bluuebunny/crossref_metadata_2025 huggingface dataset:
Solving Inverse Problems using Self-Supervised Deep Neural Nets
Authors: Liu Jiapeng , Balaji Muralidhar M. , Metzler Christopher A. , Asif M. Salman , Rangarajan Prasanna
Published: November 2021

A modular framework combining the expressive power of generative models with physics-assisted learning is proposed to solve inverse problems. The process is iterative, unsupervised, and only requires knowledge of the physical/forward model.
Shift-Variant Deblurring for Rotationally Symmetric Systems
Authors: Kohli Amit , Angelopoulos Anastasios , You Sixian , Waller Laura
Published: November 2021

We present a fast image deblurring method for rotationally symmetric systems with spatially-varying aberrations. We calibrate our method with point spread function measurements along a line. Our method outperforms standard deconvolution on the UCLA Miniscope.
Randomized Probe Imaging through Deep K-Learning
Authors: Guo Zhen , Levitan Abraham , Barbastathis George , Comin Riccardo
Published: November 2021

Iterative phase retrieval algorithms are time-consuming. To accelerate reconstructions for Randomized Probe Imaging (RPI), we propose deep k-learning, a neural network with attention to frequency. The associated computational speedup may enable fast dynamical imaging.
Effect of Limited Phase Shift on Single-Pixel Imaging using Carrier-Depletion Silicon Photonic Phased Array
Authors: Emara Samar , Fukui Taichiro , Komatsu Kento , Kohno Yusuke , Tanemura Takuo , Nakano Yoshiaki
Published: November 2021

We experimentally demonstrate single-pixel imaging using a carrier-depletion silicon optical phased array and reveal that high-quality images can be obtained even with a limited phase shift. This tapers off the device requirement for high-speed imaging.
Information theoretic study on x-ray imaging of integrated circuits in a low photon budget
Authors: Song Jungki , Levine Zachary H. , Alpert Bradley K. , Glinsky Michael E. , Fowler Joseph W. , Barbastathis George
Published: November 2021

Physics-aware machine learning (PAML) has proven to be successful in re- trieving object in a low-photon imaging condition. In this study, we take an information theoretic approach to study maximum amount of information (i.e., the imaging capacity) that can be reliably retrieved under photon-starved imaging condition. We formulate a sim- ple problem to derive the imaging capacity using Monte Carlo approach: small integrated circuit objects (made out of two different type of materials) imaged with monochromatic x-rays. The simple problem is useful in that the entropies for priors and measurements can be explicitly computed. It is a simple version of the imaging system proposed in Ref. [3]. The constructed problem will help us understand the limit on photon budget, information gain associated with varying number of scan angles, and optimal PAML algorithm that can approach the theoretic imaging capacity.
Hong-Ou-Mandel Enabled 3D Quantum Microscopy
Authors: Ndagano Bienvenu , Defienne Hugo , Lyons Ashley , Faccio Daniele
Published: November 2021

We demonstrate micron-scale lateral and depth resolution imaging microscopy using photon bunching via HOM interference. 3D images are obtained without scanning using a SPAD camera and depth information is retrieved from two-photon coincidence events.
High-speed Fourier ptychography utilizing multiple-cameras and LED multiplexing
Authors: Aidukas Tomas , Konda Pavan C. , Harvey Andrew R.
Published: November 2021

We present a new high-speed Fourier ptychographic imaging technique using multiple-cameras and LED multiplexing. With our technique even the fastest LED multiplexed implementations can be further sped-up by at-least one order of magnitude.
Information Theory Analysis of Space-time Measurements and the Limits of Diffuse Imaging.
Authors: Radford Jack , Faccio Daniele
Published: November 2021

Using information theory, we show the existence of independent information in spatially-resolved photon time-of-flight measurements through highly diffuse materials well beyond 100 transport mean free paths.
Robust Speckle Interferometers using Subspace Analysis
Authors: Balaji Muralidhar M. , Ahsanullah Danyal , Rangarajan Prasanna
Published: November 2021

A computational approach to circumventing the interferometric stability requirements of speckle interferometers is presented. Analysis and representative results detailing its use in NLoS imaging and 3D imaging are included.
A Low-Cost Solution for 3D Reconstruction of Large-Scale Specular Objects
Authors: Li Yunhao , Yeh Chia-Kai , Xu Bingjie , Schiffers Florian , Walton Marc , Tumblin Jack , Katsaggelos Aggelos , Willomitzer Florian , Cossairt Oliver
Published: November 2021

In this paper, we present a low-cost 3D reconstruction method for large-scale specular objects based on deflectometry. Experiments show that our system reaches high accuracy and meets requirements of the target applications in the cultural heritage preservation.
Multipath temporal echoes for reconstructing spatial scenes
Authors: Kapitany Valentin , Turpin Alex , Radford Jack , Rovelli Davide , Mitchell Kevin , Lyons Ashley , Starshynov Ilya , Faccio Daniele
Published: November 2021

We find evidence that multipath temporal echoes provide significantly more information of a scene than direct reflections, enabling the reconstruction of 3D scenes with a single-pixel detector. This is demonstrated in radio-frequency and acoustic experiments.
aPIE: Angle calibration algorithm for reflection ptychography
Authors: De Beurs Anne C.C. , Loetgering Lars , Herczog Milan , Eikema Kjeld S.E. , Witte Stefan
Published: November 2021

We demonstrate a tilt angle self-calibration technique for reflection mode ptychography. Experiments show accurate angle retrieval and improved image reconstruction, with spatially structured beams outperforming beams with smooth profiles.
Regularization for Undersampled Ptychography
Authors: Shedligeri Prasan , Schiffers Florian , Barutcu Semih , Ruiz Pablo , Katsaggelos Aggelos K. , Cossairt Oliver
Published: November 2021

