C. , Carletti L.
Published: November 2021

We develop a new approach based on quasi-BICs to develop chiral metasurfaces exhibiting nonlinear circular dichroism (up to 99.9%) and high conversion efficiency. Tuning mode interference allows selective linear and nonlinear circular dichroism.
Multi-wavelength branched flow of light
Authors: Lee Seungsu , Kim Hansol , Jeong Yoonchan
Published: November 2021

Branched flow is a natural wave phenomenon with the beam diving into multiple narrow, collimated beams. We observe the optical branched flow of multi-wavelength light inside a soap membrane with a supercontinuum light source.
Superfluorescent Virus-like Particles
Authors: Dragnea Bogdan
Published: November 2021

After short pulse excitation, the optical emission from a dense array of fluorophores attached onto the surface of an icosahedral virus is strongly accelerated. Here we review the circumstances in which this intriguing phenomenon can be observed.
CdSiP2 based mid-infrared optical parametric sources pumped with Raman fiber amplifiers
Authors: Murray R. T. , Chandran A. M. , Battle R. A. , Runcorn T. H. , Schunemann P. G. , Zawilski K. T. , Guha S. , Taylor J. R.
Published: November 2021

CdSiP2 (CSP) is a nonlinear optical semiconductor which can phasematch pump wavelengths throughout the near-infrared (NIR) to generate mid-infrared (MIR) light through parametric three-wave mixing. In this work, we investigate the unique combination of NIR Raman fiber amplifiers around 1.24 µm and non-critical phasematching in CSP, to demonstrate tunable sources in the 4-5 µm MIR region.
A Thulium-Doped Tantalum Pentoxide Waveguide Laser
Authors: Mitchell Colin J , Tong Amy SK , Sessions Neil P , Wilkinson James S , Mackenzie Jacob I
Published: November 2021

Tm-doped Ta2O5 films, deposited on thermally oxidized silicon substrates, were etched to form rib waveguides. Optically pumped (793 nm) multimode lasing at 1.9 µm is demonstrated from bare facets, producing 24-mW output, 46% slope efficiency.
Improvement of Multiple GaAs Plate-stacked Quasi-phase-matching Mid-infrared Wavelength-conversion Devices Fabricated With Room-temperature Bonding
Authors: Takahashi Yuki , Tanimoto Rika , Kawai Chokutaro , Nakazumi Atsuhiro , Shoji Ichiro
Published: November 2021

Improved room-temperature-bonding process enables us to reduce the internal scattering loss of a quasi-phase-matching stack of 25 GaAs plates. This is accomplished by setting GaAs plates on YAG crystals with laser-grade flat surfaces.
Liquid immersion enables 3D-printing of diffractive optical elements
Authors: Orange-Kedem Reut , Nehme Elias , Weiss Lucien E. , Ferdman Boris , Alalouf Onit , Opatovski Nadav , Shechtman Yoav
Published: November 2021

We show that immersing a diffractive optical element (DOE) in a near-index-matched solution significantly simplifies its fabrication process thanks to scaling-up of its axial dimensions, enabling adaptable and 3D printable DOEs.
Single-shot tomographic microscopy for fast 3D cellular imaging
Authors: Ge Baoliang , Deng Mo , He Yanping , Wang Yijin , Rahman Md Habibur , Ho Yi-Ping , Duan Liting , Yaqoob Zahid , Barbastathis George , So Peter T. C. , Zhou Renjie
Published: November 2021

We propose a single-shot 3D cell imaging method with unprecedented sub-millisecond temporal resolution and diffraction-limited spatial resolution. This method is based on an angle-multiplexed illumination interferometric imaging system and a deep-learning 3D image reconstruction model.
Practical Improvements Into the Fourier Ptychographic Microscopy Reconstruction Path
Authors: Rogalski Mikołaj , Zdańkowski Piotr , Trusiak Maciej
Published: November 2021

We propose four modifications into the Fourier ptychographic microscopy, making it more useful and practical via faster reconstruction robust to data and imaging systems imperfections.
Adaptive Optics Light-Sheet Microscopy For Functional Neuroimaging
Authors: Hubert Antoine , Harms Fabrice , Imperato Sophia , Loriette Vincent , Veilly Cynthia , Levecq Xavier , Farkouh Georges , Rouyer François , Fragola Alexandra
Published: November 2021

