bluuebunny/crossref_metadata_2025 huggingface dataset:
Quantification of Metabolic Function in the Retina Using Spectral Imaging and Phasor-FLIM
Authors: Geddes Daniel , Noorbakhsh Julia , Yang Zhiyuan , Preciado Miguel , Normand Margaret , Smith Kenneth , Harvey Andrew R.
Published: September 2022

High clutter and low signal mean that existing retinal-imaging techniques are not well suited to measuring retinal metabolism. We describe spectral/lifetime phasor measurement of fluorescent biomarkers as a route to routine assessment of retinal health.
Gigapixel-per-second, wide-field 3D topographic imaging with physics-supervised learning
Authors: Zhou Kevin C. , Harfouche Mark , Cooke Colin , Park Jaehee , Konda Pavan , Doman Jed , Reamey Paul , Saliu Veton , Zheng Maxwell , Horstmeyer Gregor , Horstmeyer Roarke
Published: September 2022

We present a new interleaved multi-camera microscope architecture and a physics-supervised multi-ocular stereo neural network that enable simultaneous photometric and 3D topographic imaging of freely-moving organisms over 135 cm2 at throughputs exceeding 5 gigapixels per second.
Theoretical optimization of electromechanical system to obtain uniform phase-steps for a dual-aperture common path interferometer with a gear system design
Authors: Barcelata-Pinzon A. , Bravo-Parra A. J. , Álvarez-Tamayo R.I. , Moreno-Guzmán J.A. , Rangel-Romero C. , Saldaña-González G. , Prieto-Cortés. P.
Published: September 2022

In this work, a mechanical optimization to generate uniforms spaced phase-shifts for extracting the phase difference between a reference and a probe object in a double aperture common path interferometer, is proposed. Analytical calculations and simulations of the mechanical gear system are shown. The transmission system was designed to increase the precision and control of the transverse translation of a diffraction grating in order to obtain homogenous phase-shifting.
Direct dual-comb imaging using a single electro-optic modulator
Authors: Escobar-Vera Camilo , Soriano-Amat Miguel , Moreno-Oyervides Aldo , Khan Farid Ullah , Bonilla-Manrique Oscar E. , Fernández-Ruiz María R. , Martín-López Sonia , Durán Vicente , González-Herráez Miguel , Martín-Mateos Pedro
Published: September 2022

We present a dual-comb imaging system that employs a single pseudo-randomly driven electro-optic modulator. The result is a simple, cost-efficient and robust instrument that can be exploited for spatially resolved spectral sensing.
Silicon-on-Insulator (SOI) Slot Waveguide for Methane Absorption Sensing in the Mid-Infrared
Authors: Yallew Henock Demessie , Vlk Marek , Datta Anurup , Alberti Sebastián , Høvik Jens , Aksnes Astrid , Greve Martin Møller , Jágerská Jana
Published: September 2022

We demonstrate SOI slot waveguides for highly sensitive on-chip detection of methane using tunable diode-laser absorption spectroscopy in the mid-infrared. 1.7 ppm limit of detection has been shown with a 1 cm long slot waveguide.
Adsorption of volatile organic compounds inside a nanoporous silica waveguide
Authors: Barua Nirmalay , Winter William T. , McAuley Serrita A. , Clarkson Paul T. , Prestage Joshua , Salmon Andrew R. , Hutter Tanya
Published: September 2022

Adsorption in complex nanoporous materials is important for many applications. We report a novel approach for measuring adsorption in situ that uses a nanoporous silica waveguide and near-infrared spectroscopy for selective measurement of adsorbed compounds.
High-Q Silicon-Germanium Ring Resonator for On-Chip Sensing Applications in the Mid-Infrared
Authors: Perestjuk Marko , Armand Rémi , Torre Alberto Della , Sinobad Milan , Mitchell Arnan , Boes Andreas , Hartmann Jean-Michel , Fedeli Jean-Marc , Reboud Vincent , Monat Christelle , Grillet Christian
Published: September 2022

We report a high-Q ring resonator in a silicon-germanium on silicon chip-based platform for sensing applications in the mid-infrared. The side-coupled ring exhibits a loaded Q-factor of 90,000 at the operating wavelength around 4.18 µm.
Design and Performance Characterization of a Portable, Frequency Comb-Calibrated, Laser Heterodyne Radiometer
Authors: Qiu Chenhui , Moreno-Oyervides Aldo , Bonilla-Manrique Oscar Elias , Martín-Mateos Pedro
Published: September 2022