Ptychography becomes increasingly ill-posed when the overlap between neighboring scan points is reduced, inhibiting the object reconstruction. Here, we discuss and show reconstructions with low-overlap ratios by regularizing with priors such as Total- Variation and Structure-Tensor-Prior.
Dielectric Huygens’ metasurfaces for holographic projection and 3D near-eye displays applications
Authors: Liang Xinan , Song Weitao , Li Shiqiang , Li Dongdong , Paniagua-Domínguez Ramoòn , Yu Yefeng , Lai Keng Heng , Lin Qunying , Xu Xuewu , Zheng Yuanjin , Kuznetsov Arseniy I.
Published: November 2021

Metasurfaces promise great potential in large-viewing-angle holographic 3D display applications due to their full-phase-modulation capability and submicron pixel size. I will present our work on large-scale dielectric metaholograms for Near-Eye-Displays and projection and their future.
Suppressing meta-holographic artifacts by laser coherence tuning
Authors: Eliezer Yaniv , Qu Geyang , Yang Wenhong , Wang Yujie , Yilmaz Hasan , Xiao Shumin , Song Qinghai , Cao Hui
Published: November 2021

Metaholograms suffer from imaging coherent artifacts originating from the electromagnetic cross-talk and defects of nanoscale features. Here, we introduce an effi- cient method to remove the artifacts by precisely fine-tuning the spatial coherence of illu- mination.
Computational see-through screen camera using a holographic waveguide device
Authors: Yamaguchi Masahiro , Tagami Noriyuki , Chen Xiao , Konno Hiroki , Nakamura Tomoya
Published: November 2021

A novel imaging technology in which a see-through screen acts as a camera is proposed based on the optical system using a waveguide holographic optical element and digital image reconstruction.
Dynamic-Contrast Digital Holography with Deep Learning for Cancer Chemotherapy Selection
Authors: Nolte David , An Ran , Turek John
Published: November 2021

Coherence-gated digital holography captures intracellular dynamics in living tumor biopsies through depth-resolved dynamic speckle and fluctuation spectroscopy. Changes in intracellular dynamics have specific Doppler signatures that depend on the applied cancer drugs and the sensitivity of the patient to treatment. A Twin Deep Network (TDN) identifies these signatures in the presence of strong sample-to-sample variance to predict patient response to therapy. Clinical trials of dynamic-contrast digital holography have provided phenotypic profiles for ovarian cancer, for HER2neg breast cancer, and for esophageal cancer. This work provides insight into the value of Deep Learning for advanced data analytics as the volume and variety of data from optics-based assays grows.
Computational multi-wavelength (MW) phase synthesis using CNN
Authors: Bazow B. S. , Phan T. , Raub C. B. , Nehmetallah G.
Published: November 2021

MWDHM provides measurements of the refractive index. However, successive-shot MWDHM is not appropriate for dynamic samples and single-shot MWDHM significantly increases the complexity of the optical setup. Here we consider DL/CNN to obtain simultaneous MW measurements.
Multi-Depth Hologram Generation with Deep Neural Network Using Focal Stacks
Authors: Lee Eunbi , Yoo Dongheon , Lee Juhyun , Lee Byoungho
Published: November 2021

A deep neural network that yields 3D multi-focal hologram is presented. The network takes three focal stacks as inputs and yields corresponding real and imaginary parts of a complex hologram.
Synergetic combination of median filtered images to reduce speckle noise in digital holography (DH) and digital holographic microscopy (DHM)
Authors: Castaneda Raul , Jorge-Garcia-Sucerquia  , Doblas Ana
Published: November 2021

We present a single-shot image processing method to reduce speckle noise mitigating undesired blurring effects in both amplitude and phase reconstructed images. The implementation is based on the average of multiple median filtered images with different kernel size. This approach provides final reconstructed amplitude and phase images with reduced speckle contrast and without penalizing the spatial resolution.
Model Based Iterative Reconstruction with the Tilted Abel Transform
Authors: Champley Kyle , Maddox Brian
Published: November 2021

We discuss the tilted Abel Transform (special case of the X-ray Transform for objects that are cylindrically-symmetric) and its adjoint and how these can be used to develop model-based iterative reconstruction algorithms.
AirNet-SNL: End-to-End Training of Iterative Reconstruction and Deep Neural Network Regularization for Sparse-Data XPCI CT
Authors: Lee Dennis J. , Mulcahy-Stanislawczyk John , Jimenez Edward , West Derek , Goodner Ryan , Epstein Collin
Published: November 2021

We present a deep learning image reconstruction method called AirNet-SNL for sparse view computed tomography. It combines iterative reconstruction and convolutional neural networks with end-to-end training. Our model reduces streak artifacts from filtered back-projection with limited data, and it trains on randomly generated shapes. This work shows promise to generalize learning image reconstruction.
Development of slit projection radiography with 1µm resolution at the Omega Laser Facility
Authors: Allen Cameron H. , Oliver Matthew , Ping Yuan , Divol Laurent , Landen Otto L. , Schoelmerich Markus , Theobald Wolfgang , Döppner Tilo , White Thomas G.
Published: November 2021

We present on the design, use, and alignment procedure of novel 1 µm-wide slits for use in x-ray diffractive radiography of warm dense matter at the Omega Laser Facility at the Laboratory for Laser Energetics.
Descattering and Reconstruction in Multimaterial Polyenergetic X-Ray Tomography Using Local Scatter Models
Authors: McCann M. T. , Pfister L. , Khatiwada A. , Klasky M. L. , Schei J. L. , Ravishankar S.
Published: November 2021

We use local models to estimate and subsequently remove scatter from polyenergetic radiographs of multimaterial objects and a polyenergetic onion peeling approach for reconstruction. Results show improved reconstruction accuracies for scatter-to-direct ratios up to 10×.
Spectral and angular couplers based on multiplexed volume holographic gratings in PTR glass
Authors: Shishova M. V. , Zherdev A. Y. , Odinokov S. B.
Published: November 2021

