bluuebunny/crossref_metadata_2025 huggingface dataset:
Detection of toxic chemicals in hand sanitizers using near-infrared spectroscopy
Authors: Chowdhury Aminur Rashid , Burney Umar , Hutter Dan , Lee Tse-Ang , Hutter Tanya
Published: November 2021

Many alcohol-based hand sanitizer products contain toxic ethanol substitutes. In this work, we demonstrate the application of near-infrared spectroscopy for the detection of methanol and 1- propanol in hand sanitizer using partial least square regression (PLSR).
Sensing of ethane and formaldehyde in air using mid-infrared laser radiation
Authors: Winkowski M. , Stacewicz T.
Published: November 2021

The optical sensor of ethane and formaldehyde using multipass spectroscopy in 3,3 µm range is described. Due to quenching of optical noises by novel method the detection limit of a single ppb was achieved.
Analysis of microfiber structures and performances for fabricating multimode interference sensors
Authors: Abe Naoaki , Kihara Mitsuru
Published: November 2021

We investigated microfiber characteristics for use in multimode interference sensors, revealing that the shortest waist length in the tapered region needs to be increased. Our fabricated sensor can measure the refractive index of aqueous solutions.
Automated Detection and Quantification of Gas Influx Velocity in Wellbore from Fiber-Optic Sensor Data
Authors: Ekechukwu Gerald K. , Sharma Jyotsna
Published: November 2021

Early detection of gas influx into a wellbore is crucial to prevent catastrophic blowout. An automated workflow is presented to detect gas influx and estimate velocity from fiber-optic sensor data, in a 5025 ft deep wellbore.
Mean Gradient Descent: An Empirical-Parameter-Free Approach for Inverse Problems in Imaging
Authors: Rajora Sunaina , Butola Mansi , Khare Kedar
Published: November 2021

We propose a new optimization approach, namely Mean Gradient Descent (MGD), to solve a variety of inverse problems in imaging science. The proposed algorithm does not involve empirical parameters, is noise robust and computationally inexpensive.
Flexible and Highly Scalable Concept for an FMCW LiDAR PIC based on Tilted Grating Couplers
Authors: Voskerchyan Vahram , Tian Yu , Soares Francisco M. , Diaz-Otero Francisco J.
Published: November 2021

We propose a novel FMCW LiDAR Photonic Integrated Circuit that relies on slanted grating couplers. Our simulations on an SOI waveguide structure show that the concept is feasible with a FOV of 100
◦
by 12
◦
.
A Modified Algorithm for Compressed Sensing Multispectral Image Recovering using a Single Pixel Camera
Authors: Fabbri Carlos , Santos Josemir Coelho
Published: November 2021

The present article shows a modified compressed sensing algorithm using the underlined physical configuration of Digital Micromirror Device- DMD - a matrix - to recover, successfully, images with a Single Pixel Cam simulation apparatus.
Implementation of Dedicated Circuit for Scaled Binary Ghost Imaging
Authors: Hoshi I. , Shimobaba T. , Kakue T. , Ito T.
Published: November 2021

Scaled binary ghost imaging has a challenge for high calculation amounts. In this study, we implement a scaled binary ghost imaging into a field-programmable gate array to accelerate the processing time.
Fast and high-precision 3D face scanning system based on infrared fringe projection
Authors: Guo Xinming , Yin Wei , Zuo Chao , Feng Shijie
Published: November 2021

In order to improve the accuracy of face recognition, we propose a fast and high- precision 3D face scanning system based on infrared fringe projection, which can achieve fast and high-accuracy acquisition of 3D faces.
Estimation of phase derivative with sharp variations in digital holography using total variational regularization
Authors: Vithin Allaparthi Venkata Satya , Gannavarpu Rajshekhar
Published: November 2021

The article presents an optimization approach to estimate phase derivatives using anisotropic total variational regularization in digital holography. The results validate the method’s performance in handling sharp variations.
Transport of intensity equation: noninterferometic phase imaging and diffraction tomography
Authors: Zuo Chao
Published: November 2021

In this talk, we provide an overview of the basic principle, research fields, and representative applications of transport of intensity equation, focusing particularly on optical imaging and microscopy.).
Improved Compressive Temporal Imaging using a Shuffled Rolling Shutter
Authors: Guzmán Felipe , Díaz Nelson , Vera Esteban
Published: November 2021

We propose a slight modification to the rolling shutter by shuffling the scanline mechanism to significantly improve its sampling ability to recover high speed videos from a single image using compressive reconstruction algorithms.
Direct Hyperspectral Dual-Comb Imaging
Authors: Mateos Pedro Martín
Published: November 2021

Direct dual-comb imaging uses two closely matched frequency combs interfering at rates that can be detected by a video camera to enable hyperspectral imaging with unprecedented optical resolution and rapid measurement capabilities.
A Mid-Infrared Dual Comb Spectrometer for the Determination of Stable Isotope Ratios of Carbon Dioxide
Authors: Goldschmidt Jens , Nitzsche Leonard , Kießling Jens , Wolf Sebastian , Kühnemann Frank , Wöllenstein Jürgen
Published: November 2021

A mid-infrared dual-comb spectrometer is utilized for the determination of the isotopic ratio of the stable isotopologues 12CO2 and 13CO2 under atmospheric conditions in the ν3 band of carbon dioxide at 4375 nm.
Cross-Comb Spectroscopy using Sum-Frequency Sampling in the Mid-IR
Authors: Liu Mingchen , Gray Robert M. , Roy Arkadev , Marandi Alireza
Published: November 2021