We present a novel implementation of extended-scene adaptive optics for light-sheet microscopy based on direct wavefront sensing for fast aberration correction. We report AO-enhanced functional images of GCaMP neurons in the live drosophila brain.
Structured Light Sheet Microscopy for High Contrast 3D Imaging of Whole Mouse Brain
Authors: Frantz David , Karamahmutoglu Tugba , Kirik Deniz , Berrocal Edouard
Published: November 2021

Tissue clearing allows 3D-imaging of large biomedical samples, but can be affected by blur effects limiting individual cells detection. Using a structured illumination light sheet we solve this issue, obtaining high-contrast images in turbid samples.
Plasmon-enhanced Raman microscopy of cell membrane molecules
Authors: Lee Hongki , Kang Kyungnam , Mochizuki Kentaro , Lee Changhun , Yoo Hajun , Rhee Woo Joong , Moon Gwiyeong , Toh Kar-Ann , Lee Seung Ah , Fujita Katsumasa , Shin Jeon-Soo , Kim Donghyun
Published: November 2021

We investigated super-localized measurement of molecular distribution at cell membrane with surface plasmon localization. The plasmonic nanostructures could improve the precision of optical measurement over diffraction-limited microscopy techniques.
Intensity diffraction tomography with a non-paraxial multiple-scattering model
Authors: Zhu Jiabei , Matlock Alex , Wang Hao , Tian Lei
Published: November 2021

We demonstrate a new intensity diffraction tomography reconstruction algorithm based on the split-step non-paraxial method for imaging multiple-scattering biological samples.
Breast Cell Cancer Progression Characterization Through Holographic Cytometry
Authors: Chen Cindy X. , Park Han Sang , Wax Adam
Published: November 2021

We propose to use holographic cytometry to collect high throughput data on flowing tumorigenic and nontumorigenic cells. We aim to characterize different cell lines using machine learning and morphological parameters analysis.
Label-Free Confocal iSCAT Microscopy on Live Cells
Authors: Küppers Michelle , Albrecht David , Kashkanova Anna , Lühr Jennifer , Sandoghdar Vahid
Published: November 2021

Confocal interferometric scattering microscopy (iSCAT) enables the label-free visualization of cellular organelles and tracking of nanoscopic matter such as intracellular vesicles and viruses.
Voltage Dependent Nematic Liquid Crystals for Quantitative Fourier Phase Contrast Microscopy
Authors: Kyeremah Charlotte , La Jeffrey , Gharbi Mohamed , Yelleswarapu Chandra S
Published: November 2021

We present a quantitative phase microscopy technique by combining Fourier phase contrast microscopy with voltage-dependent orientation of various liquid crystal textures and phase shifting interferometry and investigated the contrast of phase images.
Phase retrieval with data-driven dual alternating direction method of multipliers for coherent diffraction imaging
Authors: Song Li , Lam Edmund Y.
Published: November 2021

A learning-based dual alternating direction method of multipliers is proposed to solve the phase retrieval problem. Numerical simulations of the coded holographic coherent diffraction imaging system show the efficiency of proposed method.
Multimodal FACED imaging flow cytometry for correlative single-cell morphological analysis
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: November 2021

We report a high-throughput multimodal imaging flow cytometer for biophysical and morphological analysis of cell cycle progression at single-cell precision with molecular specificity (at >10,000 cells/sec).
Enhancing contrast of in-vivo human retinal ganglion cells with multi-offset adaptive optics scanning laser ophthalmoscope
Authors: Gofas-Salas Elena , Rui Yuhua , Mecê Pedro , Zhang Min , Snyder Valerie C. , Vienola Kari V. , Lee Daniel , Sahel José-Alain , Grieve Kate , Rossi Ethan A.
Published: November 2021

We implement a new adaptive optics scanning laser ophthalmoscope detection path revealing human retinal ganglions with contrast and acquisition time suitable for clinical diagnosis obtaining similar results to what was previously achieved on monkeys.
Development of a clinical coherent Raman imaging system for in vivo drug monitoring
Authors: Pence Isaac J. , Goss Avery , Fast Alexander , Brinkmann Maximilian , Hellwig Tim , Fallnich Carsten , Evans Conor L.
Published: November 2021