Multiplexed volume holographic gratings are used as spectral and angular optical couplers for augmented reality displays and high-power laser applications. Paper presents modeling approach and recording experiments to create couplers in photo-thermo-refractive glass.
Inverse-problem-based algorithm for sparse reconstruction of Terahertz off-axis holograms
Authors: Kirkove Murielle , Zhao Yuchen , Georges Marc P.
Published: November 2021

We propose a new inverse-problem-based reconstruction technique to off-axis THz digital holography. The proposed method takes into account the non-uniformity of the reference wavefront and reconstructs the object field as well as the amplitude of the reference field.
Robust autofocus for digital-holographic microscopy
Authors: Fournier Corinne , Brault Dylan , Olivier Thomas , Faure Nicolas , Dixneuf Sophie , Thibon Louis , Méès Loïc , Denis Loïc
Published: November 2021

A new method to achieve autofocus in digital holography is proposed. It is based on the insertion of calibrated objects in the sample and the use of a robust algorithm to locate these objects.
GSURE criterion for unspervised regularized reconstruction in Tomographic Diffractive Microscopy
Authors: Denneulin L. , Momey F. , Brault D.
Published: November 2021

In the context of inverse problems based 3D image reconstruction for tomographic diffractive microscopy, we propose a simulation study for evaluating the potential of the Generalized Stein Unbiased Risk Estimator for automatically tuning the regularization parameters.
Digital Hologram Denoising Using Conditional Generative Adversarial Networks
Authors: Rawat Siddharth , Wang Anna
Published: November 2021

Accurate feature extraction from digitally acquired in-line and off-axis holograms using analytical methods is challenging in the presence of noise. We present a strategy to overcome this limitation by using conditional generative adversarial networks (cGANs).
Multi-wavelength digital holography on a collaborative robot
Authors: Seyler Tobias , Beckmann Tobias , Stevanovic Jonas , Fratz Markus , Bertz Alexander , Carl Daniel
Published: November 2021

Digital holographic measurements on multi-axis systems enable high-precision quality control in machining production. For the first time, we present extensive, stitched, manually selected multiwavelength digital holographic measurement data recorded using a collaborative robot for handling.
Fast reconstruction of off-axis digital holograms
Authors: McKeithen Dylan , Wallace J. Kent
Published: November 2021

Hologram reconstruction via the angular spectrum method utilizes fast Fourier transforms which quickly but inefficiently shift between image and pupil planes. We demonstrate hologram reconstruction using discrete transforms over limited regions, decreasing computation time 10x.
Ptychography with DMD-based complex-valued probe
Authors: Shevkunov Igor , Georgieva Alexandra , Belashov Andrei , Petrov Nikolay V.
Published: November 2021

We propose a new ptychographic algorithm where the object scanning is performed by the complex-valued probe function, formed in the setup of independent amplitude-phase modulation. The results of numerical experiments demonstrate the effectiveness of the proposed approach.
Use of noise reduction techniques for sample rotation tomography
Authors: Balasubramani Vinoth , Montresor Silvio , Tu Han-Yen , Huang Chung-Hsuan , Picart Pascal , Cheng Chau-Jern
Published: November 2021

This paper investigates the influence of several noise reduction techniques implemented in sample rotation holographic tomography for the effective utilization of sparse-data for the three-dimensional tomography reconstruction of the samples used.
Color-multi-view holographic tomography with a single monochromatic sensor
Authors: Hassad Saoucene , Ferria Kouider , Bouamama Larbi , Picart Pascal
Published: November 2021

The paper discusses an approach for simultaneous holographic tomography based on three-color digital holography and recording monochrome holograms. The 3D shape from multiple projections is reconstructed with high frame rate data acquisition.
3D label-free imaging with reflection tomographic diffractive microscopy
Authors: Rasedujjaman Md , Robert Philippe , Chaumet Patrick C. , Giovannini Hugues , Belkebir Kamal , Sentenac Anne , Maire Guillaume
Published: November 2021

Tomographic diffractive microscopy in reflection permits to image the contour of biological cells with high 3D resolution, and has strong potential to monitor important immunological processes, as shown here with preliminary results on phagocytosis.
Tomographic diffraction microscopy of birefringence
Authors: Saba Amirhossein , Lim Joowon , Ayoub Ahmed B. , Antoine Elizabeth E. , Psaltis Demetri
Published: November 2021

We report a three-dimensional birefringence imaging method through a vectorial reformulation of optical diffraction tomography. This method reconstructs the refractive-index tensor of samples and its theoretical framework has been evaluated with numerical and experimental examples.
Dynamic Control of Light Polarization for Optical Data Storage Using Holograms on Phase-Only Liquid Crystal on Silicon Spatial Light Modulators (LCOS SLMs)
Authors: Hong Jintao , Li Jin , Chu Daping
Published: November 2021

We attempts to parallelize data writing by splitting the laser beam into multiple write beams and individually modulating their polarization and intensity using holograms uploaded on a phase-only liquid crystal on silicon spatial light modulator.
Chiral Structures Induced by Elliptically Polarized Light in Amorphous and Liquid Crystalline Azopolymers
Authors: Blagoeva Blaga , Nedelchev Lian , Nazarova Dimana , Berberova-Buhova Nataliya , Stoykova Elena , Park Joongki
Published: November 2021

Photoinduced chiral structures in four azopolymers (three amorphous and one LC) are quantified by the azimuth rotation angle Δθ. Both kinetics of Δθ and its dependence on the input ellipticity are presented.
Review of deep learning based de-noising algorithms for phase imaging and applications to high-speed coherent imaging
Authors: Montresor Silvio , Tahon Marie , Picart Pascal
Published: November 2021