We introduce the cross-comb spectroscopy scheme by sum-frequency sampling of a mid-infrared frequency comb using a near-IR comb with a slightly shifted repetition rate. We experimentally demonstrate comb-tooth-resolved measurement of atmospheric CO2 around 4.25 µm.
A low-cost, submersible, digital holographic microscope for in situ microbial imaging
Authors: Ramirez A. J. , Schierman B. W. , Zheng L. , Dalporto B. M. , Belvin L. , Burch T. P. , Mullen A. D. , Wallace J. K
Published: November 2021

We present a submersible digital holographic microscope that enables vol- umetric imaging of bacterial samples at video rates. This low-cost and robust instrument features one-micron spatial resolution and artificial intelligence for species detection and tracking.
A Spectral Optimization Approach for Retrieving Bottom Characteristics in Shallow Water Environments Using Remote Sensing Data
Authors: Moses Wesley J. , Ackleson Steven G.
Published: November 2021

Hyperspectral data can be exploited to retrieve multiple biophysical parameters of the environment. We present results from applying a spectral optimization approach to retrieve bottom characteristics in a coral reef environment using airborne hyperspectral data.
Autofocusing in Digital Holography based on Eigenvalue Distribution
Authors: Ghosh Anik , Kulkarni Rishikesh
Published: November 2021

This paper proposes a novel autofocusing metric in digital holography based on the distribution of eigenvalues corresponding to the reconstructed images. Simulation and experimental results demonstrate proposed method’s applicability for both amplitude and phase objects.
Motion Tracking of Polymer Metamaterials Under Shock Waves
Authors: Roper Christopher D. , Wang Zhehui , Sentz Kari , Nguyen Nga T. T. , Dattelbaum Dana M. , Walker Mitchell L.R.
Published: November 2021

A new algorithm to analyze X-ray movies generated by a synchrotron source is described. The algorithm is used to track the motion of polymer metamaterials under shock waves and to produce the velocity field of the dynamic scenes.
Sub-Doppler Optical-Optical Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe
Authors: de Oliveira Vinicius Silva , Silander Isak , Rutkowski Lucile , Johansson Alexandra C. , Soboń Grzegorz , Axner Ove , Lehmann Kevin K. , Foltynowicz Aleksandra
Published: November 2021

We use a 3.3 µm high-power continuous wave pump and a 1.67 µm comb probe to detect transitions in the 3ν3 ← ν3 range of methane with sub-Doppler resolution over 6 THz of bandwidth. We achieve high absorption sensitivity for the comb probe using an enhancement cavity and a Fourier transform spectrometer with auto-balanced detection.
Improving absorption models for CO2 at high pressure and temperature using dual frequency comb spectroscopy
Authors: Cole Ryan K. , Hoghooghi Nazanin , Rieker Gregory B.
Published: November 2021

We present dual frequency comb absorption spectroscopy of CO2 in conditions up to 25 bar and 981 K. We test and improve absorption models for these conditions to support applications in combustion and planetary science.
Intensity-based quantitative phase imaging via space- domain Kramers-Kronig relations
Authors: Baek YoonSeok , Park YongKeun
Published: November 2021

We present intensity-based quantitative phase imaging with an optical microscope and illumination control by exploiting the space-domain Kramers-Kronig relations that transform the spatial variation in intensity to the spatial variation in phase.
Separation of an interferogram from a fringe contained image measured by a static modulated Fourier transform spectrometer
Authors: Cho Ju Yong , Jang Won Kweon
Published: November 2021

1-dimensional Fourier transform and data suppression are suggested to separate an interferogram from a fringe contained image measured by a static modulated Fourier transform spectrometer. Optical path difference and wavenumber calibration in focal plane are discussed.
Analysis of the Distortion Effects in Holographic Projection Display caused by the Retroreflector Screen
Authors: Askari Mehdi , Park Jae-Hyeung
Published: November 2021

Fig. 1. (a-b) Optical system configurations to calculate PSF. (c) Unit cell structure. (d) Effective aperture area. 2. Methodology Figure 1(c) shows the triangular unit cell RR with three orthogonal faces and a centroid. Effective aperture area of a triangular unit cell in RR plane is the area which retroreflects the light back to its source. It can be calculated from red and yellow triangular apertures whose normals are parallel to the diagonal (blue arrow) of a corner cube as in top of Fig.1(d). Red triangle corresponds to the triangular unit cell aperture for input light and yellow triangle corresponds to the inverted triangular aperture after light reflects from all three orthogonal faces inside the red triangle. When the angle between the incident light and the diagonal to the corner cube is parallel, we have ideal hexagonal effective aperture (in gray region) as shown in mid row of Fig.1(d) [1]. For different angles to the diagonal of input light, we have different effective apertures as shown in the bottom row of Fig. 1(d). The region outside of gray area does not retroreflects the light. Considering the conjugate structure of a retroreflector, the positional shift is also introduced depending on the size of unit cell RR. In MATLAB simulations, we used the point symmetric transformation (PST) given by, ′ = (2() – ), (1) where, and ′ indicate the incident and retroreflected position of the optical field with respect to the centroid of each unit cell RR, respectively. Figure 2(a) shows an example of the complex field for a point source calculated just before the RR plane by an angular spectrum (AS) method. Figure 2(b) shows the effective aperture mask for the point source. Note that the effective aperture mask depends on the point source distance and its lateral position. Figure 2(c) shows the complex field after masking. Figure 2(d) shows the complex field after performing PST operation at each unit cell in RR plane. The complex field then propagates back to the original point source distance giving the PSF of the RR screen in the simulation. Fig. 2. Optical wave simulation flow in MATLAB
The polymer optical fiber as a transducer for measuring vibration frequency
Authors: Varyshchuk V. , Bobitski Y.
Published: November 2021

The vibration frequency transducer based on a polymer optical fiber is presented. The proposed technique relies on the modulation of the modal distribution in multimode fiber and can be implemented in a single sensor platform.
CNN vs. SVM for Automatic Train Moving Recognition by Optical Fiber Sensing Data Analysis
Authors: Hamadi Abdelkader , Kabalan Ali , Garbini Gabriel Papaiz , Hammi Tarik
Published: November 2021