We present the development of a clinical, cart-based coherent Raman imaging system utilizing a rapidly-tuning all-fiber light source and integrated fiber optic detection for video-rate imaging of topical drug delivery and quantification in human skin.
Photonic-chip: a multimodal imaging tool for histopathology
Authors: Villegas-Hernández Luis E. , Dubey Vishesh K. , Tinguely Jean-Claude , Coucheron David A. , Priyadarshi Anish , Acuña-Maldonado Sebastián A. , Agarwal Krishna , Mateos José M. , Nystad Mona , Hovd Aud-Malin Karlsson , Fenton Kristin A. , Ahluwalia Balpreet S.
Published: November 2021

We propose the photonic-chip as a multimodal imaging platform for histopathological assessment, allowing large fields-of-view across diverse microscopy methods including total internal reflection fluorescence and single-molecule localization.
OpenSTED: Inexpensive and open-source implementation of Dynamic Intensity Minimum (DyMIN) for Stimulated Emission Depletion (STED) microscopy
Authors: Meyer Stephanie A. , Siemens Mark E. , Gopinath Juliet T. , Restrepo Diego , Gibson Emily A.
Published: November 2021

The DyMIN method reduces photobleaching, a problem in STED microscopy. Labs implementing custom-built STED microscopes would greatly benefit from DyMIN capabilities. We present an inexpensive, open-source version utilizing an FPGA and multiplexer.
Circumventing The Optical Diffraction Limit Using Customized Speckles
Authors: Bender Nicholas , Sun Mengyuan , Yılmaz Hasan , Bewersdorf Joerg , Cao Hui
Published: November 2021

We utilize tailored speckle patterns for parallelized nonlinear pattern-illumination microscopy: based on fluorescence photoswitching. In our proof-of-principle experiment, we obtain a spatial resolution 3X higher than the diffraction limit.
Metamaterial Assisted Speckle Illumination Nanoscopy for High-resolution Biological Imaging
Authors: Zhao Junxiang , Lee Yeon Ui , Ma Qian , Khorashad Larousse Khosravi , Posner Clara , Li Guangru , Bimananda G. , Wisna M. , Burns Zachary , Zhang Jin , Liu Zhaowei
Published: November 2021

We developed a wide field of view super resolution microscopy technology, i.e. speckle metamaterial-assisted illumination nanoscopy (speckle-MAIN), showing biological imaging with resolution down to 40nm.
High-resolution dynamic imaging system based on a 2D optical phased array
Authors: Wang Zihao , Sun Yanling , Liao Jiali , Wang Chen , Cao Rui , JIn Li , Cao Changqing
Published: November 2021

We propose an imaging system with scanning feedback of an optical phased array (OPA) for moving targets with unknown speed. The system combines OPA scanning velocimetry capability with OPA-based ghost imaging to enable trajectory tracking of targets moving within the field-of-view of the system while accomplishing image reconstruction. The proposed system can perform image reconstruction for millimeter-scale moving targets placed up to 20 m away from the camera. The system can be applied in areas such as autonomous driving and high-resolution imaging.
Experimental demonstrations of DSP-enabled flexibility, adaptability and elasticity of multi-channel >72Gb/s over 25 km IMDD transmission systems
Authors: Jin W. , Zhong Z. Q. , Jiang S. , He J. X. , Hu S. H. , Chang D. , Giddings R. P. , Hong Y. H. , Jin X. Q. , O’Sullivan M. , Durrant T. , Trewern J. , Mariani G. , Tang J. M.
Published: November 2021