We present a review of deep-learning based algorithms dedicated to the processing of the speckle noise in phase imaging with a focus on the decorrelation phase noise. Applications to high-speed coherent imaging are discussed.
Complex field recovery from on-axis digital hologram using deep learning
Authors: Ju Yeon-Gyeong , Park Jae-Hyeung
Published: November 2021

Conventional on-axis holography requires multiple holograms to obtain a complex field. We propose a deep learning network that recovers complex field preserving the depth information from a single on-axis hologram of diffusive objects.
Ongoing challenges with Edge Machine Learning for Radiation Instrumentation
Authors: Therrien Audrey C. , Groleau Xavier , Gouin-Ferland Berthié
Published: November 2021

Detectors today can generate an enormous amount of data. Machine Learning embedded in hardware near the detector can reduce data rates at the source but many challenges remain before EdgeML is ready for scientific experiments.
Method development of X-ray ptychography: Towards high-resolution and high-throughput coherent imaging
Authors: Yao Yudong , Deng Junjing , Klug Jeffrey A. , Jiang Yi , Wojcik Michael , Roehrig Christian , Preissner Curt , Cai Zhonghou , Lai Barry , Vogt Stefan
Published: November 2021

X-ray ptychography has gained tremendous success in providing quantitative high-resolution imaging for extended samples. Here we report on recent developments in ptychography imaging techniques and the improvement of reconstruction methods to increase ptychographic imaging throughput at the Advanced Photon Source.
Digital Acousto-Optic Holography [Invited]
Authors: Zhou Wen-Jing , Huang Guang-Cai , Zhang Hong-Bo , Yu Ying-Jie , Poon Ting-Chung
Published: November 2021

Digital acousto-optic holography uses sound wave field interacted with interested object to modulate laser beam to generate an optical digital hologram. A numerical reconstruction of the digital hologram is carried out to reproduce the object information. This technology is able to image the interior structure of non-transparent object with high precision.
Surface Shape Reconstruction of Transparent Objects using Structured Light
Authors: Guo Haiyun , Zhou Haowen , Banerjee Partha P.
Published: November 2021

Reconstruction of a transparent phase object based on the varying periodicity of an incident sinusoidal intensity pattern is proposed and verified by using a cm-thick glass cylinder.
Muon Scattering Imaging for Nuclear Applications
Authors: Miyadera Haruo , Kume Naoto , Sugita Tsukasa , Fujimaki Takuro , Nakai Yuki
Published: November 2021

Cosmic-ray muon scattering imaging is sensitive to high-atomic-number materials, and has potential applications in the nuclear industry. Deep learning technique was tested to estimate amount of nuclear materials of Fukushima Daiichi debris.
Alpha Emitter Detection Systems Using UV light Detector
Authors: Kume N. , Okazaki K. , Hoshi T. , Sakamoto N. , Sumita A. , Miyahara Y. , Takagi J.
Published: November 2021

An Alpha-particle detection system for dark environment is developed. This system is capable to detect alpha-induced UV lights from few meters’ distance. A photomultiplier tube is used to detect the UV lights from ionized nitrogen.
Weighted Dynamic Computer Generated Holography for 3D Image Display With a Commercial Video Projector
Authors: Xu Jiayi , Curtis Vincent R. , Caira Nicholas W. , Pégard Nicolas C.
Published: November 2021

We have developed a new algorithm to generate 3D holograms with a MEMS-based display device and a laser light source. Our technique rapidly superimposes mutually optimized coherent frames by encoding them into 8-bit RGB images.
Recent developments in digital holographic imaging by coded aperture correlation holography
Authors: Rosen Joseph , Bulbul Angika , Hai Nathaniel
Published: November 2021

New techniques and systems of coded aperture correlation holography (COACH) with unique imaging properties are presented. Among other things, COACH is applied for incoherent synthetic aperture imaging and quantitative phase imaging.
Decorrelation noise due to surface shape in two-wavelength holographic imaging
Authors: Piniard Matthieu , Sorrente Béatrice , Hug Gilles , Picart Pascal
Published: November 2021

This paper presents a model for decorrelation noise due to surface shape in two-wavelength digital holography. Theory is supported by numerical simulations giving very good agreement.
Obscured object 3D localisation using focus metric cross-correlation in digital holography
Authors: Hall Matthew L , Towers Catherine E , Towers David P
Published: November 2021

Mosquitoes obscured by a bednet are accurately localised in 3D using a cross-correlation between the expected Tamura-of-Intensity focus metric curve of a single object and the obtained focus metric curve of the obscured object.
102 fps incoherent digital motion-picture holography system for sensing of moving fluorescence nanoparticles
Authors: Tahara Tatsuki , Kozawa Yuichi , Ichihashi Yasuyuki , Oi Ryutaro
Published: November 2021

We present an incoherent digital holography system with 102 fps for simultaneous, holographic, and microscopic motion-picture sensing of multiple fluorescence nanoparticles. We utilize single-path single-shot phase-shifting incoherent digital holography with a birefringent material array.
Depth-resolved speckle correlation using quasi-incoherent imaging interferometry
Authors: Dembele Vamara , Wahl Joel , Sjödahl Mikael , Ramser Kerstin
Published: November 2021

We described a new concept on a depth-resolved investigation based on imaging interferometry. It exploits a quasi-incoherent imaging interferometry scheme and speckle image correlation techniques. We can spatially resolve a depth-gating capacity of the imaging interferometer with a resolution of around 26 µm.
High-quality phase-only holographic projection based on bandwidth constraint optimization
Authors: Chen Lizhi , Zhang Hao , Cao Liangcai , Jin Guofan
Published: November 2021

Iterative calculation with bandwidth constraint of the reconstructed field is utilized to optimize phase holograms for high-quality holographic projection. Speckles and artifacts can be effectively suppressed in optical reconstruction by the bandwidth constraint optimization.
Solving the century-old problem of incoherent imaging systems with synthetic aperture using a single opening instead of two
Authors: Bulbul Angika , Rosen Joseph
Published: November 2021