This paper introduces a comparison study between SVM and a convolutional neural network for automatic train moving recognition by exploiting distributed acoustic sensing data. The results show the performance of each of the two methods for such a goal.
A modular and open source prototyping platform for optical sensors based on a 3D printed honeycomb breadboard
Authors: Toschke Yannic , Bourdon Bjoern , Berben Dirk , Imlau Mirco
Published: November 2021

We present a modular optical honeycomb breadboard based on 3D-printed building bricks and industrial aluminum extrusions for agile prototyping of (laser based) optical assemblies in many engineering processes outside the laboratory environment.
Application of Open-Path Fourier Transform Infrared (OP- FTIR) Spectroscopy to Air-Sea Greenhouse Gas Exchange
Authors: Wiacek Aldona , Hellmich Martin , Flesch Thomas
Published: November 2021

An OP-FTIR system was deployed over the ocean surface to collect absorption spectra at two heights, alternating quickly in time. Gas concentrations were derived and used to calculate air-sea gas fluxes by the flux-gradient method.
Ultrashort Laser Microsurgery of Mammalian Embryos at Blastocyst Stage for Application in Assisted Reproductive Technologies
Authors: Ilina Inna V. , Khramova Yulia V. , Ivanova Anna D. , Filatov Maxim A. , Sitnikov Dmitry S.
Published: November 2021

We apply femtosecond laser pulses for precise microsurgery of mammalian embryos at the blastocyst stage in order to extend the range of noninvasive methods in the Assisted Reproductive Techniques (ART), increase their safety and effectiveness. © 2021 The Author(s)
A full-thickness uterus visualization using axial registration of OCT image volumes
Authors: Donis Isaac C. , McLean James P. , Fang Shuyang , Myers Kristin M. , Hendon Christine P.
Published: November 2021

A full-thickness visualization of OCT volumes using axial registration is presented. Uterine specimens were obtained from 3 pregnant and 2 non-pregnant patients. Image processing techniques enabled an en-face visual representation of the tissue fiber structure.
Label-free Multimodal Nonlinear Optical Imaging of Needle Biopsies: Towards Real-time Monitoring of Living Biopsies
Authors: Yang Lingxiao , Park Jaena , Renteria Carlos , Chaney Eric J. , Marjanovic Marina , Philips Heidi , Boppart Stephen A.
Published: November 2021

A portable label-free multimodal nonlinear optical imaging platform has been developed and demonstrated for intraoperative imaging of needle biopsies in canine cancer surgeries, with investigations on the integrity of freshly excised biopsies over time.
Regions of Interest and their Influence on the Limit of Detection in an Intensity-Based Refractive-Index Sensing Setup
Authors: Kraft F.A. , Blaesi J. , Gerken M.
Published: November 2021

The image information of an intensity-based refractive-index sensing setup to detect refractive-index changes on photonic crystals enables improving the limit of detection from (4.17±0.35)×10−5 to (1.66±0.13)×10−5 by evaluating different area sizes.
Numerical Simulation of Tumor Hyperthermia Mediated by Silicon Nanoparticles
Authors: Sokolovskaya O. I. , Zabotnov S. V. , Golovan L. A. , Kashkarov P. K. , Kurakina D. A. , Sergeeva E. A. , Kirillin M. Yu.
Published: November 2021

The feasibility of photohyperthermia treatment of nodular basal cell carcinoma (BCC) in presence of silicon nanoparticles is studied by numerical simulations employing Monte-Carlo and finite element methods.
Spatiotemporal optical coherence (STOC) manipulation for blood flow imaging of the human retina in vivo
Authors: Borycki Dawid , Auksorius Egidijus , Węgrzyn Piotr , Wojtkowski Maciej
Published: November 2021

Spatiotemporal optical coherence (STOC) manipulation is a new method for crosstalk-free, aberration-free, high-speed, high-resolution imaging of the human eye in vivo. Here, we apply STOC for deep blood flow imaging of the human retina in vivo.
A Computational Framework for Multiphysics and Multiscale Modeling of Laser Interactions with Biological Tissue
Authors: Chimakurthi Satish , Nucci Michael , Blades Eric , Jacques Steven L. , London Richard A. , Wharmby Andrew
Published: November 2021

This paper summarizes the concept design of a versatile computational multiphysics framework that supports modeling and simulation of a variety of laser-tissue interaction mechanisms. A sample result from a preliminary verification study is presented. Comments and questions should be directed to Dr. Satish Chimakurthi.
Deep-Learning Algorithm To Detect Anomalies In Compressed Breast: A Numerical Study
Authors: Balasubramaniam Ganesh M. , Arnon Shlomi
Published: November 2021

A deep-learning algorithm is employed to detect simulated anomalies inside compressed breasts using near-infrared light. Anomaly detection is improved by 55% after employing the algorithm according to the Dice similarity coefficient.
Bi-directional Flow Measurements with Time-series Optical Coherence Tomography
Authors: Wang Qiang , Gong Peijun , Afsharan Hadi , Silva Dilusha , Joo Chulmin , Cense Barry
Published: November 2021

Blood flow is a key parameter in disease assessment. A time-series optical coherence tomography angiography method is implemented to measure the axial blood flow velocity and direction in a phantom and human tissue, in vivo.
Effects of signal fluctuations in broadband near-infrared spectroscopy (bb-NIRS) on concentration quantification
Authors: Shahdadian Sadra , Truong Nghi Cong Dung , Wang Xinlong , Liu Hanli
Published: November 2021