DSP-enabled multi-channel aggregation techniques are promising for cost-effectively improving the flexibility, adaptability and elasticity of fronthaul transport networks. By utilizing orthogonal digital filtering in multi-channel aggregation in IMDD transmission systems, two DSP-enabled matching filter (MF)-free multi-channel aggregation techniques respectively based on SSB OFDM and orthogonal DSB OFDM have been reported; however, the SSB (DSB) technique has a drawback of relatively high digital filter DSP complexity (reduced adaptability to physical layer system characteristics). To effectively overcome these drawbacks associated with these two techniques, in this paper, a DSP-enabled MF-free adaptively variable SSB/DSB OFDM multi-channel aggregation technique is proposed and experimentally demonstrated, in which >72Gb/s@25 km IMDD transmissions have been achieved. This work also evaluates, for the first time, the flexibility, adaptability, and elasticity of the orthogonal digital filtering-enabled multi-channel aggregation techniques. The results show that the proposed technique not only maintains the SSB technique’s excellent adaptability but also possesses the DSB technique’s low digital filter DSP complexity features.
Short-wavelength infrared (SWIR) photodetector based on multi-layer 2D GaGeTe
Authors: Tamalampudi Srinivasa R. , Dushaq Ghada , Villegas Juan E. , Rajput Nitul S. , Paredes Bruna , Elamurugu Elangovan , Rasras Mahmoud S.
Published: November 2021

Recent theoretical studies proposed that two-dimensional (2D) GaGeTe crystals have promising high detection sensitivity at infrared wavelengths and can offer ultra-fast operation. This can be attributed to their small optical bandgap and high carrier mobility. However, experimental studies on GaGeTe in the infrared region are lacking and this exciting property has not been explored yet. In this work, we demonstrate a short-wavelength infrared (SWIR) photodetector based on a multilayer (ML) GaGeTe field-effect transistor (FET). Fabricated devices show a p-type behavior at room temperature with a hole field-effect mobility of 8.6 - 20 cm2 V-1s-1. Notably, under 1310 nm illumination, the photo responsivities and noise equivalent power of the detectors with 65 nm flake thickness can reach up to 57 A/W and 0.1 nW/Hz1/2, respectively, at a drain-source bias (Vds) = 2 V. The frequency responses of the photodetectors were also measured with a 1310 nm intensity-modulated light. Devices exhibit a response up to 100 MHz with a 3dB cut-off frequency of 0.9 MHz. Furthermore, we also tested the dependence of the device frequency response on the applied bias and gate voltages. These early experimental findings stimulate the potential use of multilayer GaGeTe for highly sensitive and ultrafast photodetection applications.
Integration of a PQ:PMMA holographic memory device into the hybrid opto-electronic correlator for shift, scale, and rotation invariant target recognition
Authors: Gamboa Julian , Hamidfar Tabassom , Shahriar Selim M.
Published: November 2021

The hybrid optoelectronic correlator (HOC) combines optical and electronic signal processing to achieve the same functionality as traditional optical correlators but without the need for dynamic materials. Here we propose and demonstrate the integration of a PQ:PMMA holographic memory device (HMD) into the HOC as a high-speed all-optical database for reference images. Using a PQ:PMMA HMD for one of the inputs eliminates one of the key speed limitations in the HOC. The observed correlation signal agrees with simulations but highlights the need for high quality holographic substrates in this application.
Surface and volume phonon polaritons in a uniaxial hyperbolic material: optic axis parallel versus perpendicular to the surface
Authors: Su Chengshuai , Fu Ceji
Published: November 2021

Uniaxial hyperbolic materials enable excitation of phonon polaritons with utrahigh wavevectors that have been shown to be promising for many optical and thermal radiative applications and thus have attracted much attention recently. However, the characteristics of surface and volume phonon polaritons excited with uniaxial hyperbolic materials that exhibit in-plane anisotropy or in-plane isotropy have not been discussed thoroughly and some issues have so far remained elusive. In this paper, we conducted a comprehensive investigation on surface and volume phonon polaritons in a bulk or a thin slab of hexagonal boron nitride (hBN). We clarified the excitation, characteristics and topology of surface and volume phonon polaritons in such a uniaxial hyperbolic material. In particular, we showed that hyperbolic surface phonon polaritons (HSPhPs) can exist in the Type I hyperbolic band of hBN with confined wavevectors when the optic axis (OA) is parallel to the surface. For a thin hBN slab, we revealed a split of HSPhPs and a smooth transition between HSPhPs and HVPhPs in the Type II hyperbolic band. Furthermore, we also identified non-Dyakonov surface phonon polaritons excited without evanescent ordinary waves. These findings may extend the understanding of phonon polaritons in hyperbolic materials and offer new theoretical guidance for the design of infrared optical devices with hyperbolic materials.
SWCNT-SA mode-locked Tm,Ho:LCLNGG laser
Authors: Pan Zhongben , Wang Li , Bae Ji Eun , Rotermund Fabian , Wang Yicheng , Zhao Yongguang , Loiko Pavel , Mateos Xavier , Griebner Uwe , Petrov Valentin , Chen Weidong
Published: November 2021