For the last century, optical incoherent synthetic aperture (SA) imaging has always been performed with at least two channels at a time. Herein, we report on an incoherent SA technique having only a single channel at a time.
Microscale viscosity imaging using heterodyne holographic analysis of nanorods rotation
Authors: Gentner Clémence , Kuszelewicz Robert , Berto Pascal , Berret Jean-François , Tessier Gilles
Published: November 2021

By measuring the blinking induced by nanorods either in active (magnetically forced) or passive (Brownian) rotation with heterodyne holography, we performed high resolution viscosity imaging, an essential tool to study many microfluidic and biological processes.
Quantitative Phase Imaging with an Electron Mach-Zehnder Interferometer
Authors: Turner Amy E. , Johnson Cameron W. , McMorran Benjamin J.
Published: November 2021

We present a novel scanning two-grating Mach-Zehnder interferometer in a conventional transmission electron microscope. We use it to (1) demonstrate interaction-free measurements with electrons and (2) perform quantitative phase imaging of a latex nanoparticle.
Methods for mathematical description of discrete signals in digital holography
Authors: Grebenyuk Konstantin A.
Published: November 2021

This paper describes two possible methods for discrete signals description in digital holography, analyses their areas of application, and explains when it is possible to make a transition from one method to another.
Fast algorithm for occlusion culling by using the phase added stereogram
Authors: Martinez-Carranza Juan , Kozacki Tomasz
Published: November 2021

We propose a computer-generated hologram computation method with occlusion effect based on the phase added stereogram method. It is shown that our method can remove the unseen surfaces of 3D objects efficiently.
Correcting Anisoplanatic Aberrations in 2-D and 3-D Digital Holographic Imaging
Authors: Fienup James R.
Published: November 2021

This paper discusses methods for correcting space-variant phase errors in both 2-D and 3-D digital holographic imaging, which is applicable to both remote sensing through atmospheric turbulence and microscopy through a volume of inhomogeneous media.
Vector field encoding approach to secure color image
Authors: Kumar Praveen , Nishchal Naveen K.
Published: November 2021

This paper describes a method based on arbitrary vector light field having spatially variable polarization to encrypt a color image. The information can be encoded into the single polarization component of a vector field using a computer generated hologram.
Using Polarization to Measure Absorption in Cavity Enhanced Spectroscopy
Authors: Guan Yajie , Bandutunga Chathura , Gray Malcolm B. , Chow Jong H.
Published: November 2021

We present a method using polarization for molecular absorption readout in a cavity enhanced spectrometer. We demonstrate a double-pass cavity configuration with CO2, attaining a quantum noise-equivalent absorption sensitivity of ~3x10-13 /Hz /cm.
Intracavity Absorption Spectroscopy of CO2, CO and N2O Using a Fe:ZnSe Laser Tunable in the Range of 3.7–5.3 µm
Authors: Fjodorow Peter , Frolov Mikhail P. , Korostelin Yuri V. , Kozlovsky Vladimir I. , Leonov Stanislav O. , Schulz Christof , Skasyrsky Yan K.
Published: November 2021

We report on the development and applications of a broadband mid-infrared spectroscopic system for sensitive measurements of CO2 isotopes in human breath and atmosphere, CO in breath after cigarette smoking, and N2O in gas flows. © 2021 The Authors
Compact supercontinuum gas spectrometer: principle and airborne field applications
Authors: Chin S. , Herr T. , Lütolf F. , Renevey P. , Van Zaen J. , Dasen S. , Gouman J. , Buchs G. , Vergara G. , Martin H. , Huot L. , Moselund P. M. , Khodabakhsh A. , Harren F. J. M. , Hüglin C. , Emmenegger L. , Lecomte S. , Balet L.
Published: November 2021

A compact and lightweight mid-infrared supercontinuum gas spectrometer has been developed and successfully tested in airborne campaigns to simultaneously monitor the methane and water vapor concentration in the exhaust fumes of ships.
Isotopes on a Boat: Real-Time Spectroscopic Measurement of Methane Isotopologues from Offshore Oil and Gas Emissions
Authors: Yacovitch Tara I. , Daube Conner , Herndon Scott C. , McManus J. Barry
Published: November 2021

Methane emissions from offshore oil and gas facilities in the Gulf of Mexico were quantified from a ship. Continuous laser-based measurement of the carbon-13 and deuterium isotopes of methane shows isotopic variation site-to-site.
Laser-spectroscopic HCl measurements in gas metrology
Authors: Nwaboh Javis A. , Qu Zhechao , Werhahn Olav , Ebert Volker
Published: November 2021

Hydrogen Chloride (HCl) poses health concerns and initiates corrosion on surfaces with water, requiring process control measurements. We report on improved spectral line data and more accurate dTDLAS concentration measurements with 1-uncertainties of 1.5 %.
Development of a Cryogenic Far-infrared Post-dispersed Polarizing Fourier Transform Spectrometer
Authors: Naylor David , Gom Brad , Huber Anthony , Andersona Alicia , Christiansen Adam , Jellema Willem , Lap Bram , Veenendaal Ian , Cournoyer Alain , Grandmont Frederic , Fulton Trevor , Gunuganti Sudhakar , Ade Peter
Published: November 2021

This paper describes the development and status of a cryogenic, far-infrared, post- dispersed, polarizing FTS (PDPFTS), a candidate instrument concept for the next generation of far- infrared astronomical space telescopes.
A Novel Cryogenic Scan Mechanism Design for the Post-Dispersed Polarizing FTS of the SPICA SAFARI Instrument
Authors: Cournoyer Alain , Carbonneau Éric , Gilbert Patrick , Bibeau Louis-Philippe , Houle Simon , Bourque Hugo , Silversides Ian , Dupont Fabien , Grandmont Frédéric , Naylor David , Gom Brad , Gunuganti Sudhakar , Landry Jean-Thomas
Published: November 2021