This study proposes methods to quantify, address, and, if applicable, calibrate errors propagated from spectral noise and drift to calculated chromophore concentrations. Phantom and human measurements were done to illustrate and evaluate these generalized methods.
Novel Stable Platform for High Pulse Power, Chirped Pulse Amplified Femtosecond Laser System Enables New Fields of Use
Authors: Strisower John
Published: November 2021

Low rep rate, high-pulse-power femtosecond lasers are uncommon due to instability in uncontrolled environments. Photometics’ design provides the stability required to bring chirped-pulse, high-pulse-power femtosecond lasers to new fields of use.
Hemodynamic Response Function from Osteoarthritic Pain using functional Near-Infrared Spectroscopy
Authors: Vallenilla Natalia A. , Montero-Hernandez Samuel , Ahn Hyochol , Miao Hongyu , Pollonini Luca
Published: November 2021

Pain-related neural mechanisms are not well understood yet. FNIRS could elucidate the hemodynamic responses under pain stimulation. We present a qualitative perspective on brain response to pain in patients suffering from osteoarthritis.
Multispectral Photophletysmography for Evaluation of Cutaneous Flowmotions
Authors: Marcinkevics Zbignevs , Aglinska Alise , Rubins Uldis , Grabovskis Andris
Published: November 2021

Human skin may reflect health conditions. Important and possibly diagnostically potent components of microcirculation are slow flow oscillations-flowmotions, however there is a lack of studies in this field. The present pilot study was devoted to evaluation of multispectral imaging photoplethysmography in determination of different components of flowmotions. Eight subjects were enrolled for the study. During resting conditions video was captured from dorsal aspect of hand at seven different wavelength and flowmotion analysis performed. Results indicate that at the resting conditions neurogenic component along with endothelial are dominant regardless of wavelength, while myogenic has the lowest spectral power. Results confirm the potential of multispectral photoplethysmography for cutaneous flowmotion detection.
BOLD fMRI in Mice with Large-Scale Optical Cranial Windows
Authors: Doran Patrick , Mächler Philipp , Sencan Ikbal , Thunemann Martin , Fu Buyin , Jiang Yuanyuan , Yu Xin , Mandeville Joseph B. , Sakadzic Sava , Devor Anna
Published: November 2021

We demonstrate the feasibility of fMRI in mice with large-scale chronic optical cranial windows.
Approaches to Improve Brain Specificity and Accuracy with Interferometric Diffusing Wave Spectroscopy
Authors: Zhao Mingjun , Zhou Wenjun , Srinivasan Vivek J.
Published: November 2021

Employing interferometric Diffusing Wave Spectroscopy at 3.5 cm source-collector separation on the human forehead, we evaluate improvements in data analysis: zero-lag derivative, multilayer models, and absorption compensation, during voluntary apnea.
Birefringence Microscopy for Label-Free Imaging of Myelin Degeneration in Brain Sections
Authors: Blanke Nathan , Bigio Irving J.
Published: November 2021

We report on birefringence microscopy for high-resolution imaging of myelin in unlabeled histological brain sections. We demonstrate our system for imaging structural breakdown of myelin resulting from ischemic brain injury in the rhesus monkey.
Using 3D Optical Photostimulation Induced Artificial Perception to Investigate Neuronal Ensembles Coding Visual Information
Authors: Rózsa Balázs , Szalay Gergely , Ócsai Katalin , Nagy Dominika , Plauška Andrius , Pinke Domonkos , Csupernyák Csaba , Szepesi Áron , Katona Gergely
Published: November 2021

To understand brain function, we have developed a multiphoton approach based on acousto-optics (AO) to simultaneously measure and optically stimulate the activity of cortical neurons, even during behavior, with millisecond precision and subcellular spatial resolution.
A Method for Improving the Dynamic Range of Integrated Diffuse Speckle Contrast Spectroscopy
Authors: Biswas Arindam , Takshi Arash , Parthasarathy Ashwin B.
Published: November 2021

We present a method to improve the dynamic range of blood flow measurements with Integrated Diffuse Speckle Contrast Spectroscopy (iDSCS) by reducing the detrimental effects of speckle averaging.
Miniaturized head-mounted device for whole cortex mesoscale imaging in freely behaving mice
Authors: Rynes Mathew L , Surinach Daniel , Linn Samantha , Laroque Michael , Rajendran Vijay , Dominguez Judith , Hadjistamolou Orestes , Navabi Zahra S , Ghanbari Leila , Johnson Gregory W , Nazari Mojtaba , Mohajerani Majid , Kodandaramaiah Suhasa B
Published: November 2021

The mini-mScope is a wide-field miniaturized, head-mounted fluorescence microscope for imaging in freely behaving mice. We demonstrate recording mesoscale calcium activity across the dorsal cortex during sensory-evoked stimuli, open field behaviors, and social interactions.
Volumetric fluorescence imaging with a wearable Computational Miniature Mesoscope
Authors: Xue Yujia , Davison Ian G. , Boas David A. , Tian Lei
Published: November 2021

We demonstrate a novel, compact, and wearable imaging device called Computational Miniature Mesoscope (CM2), that enables high-resolution volumetric fluorescence imaging within a single snapshot across a wide field-of-view and an extended depth-of-field.
Bio-FlatScope: a flat, lensless microscope for fluorescence imaging
Authors: Wu Jimin , Yan Dong , Boominathan Vivek , Adams Jesse K. , Veeraraghavan Ashok , Robinson Jacob T.
Published: November 2021

We developed a lensless microscope with small, inexpensive form factor, large field-of-view (FOV) and cellular resolution for fluorescence imaging. Proof-of-principle measurements with “Bio-FlatScope” are presented in fixed biological samples.
Estimating the Spatial Behavior of Fiber Photometry Across Different Brain Regions
Authors: Montinaro Cinzia , Spagnolo Barbara , Pisanello Marco , Pisano Filippo , Balena Antonio , Bianco Marco , Brunetti Virgilio , De Nuccio Francesco , Lofrumento Dario Domenico , Verri Tiziano , De Vittorio Massimo , Pisanello Ferruccio
Published: November 2021