We present the design and the initial performance characterization of a portable laser heterodyne radiometer for in-field operation featuring an optical frequency comb-calibrated frequency axis and dual-acquisition mode (traditional and wavelength modulation) capabilities.
Detection of Aerosols in the Bahamas during Saharan Dust Transport Times with a Laser and a CCD Imager
Authors: Kabir Amin S. , Sharma Nimmi C. P. , Gagnon Seth , Alcantara-Silva Marcus , Odhiambo George , Barnes John E.
Published: September 2022

A bistatic lidar system, comprising a continuous wave laser transmitter and a digital CCD camera detector, was used to detect suspended particulates over the Bahamas during times of active dust transport from the Sahara Desert.
Countering nonlinearity in digitization for precise dual-frequency comb spectroscopy.
Authors: Malarich Nathan A. , Cossel Kevin , Giorgetta Fabrizio , Baumann Esther , Mead Griffin , Herman Daniel I. , Washburn Brian R. , Newbury Nathan , Coddington Ian
Published: September 2022

In order to measure gas concentrations with sub-percent accuracy, we measure, simulate and propose solutions for removing analog to digital converter (ADC) imposed bias on the recorded interferograms in dual comb spectroscopy.
Broadband photothermal spectroscopy for gas sensing with two frequency combs
Authors: Wang Qiang , Wang Zhen , Zhang Hui , Jiang Shoulin , Wang Yingying , Jin Wei , Ren Wei
Published: September 2022

We demonstrate scan-free broadband photothermal spectroscopy for gas sensing. The gas refractive index is modulated by the multiheterodyne beating of two frequency combs and demodulated by an in-line Fabry‐Pérot interferometer fabricated by a hollow-core fiber.
Simultaneous standoff plume detection using a swept-ECQCL and passive hyperspectral imaging
Authors: Phillips Mark C. , Bernacki Bruce E.
Published: September 2022

Direct comparisons are made between an active laser-based swept-wavelength ECQCL and passive LWIR hyperspectral imager for dynamic chemical plume detection at a standoff distance of 1.5 km in complex terrain.
Ground-based remote sensing of greenhouse gases in the atmospheric column using laser heterodyne radiometers
Authors: Shen Fengjiao , Wang Jingjing , Wei Tingting , Tan Tu , Cao Zhensong , Gao Xiaoming , Jeseck Pascal , Te Yao-Veng , Dong Lei , Chen Weidong
Published: September 2022

Development of laser heterodyne radiometers operating in the near-IR near 1.5 µm and in the mid-IR near 8 µm for the measurements of CH4, N2O, 13CO2/12CO2, H2O/HDO vapor in the atmospheric column.
Supercontinuum-based Hyperspectral Sensor for Stand-off Identification of Black Plastics
Authors: Saleh Abba , Mekhrengin Mikhail , Dönsberg Timo , Kaariainen Teemu , Genoud Guillaume , Toivonen Juha
Published: September 2022

We report hyperspectral identification of black plastics using a novel sensor employing a MEMS-based Fabry-Pérot interferometer and a custom supercontinuum laser covering a part of the so called molecular fingerprint region at 3 – 3.5 µm.
A Comparative Study of Mid-Infrared Photothermal Spectroscopy with Different Fiber Interferometers
Authors: Hu Mengyuan , Yao Chenyu , Ventura Andrea , Hayashi Juliano Grigoleto , Poletti Francesco , Ren Wei
Published: September 2022

We report the stability comparison of mid-infrared photothermal spectroscopy using the in-fiber mode interferometer and Mach-Zehnder interferometer.
Mid-infrared Broadband Spectroscopy for Plasma Analysis
Authors: Krebbers R. , Liu N. , Jahromi K. E. , Nematollahi M. , Bang O. , Woyessa G. , Petersen C. R. , van Rooij G. , Harren F. J. M. , Khodabakhsh A. , Cristescu S. M.
Published: September 2022

We demonstrate the application of a home-built Fourier Transform Spectrometer based on a mid-infrared supercontinuum source for multispecies detection in a plasma reactor. The results show the high capability of the system for plasma analysis.
A single quantum cascade laser frequency comb Fourier transform spectroscopy by repetition rate tuning
Authors: Liu Jie , Wysocki Gerard
Published: September 2022