Sub-100 fs pulse generation from a passively mode-locked Tm,Ho-codoped cubic multicomponent disordered garnet laser at ∼2 µm is demonstrated. A single-walled carbon nanotube saturable absorber is implemented to initiate and stabilize the soliton mode-locking. The Tm,Ho:LCLNGG (lanthanum calcium lithium niobium gallium garnet) laser generated pulses as short as 63 fs at a central wavelength of 2072.7 nm with an average output power of 63 mW at a pulse repetition rate of ∼102.5 MHz. Higher average output power of 121 mW was obtained at the expense of longer pulse duration (96 fs) at 2067.6 nm using higher output coupling. To the best of our knowledge, this is the first report on mode-locked operation of the Tm,Ho:LCLNGG crystal.
Artificial neural networks for distributed optical fiber sensing (Invited)
Authors: Liehr Sascha
Published: November 2021

In recent years, artificial neural networks (ANNs) have been increasingly used to enhance the performance of optical fiber sensors for the distributed measurement of strain and temperature. This paper reviews ANN-based approaches for improved and accelerated raw data processing, denoising, as well as higher-level tasks such as event recognition and classification.
Measurement of Propagation Constants of Graded Index Multi-mode Fiber Using Rayleigh Backscattered Light
Authors: Dallachiesa Lauren , Veronese Riccardo , Fontaine Nicolas , Mazur Mikael , Chen Haoshuo , Ryf Roland , Palmieri Luca , Bigot Marianne , Sillard Pierre
Published: November 2021

We measure the distributed differential group delay and effective refractive index difference between all 9 mode groups of a graded index multi-mode fiber using optical frequency domain reflectometry by cross correlating Raleigh backscatter signals.
Estimating Quality of Transmission in a Live Production Network using Machine Learning
Authors: Müller Jasper , Fehenberger Tobias , Patri Sai Kireet , Kaeval Kaida , Griesser Helmut , Tikas Marko , Elbers Jörg-Peter
Published: November 2021

We demonstrate QoT estimation in a live network utilizing neural networks trained on synthetic data spanning a large parameter space. The ML-model predicts the measured lightpath performance with <0.5dB SNR error over a wide configuration range.
Interrogation of fiber Bragg grating sensors based on dispersion spectroscopy with optical frequency combs
Authors: Poiana Dragos A. , Posada-Román Julio E. , García-Souto Jose A.
Published: November 2021

In this paper an all-fiber compact fiber Bragg grating (FBG) interrogation system is presented. Instead of using the absorption profile of the FBG sensor to obtain the Bragg wavelength, we propose the readout of the FBG dispersion profile. The interrogation is done with an optical frequency comb based on dual-electro-optic modulators for compactness and stability, that can be exploited on site the applications.
Remote Vapor Magnetometer Detection Scheme
Authors: Lou Janet W. , Frigo Nicholas J. , Cranch Geoffrey A.
Published: November 2021

A passive detection scheme enabling single fiber remote operation of an optically pumped magnetometer is demonstrated. Polarization analysis occurs at the sensor head, while the Larmor precession frequency is detected after fiber propagation.
Optical fiber probes for trapping and backscattered signal analysis of sub-µm particles
Authors: Rodrigues S. M. , Paiva J. S. , Silva F. M. , Coelho L. , Marques P. V. S. , Cunha J. P. S. , Jorge P. A. S.
Published: November 2021

Optical tweezers based on metallic-coated tapered optical fibers with an aperture at the apex are fabricated and their sensing ability is tested. Preliminary results show robustness in differentiating between a trapped and no trapped state.
Comparison of all-grating fiber and enhanced backscatter fiber for distributed strain sensing
Authors: Hart Joseph D. , Hutchinson Meredith N. , Cranch Geoffrey A.
Published: November 2021