We describe a method to characterize the spatial behavior of fiber photometry signals across different mouse brain regions, highly differentiating in cortex, hippocampus and striatum.
Using a laser scalpel to analyze dendritic spikes
Authors: Castañares Michael L. , Bachor Hans-A. , Daria Vincent R.
Published: November 2021

A dendritic spike is a vital computing mechanism in neurons and spikes occurring in complex dendritic arborizations are difficult to probe. Here, we use laser dendrotomy to study dendritic spikes in oblique branches of cortical neurons.
Investigation of neurovascular coupling in four vigilance states of the human brain by simultaneous EEG-fNIRS measurement and wavelet coherence analysis
Authors: Rabbani Parisa , Wang Xinlong , Babawale Olajide , Kim Jae Gwan , Liu Hanli
Published: November 2021

We conducted wavelet coherence analysis to quantify/image the cerebral neurovascular coupling at infra-slow frequencies during four different awake-to-sleep vigilance states using whole-head, simultaneous EEG and functional Near Infrared Spectroscopy measurements from 15 healthy human brains.
Serpentine Integrated Grating Spectrometer
Authors: Brand M. , Zhang B. , Popović M. , Dostart N. , Wagner K.H.
Published: November 2021

The serpentine integrated grating spectrometer uses a meandering delay line and outcoupling grating rows to implement a crossed-dispersion wide-bandwidth integrated spectrometer with resolving power of 105 and 104 spectral bins in a few cm3 volume.
SLAM Imaging Pipeline for High Dynamic Range Digital Pixel Image Sensor
Authors: Liu Chiao , Berkovich Andrew , Capoccia Raffaele , Chen Song , Tsai Tsung-Hsun
Published: November 2021

Digital pixel sensors (DPS) hold great potential for computer vision applications such as SLAM. In this paper, we describe an end-to-end vision system for SLAM benchmarking, including the DPS, ISP, and exposure control.
A computational study of irregular beam optics to build up an efficient tomographic sensor
Authors: Choudhury Satwik , Pal Sandip
Published: November 2021

Optimization of combustion efficiency in various practical combustion systems often requires tomographic imaging of various combustion products. Here we are presenting a novel beam-optimizing technique to build up the optical-acquisition system of a tomographic sensor.
Coded wavefront sensor and non-iterative learning-based reconstruction
Authors: Qi Miao , Wang Congli , Heidrich Wolfgang
Published: November 2021

Here we put forward a coded wavefront sensor and neural network framework to achieve wavefront reconstruction. The new framework outperform the preview method not only in the speed but also in the image fidelity.
Light-field microscopy with correlated beams for high resolution volumetric imaging
Authors: D’Angelo Milena , Di Lena Francesco , Garuccio Augusto , Pepe Francesco V. , Scagliola Alessio , Scarcelli Giuliano
Published: November 2021

Light-field imaging is an inspiring modality for high-speed volumetric imaging We demonstrate diffraction-limited extended volumetric imaging by a light-field microscope exploiting spatio-temporal correlations of light, overcoming the resolution limitations of conventional implementations of light-field imaging.
Breaking Symmetries in Data-Driven Phase Retrieval
Authors: Manekar Raunak , Tayal Kshitij , Zhuang Zhong , Lai Chieh-Hsin , Kumar Vipin , Sun Ju
Published: November 2021

The existing iterative and data-driven methods fail to solve phase retrieval due to the intrinsic problem symmetries. We propose two end-to-end learning methods that break the barrier and work in a new regime.
Reflectivity Analysis of Isolated Particle on a Substrate on Incoherent Light by RCWA
Authors: Hoshino Tetsuya , Banerjee Saswatee , Aoki Sadao , Itoh Masahide
Published: November 2021

We analyze the reflectivity of a film and rectangle with incoherent behavior by rigorous coupled-wave analysis. The sample was Rhodamine B on a transparent substrate, and its absorption spectrum was measured and simulated.
Recovering Missing Data in Coherent Diffraction Imaging
Authors: Barmherzig David A. , Barnett Alex H. , Epstein Charles L. , Greengard Leslie F. , Magland Jeremy F. , Rachh Manas
Published: November 2021

A method is presented for inferring missing low-frequency data in coherent diffraction imaging via the least-squares solution of a linear system. This gives rise to improved image reconstruction when solving the phase retrieval problem.
Untrained Neural Network with Explicit Denoiser For Lensless Inline Holographic Microscopy
Authors: Galande Ashwini S , Thapa Vikas , Ram Hanu Phani , John Renu
Published: November 2021

We have implemented an untrained deep neural network powered with explicit regularization by denoising for twin image-free reconstruction in inline lensless holographic microscopy. The performance of different denoisers in twin image elimination is discussed.
Adaptive Scanning in Ptychography through Deep Multi-Objective Reinforcement Learning
Authors: Schloz M. , Müller J. , Pekin T. C. , Van den Broek W. , Koch C. T.
Published: November 2021

This paper presents a method that allows to improve the quality of ptycho- graphic reconstructions at a reduced dose by adaptively scanning the specimen and thus providing only local information redundancy in regions of highest importance.
Multispectral Fluorescence Lifetime Imaging with Single- Pixel Cameras and Data Fusion
Authors: Soldevila Fernando , Lenz Armin J. M. , Ghezzi Alberto , Farina Andrea , D’Andrea Cosimo , Tajahuerce Enrique
Published: November 2021

We present a technique for multispectral fluorescence lifetime imaging with high spatial resolution by combining both single-pixel and data fusion imaging techniques. The resultant 4D hypercube can be used to identify fluorophore species.
Three-dimensional reconstruction of integrated circuits by single-angle X-ray ptychography with machine learning
Authors: Kang Iksung , Yao Yudong , Deng Junjing , Klug Jeffrey , Vogt Stefan , Honig Steven , Barbastathis George
Published: November 2021