We demonstrate a moving-parts free, single frequency comb mid-infrared Fourier transform spectroscopy by combining electronic repetition rate sweeping of a quantum cascade laser with a multi-pass cell based interferometer.
Monolithic Integrated OLED–OPD Unit for Point-of-Need Nitrate Sensing
Authors: Titov Igor , Köpke Markus , Gerken Martina
Published: September 2022

Rapid, in-situ nitrate sensing in microfluidics is crucial for next-generation environmental and agricultural monitoring. We demonstrate an assay-based limit-of-detection of 55.6µM using (0.5mm)2 OLED and OPD devices fabricated on a single substrate for microfluidic integration.
Method for simple phase recovery and denoising in spectral imaging interferometry based on error-diffusion dithering
Authors: Taudt Christopher , Hartmann Peter
Published: September 2022

Dithering of spectral interferometric data helps to reduce intensity noise and improve fitting accuracy. A simple phase recovery method is developed using dithering to enhance measurement range in profilometry.
Development of automatic identification system for optical coherence tomography assisted pneumoperitoneum creation
Authors: Huang Eric Yi-Hsiu , Kao Meng-Chun , Kuo Wen-Chuan
Published: September 2022

This study proposes an algorithm for determining the exact location of the needle tip through the acquisition of OCT images in order to eliminate operator variation in image judgment, thus improving peritoneal access safety.
Video From Coded Motion Blur Using Dynamic Phase Coding
Authors: Yosef Erez , Elmalem Shay , Giryes Raja
Published: September 2022

We present a method for video reconstruction of the scene dynamics from a single image using coded motion blur. Our approach addresses the limitations of the ill-posed task and utilizes a learned optical coding approach.
Light Field Local Surface Feature Detection
Authors: He Di , Liu Chang , Qiu Jun
Published: September 2022

A light field local surface features detection method is proposed based on the scale space established on the moving frame determined by the depth information. Experimental results show more detected features than SIFT and LiFF.
Dual-wavelength comb-swept laser to solve distance aliasing for multi-layer measurement
Authors: Bak Seongjin , Kim Gyeong Hun , Jang Hansol , Kim Chang-Seok
Published: September 2022

In this research, we have proposed a dual-wavelength comb-swept laser and optical Vernier sampling technique for multi-layer measurement. With the proposed measurement system, we can measure multi-layer targets without distance aliasing.
Angular Resolution Variable FMCW LiDAR with Acousto-Optic Deflector
Authors: Jeong Dawoon , Jang Hansol , Jung Min Uk , Kim Chang-Seok
Published: September 2022

Angular resolution variation with adaptive beam scanning of frequency-modulated continuous wave (FMCW) LiDAR was implemented using an acousto-optic deflector. Various beam scanning patterns were applied over 3 degrees of field of view.
FMCW LiDAR Using Dual Interferometer for Improving Distance Measurement
Authors: Jung Min Uk , Kim Gyeong Hun , Jeong Dawoon , Kim Huiyeon , Kim Chang-Seok
Published: September 2022

Frequency-modulated continuous wave (FMCW) system was implemented using dual interferometers with two different optical delay lengths. This system can overcome the limitation of the distance measurement range due to the coherence length of the light source.
High resolution Hong-Ou-Mandel microscope for depth imaging
Authors: Torre Cyril , McMillan Alex , Matthews Jonathan C.F.
Published: September 2022

We demonstrate the use of Hong-Ou-Mandel interference to resolve < 10µm scale depth-features of a semi-transparent sample and incorporate confocal imaging for 3D microscopy using photons from a wavelength-entangled pair photon source.
Multi-scale Aberration Corrected Imaging of the Retina
Authors: Terry Joel , Santacana Guillem Carles , Harvey Andy
Published: September 2022

Multi-scale imaging promises wide-field imaging of the retina with a space-bandwidth product that approaches the Fresnel limit. We describe an implementation that achieves 10× improvement in the space-bandwidth product compared to current retinal imaging systems.
Polarization Imaging and Orientation Mapping in Dual-color Super-resolution Microscopy
Authors: Ryan Duncan P , Dunlap Megan K , Majumder Somak , Hollingsworth Jennifer A , Gelfand Martin P , Werner James H , Van Orden Alan K , Goodwin Peter M
Published: September 2022