We describe the engineering development unit of a novel cryogenic scan mechanism suitable for post-dispersed polarizing FTS instruments. Compliance to the stringent SPICA mission requirements is demonstrated through analyses and results from proof-of- concept activities.
The i-FTS Balloon Demonstration Unit: a stratospheric balloon demonstrator for the Arctic Observing Mission
Authors: Gariepy Genevieve , Lantagne Stephane , Grandmont Frederic , Moreau Louis , Delisle Genevieve
Published: November 2021

An imaging FTS was developed and tested in the laboratory (TRL 4). It will be upgraded to fly on a stratospheric balloon in August 2022 to demonstrate the measurement strategy for the Arctic Observing Mission.
Multimode fiber-coupling of a Michelson-type Fourier Transform Spectrometer
Authors: Huke P. , Debus M. , Reiners A.
Published: November 2021

Light of a stabilized laser frequency comb is coupled into a multimode fiber and recorded with a Fourier-Transform spectrometer. The interferograms consist of equidistant, burst-like interference signals, which decorrelate due to modal dispersion and distribution.
Dispersive Fourier Transform Spectrometer for Characterizing superconducting NbTiN films at THz frequencies
Authors: Lap Bram N.R. , Khudchenko Andrey , Hesper Ronald , Rudakov Kirill I. , Dmitriev Pavel , Khan Fedor , Koshelets Valery , Baryshev Andrey M.
Published: November 2021

A Terahertz Dispersive Fourier Transform Spectrometer was used to study the RF properties of superconducting films used for THz detectors. The experimental results were fitted using an extended Mattis-Bardeen theory and show a good agreement.
Standoff detection of hazardous gas in open environments, two decades of R&D activities at DRDC
Authors: Lavoie Hugo , Bouffard François , Puckrin Eldon , Thériault Jean-Marc
Published: November 2021

First responders and military personnel are often faced with safety situations involving the task of detectiing and identifying chemical threats. These threats have become increasingly more prevalent over the last decade. The presentation will cover two decades of research and development by Defence Research and Development Canada (DRDC) on standoff detection and identification of chemical threats with passive and active FTIR.
Hyperspectral remote sensing using Barrier InfraRed Detector Focal Plane Array (BIRD FPA)
Authors: Johnson William R.
Published: November 2021

The detector in the Hyperspectral Thermal Emission Spectrometer (HyTES) was recently upgraded to the high operating temperature InAs/InAsSb superlattice based infrared focal plane. This focal plane allows superior noise equivalent delta temperature. Calibration and validation results are presented from a recent airborne demonstration.
Integrating Imaging Spectroscopy and GIS – Free and Open Source Image Analysis in QGIS with the EnMAP-Box 3
Authors: van der Linden Sebastian , Rabe Andreas , Jakimow Benjamin , Thiel Fabian , Cooper Sam , Okujeni Akpona , Hostert Patrick
Published: November 2021

The EnMAP-Box is a free and open source QGIS plugin. It integrates the strength of Python-based image processing and machine learning with graphical interfaces for handling hyperspectral images and spectral libraries in a GIS environment.
Acquisition and Spectroradiometric Assessment of the Novel WaterSat Imaging Spectrometer Experiment (WISE) Sensor for the Mapping of Optically Shallow Coastal Waters
Authors: Soffer Raymond , Ifimov Gabriela , Pan Yanqun , Belanger Simon
Published: November 2021

The data acquisition and initial spectroradiometric assessment of an airborne hyperspectral data set acquired with the novel WISE sensor for the mapping of a shallow aquatic environment in the Gulf of St. Lawrence is described.
Modeling soil reflectance spectra in the solar domain (400- 2500 nm) as a function of moisture content: Improvement of the MARMIT model
Authors: Dupiau A. , Jacquemoud S. , Briottet X. , Viallefont-Robinet F. , Fabre S. , Philpot W. , Di Biagio C. , Formenti P.
Published: November 2021

An improved version of the MARMIT model is proposed. Wet soil is represented as a dry soil layer surmounted by a layer of a mixture of water and soil particles.
Improved Post-Processing Refinement of Hyperspectral Reflectance Retrievals
Authors: Adler-Golden Steven , Sundberg Robert
Published: November 2021

Reflectance obtained from first principles atmospheric correction algorithms can be improved using spectral polishing. We describe a new polishing method that leverages a library of spectrally smooth materials to virtually eliminate atmospheric residuals.
Hyperspectral Image Analysis: From Conventional Model-based Algorithms towards Deep Learning
Authors: Rasti Behnood
Published: November 2021

Hyperspectral image analysis has considerably evolved during the past decades. The conventional model-based image processing and machine learning techniques are not efficient for hyperspectral image analysis, therefore, other advanced models such as spatial- spectral models were proposed to boost the hyperspectral analysis. Recent advances in ma- chine learning i.e., deep learning (DL) confirm that if an adequate amount of training data is supplied then DL-based algorithms outperform the conventional (shallow) ones. However, the available training data is often limited in hyperspectral imaging, therefore, the advan- tage of DL-based algorithms compared with shallow ones remains an open question. In this paper, we address this issue for two vibrant fields in hyperspectral image analysis i.e., Unmixing and Feature Extraction for Classification.
Optical Identification of Phytoplankton Groups in the Chesapeake Bay: Toward Application of a Hyperspectral Algorithm to Aid Resource Managers
Authors: McKibben S. Morgaine , Uz Stephanie Schollaert
Published: November 2021

Multi- to hyperspectral evolution of satellite ocean color sensors is advancing space- based coastal ocean science and applications. An approach for optically partitioning phytoplankton (microalgae) communities into component groups is being developed for the Chesapeake Bay.
Full-field spatio-temporal shaping via space-time coupling in random media
Authors: Cecconi Vittorio , Kumar Vivek , Pasquazi Alessia , Totero Gongora Juan S. , Peccianti Marco
Published: November 2021