The interiors of integrated circuits (ICs) are imaged by X-ray translational scanning ptychography as the sole acquisition method of raw data. This is unlike ptycho- tomographic and ptycho-laminographic schemes, which also require the angle of illumi- nation to be scanned. The computational reconstruction is reconstructed by a Transformer, a form of machine learning algorithm also used in dynamical image processing. During training, the Transformer learns the rich priors that define the IC interior. Even though 3D reconstructions obtained from experimental raw data are not error-free, the technique shows promise toward drastically reducing the overall scanning time.
A Mitsuba-based Study on Trade-offs Between Projection and Reflection Based Systems in Structured-Light 3D Imaging
Authors: Wang Tianfu , Schiffers Florian , Willomitzer Florian , Cossairt Oliver
Published: November 2021

We present a first study on the trade-offs between projection and reflection based 3D imaging systems under diffusive and specular reflection mixtures. Experiments are conducted in our projection/reflection simulator framework using the Mitsuba2 ren- derer.
The Imaging Operator in Indirect Imaging Correlography
Authors: Balaji Muralidhar M. , Liu Jiapeng , Ahsanullah Danyal , Rangarajan Prasanna
Published: November 2021

The work presents a mathematical model for the imaging operator in Non-Line-of-Sight Imaging using Indirect Imaging Correlography. The model is used to analyze the impact of object pose and obliquity on system performance, through a series of simulations and experiments.
Depth Estimation of Non-line-of-sight Objects from Scattered Light Enhanced by the Infrared Light Field
Authors: Sasaki Takahiro , Hashemi Connor , Leger James R.
Published: November 2021

We experimentally demonstrate depth estimation of human temperature NLOS objects from infrared light scattered off a construction wall. The measured IR light field is used to enhance the weak scattered signature and to perform depth estimation.
Redefining the ESRF tomography software
Authors: Viganò Nicola , Cloetens Peter , Di Michiel Marco , Rack Alexander , Tafforeau Paul
Published: November 2021

We are redesigning the ESRF tomography software for both data acquisition and processing, to offer unified user experience, data format and processing software across all beamlines. This will foster collaborations with the leading research groups in the field.
Resolution improvement and blur removal of light field data converted from hologram using deep learning
Authors: Park Dae-Youl , Park Jae-Hyeung
Published: November 2021

We propose a method to suppress blurring and improve spatial resolution of light field data using deep learning. The proposed method enhances the quality of the light field data extracted from a hologram, generating all-in-focus views over large depth range of the three-dimensional scene.
Axial super-resolution for optical coherence tomography with the iterative adaptive approach
Authors: de Wit Jos , Angelopoulos Kostas , Kalkman Jeroen , Glentis George-Othon
Published: November 2021

Spectral estimation can improve axial resolution for optical coherence tomography reconstruction. Using a computationally-efficient implementation of the non-parametric iterative adaptive approach, we significantly improve the axial resolution over Fourier-based reconstruction and obtain high-quality B-scans in processing times below 2 seconds.
Contrast enhancement by numerical preprocessing in digital lensless holographic microscopy
Authors: Tobon-Maya Heberley , Trujillo Carlos , Garcia-Sucerquia Jorge
Published: November 2021

This work presents a numerical method to enhance the contrast of intensity hologram reconstructions in digital lensless holographic microscopy. The method manipulates the hologram and reference images through functionalized operations inspired in the recording setup.
Comparison Between Rectangular and Hexagonal Hogel for Holographic Stereogram Printer Based on Integral Imaging
Authors: Khuderchuluun Anar , Dashdavaa Erkhembaatar , Imtiaz Md. Shariar , Kim Joon Hyun , Kang Hoonjong , Kim Nam
Published: November 2021

Comparison of rectangular and hexagonal hogel printing for holographic stereogram printer based on integral imaging is presented. The hexagonal hogel printing is efficient than rectangular hogel printing and enhances the reconstruction image quality. Numerical simulation and optical reconstructions are implemented.
Holographic Tomography: Techniques and Biomedical Applications [Invited]
Authors: Balasubramani Vinoth , Cheng Chau-Jern
Published: November 2021

Holographic tomography (HT) is a three-dimensional quantitative imaging method used to study the biophysical parameters of cells or tissues at its subcellular level. The exciting label-free HT techniques and its biomedical applications will be illustrated and discussed.
Measurement of Temperature and Temperature Fluctuations in Micro Flame by Digital Holographic Interferometry using Volume Phase Holographic Grating
Authors: Rastogi Vivek , Agarwal Shilpi , Dubey Satish Kumar , Khan Gufran Sayeed , Shakher Chandra
Published: November 2021

In this paper digital holographic interferometry system based on volume phase holographic grating is used to measure the temperature and temperature fluctuations in micro flame. The proposed system will have minimum speckle noise and free from stray light.
Interference enabled binary data encoding within broadband uniformly topologically charged terahertz beams
Authors: Tsiplakova Elizaveta G. , Kulya Maksim S. , Gorodetsky Andrei , Sokolenko Bogdan V. , Petrov Nikolay V.
Published: November 2021

This work demonstrates the encoding principle for wave trains consisting of interfering uniformly charged Laguerre-Gaussian terahertz beams carrying unitary and zero topological charges. Optimization of the receiving aperture and threshold for a binary encoding outcome is presented.
High-resolution multiple-aperture holographic imaging system
Authors: Yang Feng , Zhu Lei , Wei Kai , Zhang Yudong , Cao Liangcai
Published: November 2021