We present a super-resolution microscopy method that measures the polarization state and spectral signature of single-molecules. The emission behavior of coupled quantum dots is investigated using this method.
Pixels2Pose: Super-Resolution Time-of-Flight Imaging for 3D Pose Estimation
Authors: Ruget Alice , Tyler Max , Mora-Martín Germán , Scholes Stirling , Zhu Feng , Gyongy Istvan , Hearn Brent , McLaughlin Steve , Halimi Abderrahim , Leach Jonathan
Published: September 2022

The process of tracking human anatomy in computer vision is called pose estimation. It traditionally requires advanced equipment. We develop a system that estimates the 3D poses of people from a cost-effective and compact time-of-flight sensor.
Time-domain nonlinear microscopy of biological tissue
Authors: Ganikhanov Feruz
Published: September 2022

Detection of time-domain replica of Raman active vibrations for previously unresolved vibrational signatures lines within fat cells is demonstrated. We identify tissue constituents and perform dephasing time (T2) measurements of the characteristic Raman active vibrations.
Beyond the Quantum Optical Diffraction Limit
Authors: Ribak Erez N. , Gumpel Gal
Published: September 2022

To circumvent Heisenberg’s uncertainty principle, we multiplied the number of white light photons using a dye. With larger wave-packets, the resolution is improved, as if with a larger aperture, but longer integration times are necessary.
Spatial frequency domain imaging (SFDI) method for characterizing surgical wound sites
Authors: Zhang Lai , Bounds Alistair D. , Fleming James P. , Girkin John M.
Published: September 2022

We apply Monte Carlo simulation to obtain the diffuse reflectance for a surgical wound model with experimental validation. The SFDI resolution in detecting wound structure change are found dependent on scattering coefficient and wound width.
Phase contrast imaging with meta-optics
Authors: Wesemann Lukas , Rickett Jon , Song Jingchao , Lou Jieqiong , Hinde Elizabeth , Davis Timothy J. , Roberts Ann
Published: September 2022

The visualization of transparent objects in real-time using ultracompact optical systems remains an ongoing challenge. Here we present metasurfaces that convert phase variations in a wavefield to intensity to create a pseudo-3D image of a phase object.
Numerical Investigation of Solar Noise Effects on Flash Lidar Systems for different visibility conditions
Authors: Chang Hanbyul , Kim Hansol , Lee Chaeyoung , An Haechan , Jeong Yoonchan
Published: September 2022

This study analyses the solar noise effects on flash lidar systems for several visibility conditions. The Monte-Carlo radiative transfer method is used for the signal to noise ratio (SNR) calculation, and it is confirmed that the solar noise has adverse effects on the operation of the systems, giving rise to about 3 - 5 dB decrease in SNR.
Fast and high-resolution Correlation Plenoptic Imaging between Arbitrary Planes
Authors: Di Lena F. , Vasiukov S. , Scattarella F. , Massaro G. , Giannella D. , Pepe F.V. , D’Angelo M.
Published: September 2022

We present a novel approach to Correlation Plenoptic Imaging (CPI), named CPI between arbitrary planes. This approach allows a tridimensional reconstruction of the scene around two distinct arbitrary planes conjugate to the correlated sensors.
Fast Mid-Infrared Spectroscopic Imaging for Painted Cultural Heritage
Authors: Charsley Jake M. , Rutkauskas Marius , Altmann Yoann , Botticelli Michela , Risdonne Valentina , Smith Margaret , Visser Tess , Young Christina R.T. , Reid Derryck T.
Published: September 2022

Full-field imaging for non-invasive spectral analysis of pigments in painted cultural heritage is demonstrated from 1400–700cm-1. Acquisition without compressive sensing takes 4 minutes, with a further 2 minutes needed for spectral reconstruction and clustering.
Ultrafast Live 3D Imaging with 25-plane Camera Array Multifocus Microscopy
Authors: Hirata-Miyasaki Eduardo , Pettersson Gustav M. , Bajor Antone , Fouke Kaitlyn , John Demis D. , Thibeault Brian , Haspel Gal , Morgan Jennifer , Abrahamsson Sara
Published: September 2022

We demonstrate a novel ultrafast Multifocus 25-camera-array microscope (M25) for truly simultaneous high-resolution 3D imaging of 25 focal planes. Customized for functional neural circuit imaging, our M25 microscope captures 130× 130× 50um3 volumes at >100Hz.
Laser-Induced Tunable Focusing in Semiconductors
Authors: Shabairou Nadav , Zalevsky Zeev , Sinvani Moshe
Published: September 2022