We investigate the limits of distributed strain sensing using all-grating fiber. We find that the sensing range is limited by the oft-neglected autocorrelation of the impulse response in addition to the Born approximation. Enhanced backscatter fiber increases the sensing range at the cost of spatial resolution and measurement speed.
High Spatial Resolution Opto-mechanical time-domain analysis
Authors: Dong Yongkang , Pang Chao , Bao Xiaoyi
Published: November 2021

We propose a novel opto-mechanical time-domain analysis based on coherent forward stimulated Brillouin scattering probing, and demonstrate a 2-meter spatial resolution over a 225- meter-long fiber in which we are able to distinguish air from alcohol.
Spatially continuous sensing of fiber curvature over sub millimeter lengths with a twisted multicore optical fiber
Authors: Ahmad Raja , Ko Wing , Westbrook Paul S. , Feder Kenneth S.
Published: November 2021

Using a twisted multicore optical fiber, we demonstrate the detection of distributed fiber curvature on a textured surface exhibiting a sinusoidal profile with a micron-scale amplitude and a sub-millimeter spatial period.
Real-time phase-recording DAS in 171 km low-loss fiber
Authors: Waagaard Ole Henrik , Rønnekleiv Erlend , Haukanes Aksel , Stabo-Eeg Frantz , Thingbø Dag , Forbord Stig , Aasen Svein Erik , Brenne Jan Kristoffer
Published: November 2021

We demonstrate sustained real-time phase-recording distributed acoustic sensing (DAS) in 148 km standard SMF28e and 171 km low-loss OFS TeraWave SCUBA 125 fibers without inline amplification. Low noise and high optical dynamic range are obtained by combining swept frequency interrogation and a very low phase noise laser.
Distributed Acoustic Sensors Based on Time-gated Digital Optical Frequency Domain Reflectometry
Authors: He Zuyuan , Liu Qingwen
Published: November 2021

This paper presents a review on distributed acoustic sensors (DAS) based on time-gated digital optical frequency domain reflectometry (TGD-OFDR) that we developed in recent years. Two types of fading-free DAS systems adopting phase demodulation and interference-pattern demodulation are introduced, respectively.
All-optically-driven and All-optical-fiber Vacuum Gauge via Ytterbium-doped Optical Fiber Microheater
Authors: Yu Nanjie , Mironov Andrey E. , Park Sehyun , Tuggle Matthew , Gragg Jane , Kucera Courtney , Hawkins Thomas , Ballato John , Eden J. Gary , Dragic Peter D.
Published: November 2021

A new type of dual-fiber-based thermal vacuum gauge is presented. One heavily-Yb3+- doped luminescence-quenched fiber produces heat, another fiber with inscribed FBG senses the resultant thermal exchange. Performance is characterized from 20 mTorr to Standard Pressure.
Distributed fiber temperature alarm system based on thermodynamic phase transition
Authors: Zhang Li , Yang Fan , Gyger Flavien , Thévenaz Luc
Published: November 2021

A novel temperature sensing mechanism is proposed for the first time, based on thermodynamic phase transitions of CO2 in hollow-core fibers. A f ast, s ensitive and distributed fiber temperature alarm system is demonstrated using this concept.
Quantitative Amplitude Measuring φ-OTDR using a Sequence of Frequency Shifted Pulses
Authors: Redding Brandon , Murray Matthew J.
Published: November 2021

We present a -OTDR sensor that recovers quantitative strain information from the Rayleigh backscattering ϕ amplitude of a sequence of frequency-shifted pulses. This approach allows for higher launch power, enabling low-noise

(
1.3
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dynamic strain sensing.
Compressed quasi-distributed dynamic strain sensing
Authors: Shiloh Lihi , Giryes Raja , Eyal Avishay
Published: November 2021