A multiple-aperture holographic imaging system and its data processing method are presented. A four-aperture imaging configuration is implemented. A high-resolution image is synthesized by the accurate co-phasing, improving the resolution by about 1.9 times.
Gradient-based Optimization of Time-Multiplexed Binary Computer-Generated Holograms by Digital Mirror Device
Authors: Yamamoto Kenta , Ochiai Yoichi
Published: November 2021

We propose a gradient-based optimization method for time-multiplexed binary holograms displayed on a digital mirror device. Optimized binary holograms can be used to reconstruct high-quality images.
Holographic Display with a Digital Micromirror Device (DMD) and Error Diffusion Algorithm
Authors: Jiao Shuming , Zhang Dongfang , Zhang Chonglei , Gao Yang , Lei Ting , Yuan Xiaocong
Published: November 2021

A modified error diffusion algorithm is proposed for encoding the binary pattern in a holographic display system based on DMD. The proposed method has better display quality than the previous superpixel method.
Multi-plane complex-amplitude holographic display based on band-limited double-phase method
Authors: Sui Xiaomeng , Cao Liangcai , Jin Guofan
Published: November 2021

A multi-plane complex-amplitude holographic display is implemented based on band-limited double-phase hologram. A high-sharpness reconstruction free of spatial-shifting noise is realized with the numerical band limitation and optical filtering.
Optical Scanning Holography – A Tutorial and an Overview of Recent Advances
Authors: Poon Ting-Chung
Published: November 2021

Optical scanning holography (OSH) is a single-pixel digital holographic recording technique. Applications of the technique include optical scanning cryptography, 3-D microscopy, 3-D pattern recognition, 3-D holographic TV, and 3-D optical remote sensing. In this tutorial, I will first provide the basic principle of OSH. I will then give an overview of some of the recent advances that have been made on OSH.
Imaging of a deforming liquid droplet using phase-shifting burst digital holography
Authors: Ujiie Takumi , Ozawa Yuta , Hayasaki Yoshio
Published: November 2021

A deforming liquid droplet was imaged by the phase-shifting digital holography with the burst-imaging technique. It was implemented with a high-speed imager and a high-speed mirror scanning. The capturing time of a hologram was 460µs.
Underwater holographic descattering with synthetic polarization
Authors: Zhu Yanmin , Yeung Chok Hang , Lam Edmund Y.
Published: November 2021

We propose a novel digital holographic microscope system with synthetic polarization. It can obtain the light intensity of different polarization states in a single shot and achieve the descattering of underwater imaging through polarity calculation.
Crack detection in tableware items using digital holography interferometry
Authors: Pensia Lavlesh , Dwivedi Gaurav , Singh Omendra , Kumar Raj
Published: November 2021

Double exposure digital holographic interferometry is used for detection of cracks in tableware cup. Quantitative analysis is performed by 2-D profile and 3-D mesh plot of defects. Experimental results are validated by a mechanical profiler.
Space-time optical imaging framework: Holographic particle tracking velocimetry
Authors: Chen Ni , Wang Congli , Heidrich Wolfgang
Published: November 2021

We present a joint optimization framework for four-dimensional (4D) optical imaging: volumes and movements are reconstructed jointly in a higher space-time dimen- sion, enabling faster convergence and better reconstruction quality of both the volumes and movements within a few minutes on modern GPUs. We verified the framework on digital holographic particle tracking velocimetry, a typical 4D optical imaging example. Experi- mental results are presented to show the efficiency of the proposed technique.
Label-free video-rate micro-endoscopy through flexible fibers via Fiber Bundle Distal Holography (FiDHo)
Authors: Badt Noam , Katz Ori
Published: November 2021

State-of-the-art micro-endoscopes cannot perform three-dimensional imaging through dynamically-bent fibers in a compact footprint. We present a holographic 3D bend-insensitive, micro-endoscope that utilizes a miniature partially-reflecting distal mirror for full-field coherence- gated holography at diffraction limited resolution.
Multi-illumination single-holographic-exposure lensless Fresnel (MISHELF) microscopy using 4 channels
Authors: Sanz Martín , Picazo-Bueno José Ángel , Granero Luis , García Javier , Micó Vicente
Published: November 2021

MISHELF microscopy is generalized by considering 4 illumination/detection channels while retaining single-shot working principle, twin image mitigation and noise averaging. Proof of principle validation is included considering a resolution test target.
Reconstruct-to-refocus: joint reconstruction of a biological sample and of calibration objects for accurate auto-focusing in digital holography
Authors: Brault Dylan , Berdeu Anthony , Soulez Ferréol , Momey Fabien , Olivier Thomas , Denis Loïc , Fournier Corinne
Published: November 2021

We propose to reconstruct biological samples using calibration beads to perform numerical autofocusing in in-line holographic microscopy. The approach is based on a joint inversion using both a parametric and a regularized inversion method.
COACH-based Shack-Hartmann wavefront sensor
Authors: Dubey Nitin , Kumar Ravi , Rosen Joseph
Published: November 2021

A new Shack-Hartmann wavefront sensor (SHWS) based on the principle of coded aperture correlation holography is used to achieve higher precision. Coded phase masks are employed to create sparse dot patterns in the sensor plane.
Quantification of Nanoparticle-mediated Alterations in Histological Tissue Sections Utilizing Quantitative Digital Holographic Phase Microscopy
Authors: Ntovas Angelos , Barroso Álvaro , Eder Kai , Vennemann Antje , Wiemann Martin , Schnekenburger Jürgen , Kemper Björn
Published: November 2021

We explored the capabilities of quantitative digital holographic phase microscopy to quantify nanomaterial-induced morphological alterations in unstained histological tissue sections by determination of refractive index changes.
Binary-Phase Computer-Generated Holography using Hardware-in-the-loop Feedback
Authors: Kadis Andrew , Mouthaan Ralf , Dong Daoming , Wang Youchao , Wetherfield Benjamin , El Guendy Miguel , Wilkinson Timothy D.
Published: November 2021