We demonstrate a novel method for focusing a probe IR pulse laser beam in semiconductors. The shaping was done by a temporaly modifying the material complex refractive index by a second pulse pump laser beam absorbed in the sample, using pump-prob experiment.
Automated design of freeform off-axis three-mirrors-anastigmat
Authors: Héron S. , Semet Y. , Barrère R. , Lee M.-S.-L. , Loiseaux B.
Published: September 2022

A fully automated method to optimize visible freeform telescope based on CMA-ES algorithm is presented. It only requires the optical designer to translate the specifications as an objective function and use any naive starting point.
Characterization of the Printing System Modulation Transfer Function Based on Edge Profile Fitting
Authors: Ivanda Katarina Itrić , Modrić Damir
Published: September 2022

Generating reliable MTF function of the printing system provides insight into the future reproduction of the imprint. In this regard, it is necessary to determine the appearance of the edge of the print as accurately as possible.
Evaluating Spectroscopic Data Fusion for Environmental Conditioning of Lithium Hydride Using Machine Learning
Authors: Pinson Ryan E. , Jenkin Phillip R. , Giminaro Andrew V. , Patnaik Anil K.
Published: September 2022

Using LIBS and Raman spectroscopy, LiH reactions with moisture and temperature are known. Humidity and temperature condition were studied using multivariate modeling. These resulting defects were used to characterize the environments of these reactions.
Compact Borescope Design for 2D Long-Wavelength IR (LWIR) Thermal Imaging Sensing
Authors: Chen Trevor B. , Hsu Paul S.
Published: September 2022

A compact and small borescope is designed to achieve high-spatial resolution, high-fidelity LWIR thermal imaging of 2D surface temperature in gas-turbine engines, providing the desired engine component temperature distribution and heat flux information.
Au coated Femtosecond Laser based patterned non-stoichiometric Silicon Nitride films as SERS substrate
Authors: Malik Pariksha , Awasthi Vimarsh , Goel Richa , Ghosh Santanu , Dubey Satish Kumar , Srivastava Pankaj
Published: September 2022

Non-stoichiometric silicon nitride films were fabricated using PECVD technique and patterned by a femtosecond laser, with a uniform gold film of 10nm thickness deposited over it by sputtering technique to explore its potential as SERS substrate.
Ultrafast Bessel Beam Induced Finger-like Silver Nanostructures for Trace-level Picric Acid Sensing
Authors: Banerjee Dipanjan , Beeram Reshma , Soma Venugopal Rao
Published: September 2022

We fabricated quasi-periodic arrays of finger-like three-dimensional nanostructures on a silver target by engaging picosecond Bessel laser pulses. Subsequently, trace-level, real-time sensing of an explosive molecule of picric acid was achieved using SERS technique.
Measurement Precision of fs/ps Coherent Anti-Stokes Raman Scattering for Low-Pressure Applications
Authors: Braun Erik L. , Athmanathan Venkat , Slipchenko Mikhail N. , Meyer Terrence R.
Published: September 2022

Uncertainty analysis was performed for kHz-rate hybrid femtosecond/picosecond rotational coherent anti-Stokes Raman scattering thermometry. A high-energy probe pulse and simultaneous nonresonant background acquisition improved the precision of the technique for low-pressure applications.
Simultaneous Detection of NO, O, and O2 Using a Single Broadband Femtosecond Laser Source
Authors: Hay Matthew , Parajuli Pradeep , Kulatilaka Waruna D.
Published: September 2022

Simultaneous NO-LIF, O-TPLIF, and O2-LIF were demonstrated in a flame using a single broadband femtosecond laser. 1D images show species distribution at the flame edge. Equivalence ratio scans agreed with equilibrium calculations and previous measurements.
Laser Source Power Enhancement for Remote Methane Sensing Applications
Authors: Soskind Michael , Kaczmarek Paweł , Abramski Krzysztof , Wysocki Gerard
Published: September 2022

We present on methods for enhancing the output power of narrow-linewidth laser sources for use in applications such as methane sensing at 1650 nm using Raman amplifiers, semiconductor optical amplifiers, and coherent beam combining.
Room temperature detection of N2O using a resonant cavity mid-IR detector and interband cascade LED
Authors: Li N. P. , Tao L. , McSpiritt J. , Zondlo M. A. , Jackson E. M. , Kim M. , Kim C. S. , Canedy C. L. , Merritt C. D. , Bewley W. W. , Nolde J. A. , Aifer E. H. , Vurgaftman I. , Meyer J. R.
Published: September 2022