The dynamic strain between two discrete reflectors in a quasi-DAS φ-OTDR system was successfully measured, although the spatial resolution of the system was insuffi- cient to resolve the reflectors using standard reconstruction and the backscatter profile was randomly sub-sampled. This was achieved with two different Compressed Sensing (CS) techniques whose performances, in terms of SNR and sensitivity, were analyzed in this work. The two methods significantly outperformed conventional processing while using as low as 14% of the original sampled data.
Comprehensive Load-Deflection Analysis of Railway Track based on Distribute Acoustic Sensing
Authors: Masoudi Ali , Milne David , Ferro Edgar , Watson Geoff , Brambilla Gilberto , Le Pen Louis
Published: November 2021

So far, Distribute Acoustic Sensor (DAS) systems have been used for railway condition monitoring using the dark fiber laid next to the track. In this study, the fiber was attached on the rail for in-depth analysis of the rail deflection and the load per sleeper.
Application of Multi Fiber-Sensor Fusion for Enhanced Temperature Measurement Performance
Authors: Lauber Thomas , Lees Gareth
Published: November 2021

We present the fusion of temperature measurements from different distributed fiber sensing technologies, namely Raman-DTS and DAS based DTGS, and its application. The method yields an improvement of factor 3 in temperature resolution compared to DTS only, revealing temperature features otherwise undetectable.
Aqueduct Tunnel Convergence Measurement using a Distributed Optical Fiber Sensor
Authors: Imai Michio , Mizuno Shutaro
Published: November 2021

Convergence measurements are required to confirm the structural integrity of a tunnel; however, such inspections typically interrupt its function. In particular, the inspection of power plant aqueduct tunnels, in which water constantly runs, requires the shutdown of the plant and drainage of the tunnel. The authors accordingly installed an optical fiber sensor around the interior circumference of an aqueduct tunnel to calculate its cross-sectional deformation using the measured strain distribution, realizing real-time and continuous monitoring of tunnel convergence.
Train monitoring using distributed fiber optic acoustic sensing
Authors: Kowarik Stefan , Hicke Konstantin , Chruscicki Sebastian , Schukar Marcus , Breithaupt Mathias , Lämmerhirt Andy , Pohl Patrick , Schubert Max
Published: November 2021

We use distributed acoustic sensing to determine the velocity of trains from train vibration patterns using artificial neural network and conventional algorithms. The velocity uncertainty depends on track conditions, train type and velocity.
3D Printing Technology-enhanced Phase-sensitive OTDR for Underwater Acoustic Wave Detection
Authors: Liu Zhichao , Zhang Liang , Liu Huanhuan , Qiu Zenghuan , Xiao Zhelan , Chen Zhen , Wang Tingyun , Pang Fufei
Published: November 2021

We demonstrated a highly sensitive underwater acoustic wave detection by incorporating 3D-printed sensing elements in phase-sensitive Optical Time Domain Reflectometry (φ-OTDR), giving rise to one-order of magnitude enhanced signal-to-noise ratio (SNR).
Hybrid Distributed Acoustic-Temperature Sensor Using a Multimode Fiber
Authors: Mao Yuan , Ashry Islam , Hveding Frode , Bukhamseen Ahmed Y. , Ng Tien Khee , Ooi Boon S.
Published: November 2021

We report on simultaneous measurements of vibration and temperature along a multimode fiber (MMF). The MMF operates in a quasi-single-mode (QSM) state to satisfy the operational requirements of the distributed acoustic and temperature sensing systems.
A Distributed Strain Measurement Method for Ultra-high Voltage GIL Spacer Based on OFDR and All Grating Fiber
Authors: Qin Weiqi , Zhang Meng , Xu Ce , Wang Yuan , Zhou Hongyang , Ma Guoming
Published: November 2021

We proposed a high-resolution distributed strain measurement method for ultra-high voltage GIL spacers based on OFDR. Hydrostatic tests were conducted and the strain distributions were measured with all grating fiber stuck on a 1000 kV spacer.
D-shaped multicore fibre and its application in curvature monitoring with Brillouin Optical Time-Domain Reflectometry
Authors: Zafeiropoulou Angeliki , Masoudi Ali , Zdagkas Apostolos , Cooper Laurence , Brambilla Gilberto
Published: November 2021

A D-shaped 7-core fibre is used for curvature sensing with a Brillouin Optical Time-Domain Reflectometry setup. The preferential bending of the D-shaped fibre, com- pensates for its twist, eliminating the need for manually correcting the fibre’s position.