We combine a continuous feedback hardware-in-the-loop approach with a binary-phase SLM and an imaging sensor to produce a computer-generated holography system which is scalable in cost, tolerant to real-world effect and suitable for mass-market adoption.
Structured Light: Engineering the Phase and Amplitude of Light in a Simple Medium
Authors: Aborahama Yousuf , Mojahedi Mo
Published: November 2021

Using a concise analytical approach, we design and generate optical fields with arbitrarily chosen amplitude and phase in three dimensions inside a simple medium devoid of sources. The proposed approach was experimentally verified.
Extending recordable time of motion picture of magnified image of a propagating light pulse by digital light-in-flight holography
Authors: Inoue Tomoyoshi , Nishio Kenzo , Awatsuji Yasuhiro
Published: November 2021

We proposed a technique to extend a recordable time of motion picture of a magnified image of a propagating light pulse. We succeeded in extending the recordable time up to about 1.8 times.
Molecular Gas Sensing in the Near Infrared using Digitally Enhanced Dispersion Spectroscopy
Authors: Wong Justin , Bandutunga Chathura P. , Zhang Ya , Gray Malcolm B. , Chow Jong H.
Published: November 2021

A frequency and intensity noise immune fiber dispersion spectrometer with a digitally enhanced homodyne phase extraction system is presented. It is used to interrogate the anomalous dispersion of Hydrogen Cyanide (H13CN) in the near-infrared.
Photothermal Monitor for Black Carbon Mass Concentration using a Fiber-Coupled Fabry-Perót Interferometer
Authors: Radeschnig Ulrich , Knoll Markus , Lang Benjamin , Bergmann Alexander
Published: November 2021

We present a concept for a miniaturizable black carbon monitor based on a fiber-coupled Fabry-Pérot interferometer. By means of photothermal excitation, we reach a limit of detection as low as 13 µg/m³.
Porous Silica Enrichment Films on Integrated Waveguides for Broadband Mid-IR Spectroscopic Trace Analysis
Authors: Baumgartner Bettina , Beneitez Nuria Teigell , Missine Jeroen , Radosavljevic Sanja , Wacht Dominik , Roelkens Gunther , Lendl Bernhard
Published: November 2021

Germanium-on-Silicon waveguide chips coated with functionalized mesoporous silica were used for evanescent wave sensing of organic contaminants in gas and aqueous phase. Low ppm level LODs and fast response times pave the way for in-line monitoring.
28 km Open Path Dual-Comb Spectroscopy
Authors: Cossel K. C. , Giorgetta F. R. , Baumann E. , Swann W. C. , Coddington I. , Newbury N. R.
Published: November 2021

Dual-comb laser absorption spectroscopy is demonstrated over a 28 km open path over an urban environment. Path averaged concentrations of CO2, H2O and CH4 are retrieved despite significant turbulence induced link loss.
Libraries of Infrared Reflectance Spectra of Solid Materials for in situ and Standoff Sensing
Authors: Johnson Timothy J. , Tonkyn Russell G. , Smith Steven C. , Bradley Ashley M. , Loring John S. , Banach Catherine A. , Saunders Danielle L. , Szecsody James E. , Myers Tanya L.
Published: November 2021

We present an overview of solids reflectance spectra that report quantitative reflectance spectra between 1.3 and 16 µm of both natural and anthropogenic materials. The spectra can be used for myriad applications.
A wide-field high-throughput Hyperspectral Microscope based on an Ultrastable Common-Path Interferometer
Authors: Ardini B. , Valentini G. , Bassi A. , Candeo A. , Cerullo G. , Vanna R. , Comelli D. , Manzoni C.
Published: November 2021

We introduce a Fourier-transform hyperspectral microscope based on an ultrastable interferometer. It enables wide-field acquisition with broad spectral coverage, tunable spectral resolution and high sensitivity. We provide examples of applications for fluorescence and Raman imaging. © 2021 The Author(s)
Analysis of the Signal-to-Noise Ratio in a static Fourier Transform Spectrometer
Authors: Kozia Christina , Giebeler Carsten
Published: November 2021

Static FTIRs have facilitated an accurate and cost-effective spectroscopy in harsh industrial applications. Here we present a technique applied on the raw image which increases the SNR after the calibration of the device.
Partially Coherent Modelling of Few-Mode Post-Dispersed Fourier Transform Spectrometers
Authors: Lap Bram N.R. , Jellema Willem , Withington Stafford , Naylor David A.
Published: November 2021

Post-dispersed Fourier transform spectrometers are prime candidates for up- coming far-infrared space telescopes, which achieve background limited spectral sensitivity by few-mode detectors. Straylight effects in such hybrid systems are investigated using a partially coherent modelling technique.
Skin Temperature From IASI: Extreme Events And Urban Heat Islands Monitoring
Authors: Safieddine Sarah , George Maya , Clarisse Lieven , Whitburn Simon , Clerbaux Cathy
Published: November 2021

in this work, we investigate the skin temperature product from IASI to look at local changes at the city and regional scales and to assess temperature over a period of 13 years.
Technique for Stabilizing a Spectrograph 1000x Using an Interferometer with Crossfaded Delays
Authors: Erskine David J.
Published: November 2021

By weighting signal components from at least two overlapping delays in an externally dispersed interferometer one can reduce by about 1000x the net shift in response to a wavelength drift in the disperser.
Design of a High-resolution Static Fourier Transform Spectrometer on Thin-film Lithium Niobate Substrate
Authors: Qi Zhi-mei , Zhang Lichao , Xue Ning
Published: November 2021

When a miniature static Fourier Transform spectrometer is prepared by using a thin- film lithium niobate electrooptic modulator instead of the conventional modulator with equal electrode length, its spectral resolution could increase at least 7 times.