We present a theoretical investigation of broadband, spatio-temporal control of THz light in random media. We consider the refocusing and compression of a THz pulse by optimising the spatiotemporal features of the transmitted field.
Nonlinear Polarization Dynamics of VCSEL with Frequency Comb Injection
Authors: Doumbia Yaya , Wolfersberger Delphine , Panajotov Krassimir , Sciamanna Marc
Published: November 2021

We propose a new approach of broad frequency comb generation by exploiting the polar- ization dynamics in a VCSEL induced by parallel frequency comb injection. Polarization mode competition leads to two tunable combs with orthogonal polarization.
Automated Lookup Table Generation and Cloning of Tuneable Photonic Integrated Filters
Authors: Petrini Matteo , Milanizadeh Maziyar , Morichetti Francesco , Melloni Andrea
Published: November 2021

A control system to automatically generate Lookup Tables for silicon photonic microring resonator filters, is presented. The method is also employed to effectively replicate the spectral response of the same class of devices.
Inverse design for integrated photonics using deep neural network
Authors: Kojima Keisuke , Koike-Akino Toshiaki , Tang Yingheng , Wang Ye
Published: November 2021

Focusing on nanophotonic power splitters, we show that a generative neural network can design a series of devices that achieve nearly arbitrary target performance, with an excellent capability to generalize training data produced by the adjoint method.
High-power, high-speed photodiodes for microwave photonics applications
Authors: Beling Andreas
Published: November 2021

The talk reviews modified uni-traveling carrier photodiodes and their applications in microresonator soliton-based millimeter-wave generation and photonically driven emitters up to 220 GHz.
Coherent Beam Combining of 1 µm DFB Laser Based on Adaptive Optics Control
Authors: Ye Shengwei , Hou Lianping , Hou Bin , Tan Yi , Lai Baiheng , Zhu Licheng , Dong Lizhi , Eddie Iain , Huang Yongguang , Liang Song , Marsh John H.
Published: November 2021

A 1-µm DFB laser monolithically integrated with 1×2 MMI and SOAs has been demonstrated with a stable lasing wavelength. Coherent beam combining using adaptive control of the outputs is demonstrated, showing good agreement with simulations.
Apodized Distributed Bragg Reflector (DBR) Bends for Compact cWDM Filter
Authors: Gebregiorgis Yonas , Chandran Sujith , Papadovasilakis Marios , Bian Yusheng , Rakowski Michal , Afzal Francis O , Augur Rod , Viegas Jaime
Published: November 2021

We propose apodized DBR bends for a compact (0.0024 mm2/ch) 4 channel cWDM filter. Simulations show -39 dB sidelobe suppression, -32 dB cross-talk, and -0.05 dB insertion loss for an optimized device configuration.
Dispersion Management of Periodic Signals using On-chip Dispersive Phase Filters
Authors: Kaushal Saket , Azaña José
Published: November 2021

We propose a dispersive phase filter design suitable for on-chip dispersion management of periodic signals. Compensation of second-order dispersion (1690 ps2/rad) of a 100-GHz pulse train is experimentally demonstrated using mm-long phase filters.
Programmable Photonic Circuits using Silicon Photonic MEMS
Authors: Bogaerts Wim , Takabayashi Alain Yuji , Edinger Pierre , Zand Iman , Jo Gaehun , Sattari Hamed , Verheyen Peter , Jezzini Moises A. , Antony Cleitus , Talli Giuseppe , Saei Mehrdad , Kumar Saurav , Arce Cristina Lerma , Porcel Marco Garcia , Quack Niels , Gylfason Kristinn B. , Niklaus Frank , Khan Umar
Published: November 2021

We present a silicon photonics technology extended with low-power MEMS scalable to large circuits. This enables us to make photonic waveguide meshes that can be reconfigured using electronics and software.
Phase-shifted waveguide Bragg gratings enabled by subwavelength grating structures
Authors: Sun Hao , Chen Lawrence R.
Published: November 2021

We design and realize phase-shifted waveguide Bragg gratings using subwavelength grating structures in silicon-on-insulator. Transmission resonances with a quality factor of ~ 3.2× 104 and a reflection bandwidth of ~ 28 nm are obtained.
Demonstration of An Isolator-Free O-Band Single- Wavelength Heterogeneous Transmitter on Silicon
Authors: Liang Di , Srinivasan Sudharsanan , Kurczveil Geza , Zhang Chong , Descos Antoine , Beausoleil Raymond
Published: November 2021

We demonstrate isolator-free directly and externally modulated transmitter operation based on a high-performance distributed feedback laser and a metal-oxide-semiconductor capacitor modulator, both integrated on the same heterogeneous silicon platform. Improved laser operation is reported too.
Fabrication Tolerant Interferometric Subsystems for Large- Scale Photonic Integration
Authors: Hammond Alec M. , Ralph Stephen E.
Published: November 2021

We demonstrate a novel inverse-design methodology for on-chip interferometric subsystems robust to fabrication variability.
Optimization of Fluorine-based Plasma Etching Processes to Etch Silicon Nitride Nanostructures
Authors: Tareki Abubaker Mustafa , Le Drogoff Boris , Chaker Mohamed
Published: November 2021

Controlled plasma etching processes based on fluorine-based plasmas to fabricate nanostructure in silicon nitride material are reported. These processes were optimized in terms of etch rate, sidewall profile and selectivity over resist mask material.
Highly Efficient Grating Coupler for Silicon Nitride Photonics with Large Fabrication Tolerance
Authors: Kohli Manuel , Messner Andreas , Buriakova Tatiana , Habegger Patrick , Chelladurai Daniel , Blatter Tobias , Smajic Jasmin , Zervas Michael , Fedoryshyn Yuriy , Koch Ueli , Leuthold Juerg
Published: November 2021

We demonstrate low-loss fiber-to-chip coupling via a-Si grating couplers on top of SiN waveguides for C-band TE light. The suggested simple scheme is fabrication tolerant and offers a path towards coupling efficiencies above -1 dB.
Nonlinear Photonic Resonators With Graphene: Saturable Absorption and the Effect of Carrier Diffusion and Finite Relaxation Time
Authors: Nousios Georgios , Christopoulos Thomas , Chatzidimitriou Dimitrios , Pitilakis Alexandros , Tsilipakos Odysseas , Kriezis Emmanouil
Published: November 2021

We assess the CW and dynamic nonlinear optical response of microdisc res- onators enhanced by graphene saturable absorption, by carefully considering the carrier diffusion and finite relaxation time of graphene photoexcited carriers.
Frequency Conversion by Intermodal Dispersive Wave Generation
Authors: Timmerkamp Maximilian , Lüpken Niklas M. , Scheibinger Ramona , Schaarschmidt Kay , Schmidt Markus A. , Boller Klaus-J. , Fallnich Carsten
Published: November 2021

We demonstrate dispersive wave generation in a low-intensity transverse mode on account of intermodal cross-phase modulation driven by an orthogonal mode excited with a high-intensity pulse.
Topology: A New Degree of Freedom for Photonic Entanglement
Authors: Doyle C. , Zhang W.-W. , Bell B. , Bartlett S. D. , Blanco-Redondo A.
Published: November 2021

We report our experimental demonstration of biphoton entanglement between topologically-distinct modes in a bipartite silicon photonics lattice. These results highlight topology as a degree of freedom for entanglement and could have implications in quantum information.
Integrated Photonic Circuits and Platform Development for Trapped-Ion Quantum Computing and Sensing
Authors: Sorace-Agaskar Cheryl , Aull Brian , Braje Danielle , Bruzewicz Colin , Callahan Patrick T. , Chiaverini John , Ciampi Joe , Collins Michael , Donlon Kevan , Felton Bradley , Juodawlkis Paul W. , Kharas Dave , Loh William , McConnell Robert , Morgan Rachel , Niffenegger Robert , Purcell-Schuldt Meghan , Reens David , Ryu Kevin , Sage Jeremy , Stuart Jules , West Gavin N.
Published: November 2021

Integrated photonic technologies for quantum applications are discussed with emphasis on those supporting trapped-ion-based systems. A long-term vision of a fully integrated trapped- ion chip and current work towards its realization are presented.
Polarization Controllable Beam-Splitter and Wavelength Router using a Plasmonic Metasurface
Authors: Benetou Maria I. , Tsakmakidis Kosmas L.
Published: November 2021

We present a plasmonic metasurface capable of integrating light-to-surface plasmon coupling, polarization controllable beam splitting, and wavelength routing. The structure could be an essential element for adaptable on-chip interconnects.
Orientational Disorder in Chiral Bilayer Dielectric Metasurfaces
Authors: Tanaka Katsuya , Rahimzadegan Aso , Arslan Dennis , Fasold Stefan , Steinert Michael , Falkner Matthias , Pertsch Thomas , Decker Manuel , Rockstuhl Carsten , Staude Isabelle
Published: November 2021

Tailored structural disorder in photonic metasurfaces opens new opportunities in advanced light shaping. We study a chiral optical response enabled by rotational disorder in chiral bilayer metasurfaces consisting of low-loss dielectric constituents.
8×25 Gb/s DWDM Transmitter Demonstration on a Heterogeneous Silicon Photonic Platform
Authors: Srinivasan Sudharsanan , Liang Di , Kurczveil Geza , Tossoun Bassem , Descos Antoine , Beausoleil Raymond
Published: November 2021

A DWDM transmitter with aggregated bandwidth of 200 Gb/s is demonstrated using a comb laser and microring modulator fabricated on the same heterogeneous silicon platform, paving the way for a fully integrated transceiver.
Towards Low Propagation Losses in Active Photonic Multi-Project Wafer Runs
Authors: Carpenter Lewis G. , van Niekerk Matthew , Begović Amir , Sundaram Vijay S.S. , Deenadayalan Venkatesh , Palone Thomas , Fanto Michael , Preble Stefan , Baiocco Christopher , Leake Gerald L. , Fahrenkopf Nicholas M. , Harame David L.
Published: November 2021

AIM Photonics has had an active multi-project wafer (MPW) program since 2015 and in our latest work we will present our new integration aimed at the reduction of waveguide propagation losses. Often low losses are prioritized for passive MPWs runs but for key application spaces such as Telecommunications and Quantum Technology, it is imperative to incorporate both low-loss waveguides and active devices on a single die. Within this work we have demonstrated a loss of 1.0 dB/cm in Si strip waveguides and 0.48 dB/cm in SiN waveguides, a reduction of 0.4-3.5 dB/cm and 1-1.5 dB/cm, respectively, when compared to other MPW foundries.
High-Index Doped Silica Glass Planar Lightwave Circuits
Authors: Chu Sai T. , Little Brent E.
Published: November 2021

We provide a review of the recent progress of the high-index doped silica glass planar lightwave circuits with a focus on the emerging applications in nonlinear optics and RF photonics.
GHz Plasmonic Broadband ITO MZI Modulator in Si Photonics
Authors: Amin Rubab , Maiti Rishi , Gui Yaliang , Suer Can , Miscuglio Mario , Heidari Elham , Chen Ray T. , Dalir Hamed , Sorger Volker J.
Published: November 2021

Here, we demonstrate a spectrally broadband, GHz-fast Mach-Zehnder-based modulator, showing a small VpL of 95 V-µm, utilizing a 1.4µm-short phase-shifter by heterogeneously integrating ITO films into silicon photonics.