We achieved a detection limit of 400 ppmv N2O (5.5× 10
−
5 absorbance) at 19 °C and 4.0 µm, using emission from an interband cascade light-emitting device (ICLED) in combination with detection by a resonant cavity IR detector (RCID). These results demonstrate the feasibility of combining ICLEDs and RCIDs on a single mass-produced chip for optical gas sensing.
Remote detection using maximal coherence control technique in coherent anti-Stokes Raman spectroscopy
Authors: Chathanathil Jabir , Liu Gengyuan , Malinovskaya Svetlana
Published: September 2022

A theoretical framework for the remote detection of molecules is presented in which a quantum control technique, determined to maximize the vibrational coherence in coherent anti-Stokes Raman spectroscopy, is used to optimize the backscattered signal from a cloud of molecules.
High-Resolution Dual-Comb Spectroscopy in the Range 2–12 µm Based on Fully Referenced Cr:ZnS Laser Combs
Authors: Vasilyev Sergey , Smolski Viktor , Peppers Jeremy , Mirov Mike , Moskalev Igor , Barnakov Yury , Muraviev Andrey , Vodopyanov Konstantin , Mirov Sergey
Published: September 2022

Optical frequency combs based on mode-locked Cr:ZnS lasers uniquely combine multi-octave bandwidth, high brightness, and compactness. We demonstrate spectroscopy with dual Cr:ZnS combs accessing 800,000 comb teeth spanning 2000 cm–1 in the middle-IR.
Laser-Based Sensor for Combustion Diagnostics in Mid-Infrared 11.56 ─ 15 μm
Authors: Elkhazraji Ali , Shakfa Mohammad Khaled , Adil Mohammad , Mhanna Mhanna , Jin Hanfeng , Marangoni Marco , Giri Binod , Farooq Aamir
Published: September 2022

We present a new sensor based on a widely tunable difference-frequency-generation light source emitting in the mid-infrared. We applied this sensor to probe benzene (C6H6) and hydrogen cyanide (HCN) in reactive environments at combustion-relevent conditions.
An Air-spaced Virtually Imaged Phased Array Spectrometer Based on a Mid-Infrared Optical Frequency Comb
Authors: Sadiek Ibrahim , Lang Norbert , van Helden Jean-Pierre H.
Published: September 2022

We report on the first air-spaced VIPA spectrometer using a mid-infrared frequency comb, which fully resolves the modes of a 250 MHz comb without filtering. The spectrometer is tested by measuring CH4 in nitrocarburizing plasmas.
Hydrogen Atom Imaging in High-Pressure Flames Using Femtosecond Two-Photon LIF
Authors: Parajuli Pradeep , Wang Yejun , Hay Matthew , Kulatilaka Waruna D.
Published: September 2022

We demonstrate hydrogen (H) atom imaging in high-pressure (1–10 bar) methane-air flames using a home-built, high-conversion-efficiency, direct-frequency-quadrupled fs laser system. The effects of laser energy, excitation wavelength, equivalence ratio, and pressure are discussed.
Elastic Light Scattering Measurements from Orbital Angular Momentum Laser Beams
Authors: Sivaprakasam Vasanthi , Hart Matthew B. , Lindle Ryan , Winkler Paul , Watnik Abbie
Published: September 2022

The angular elastic scattering signal intensity is measured from suspended single particles and a population of particles for laser beams that carry orbital angular momentum and is compared to that of a Gaussian beam.
Temperature distribution in granular assemblies using luminescence thermometry and radiative transfer simulation
Authors: Xuan Guangtao , Ebert Mirko , Rodrigues Simson Julian , Lessig Christian , Vorhauer-Huget Nicole , Fond Benoît
Published: September 2022

An optical method for multi-point temperature measurements inside granular assemblies is proposed. Signals originating from distinct thermographic phosphor-coated particles exiting the bed are separated using a linear least square method.
Progressing laser spectroscopic methods as future Optical Gas Standards
Authors: Petersen Jan C. , Werhahn Olav
Published: September 2022

Laser spectroscopy providing direct SI-traceable amount fraction, realized by Optical Gas Standards, complement gaseous reference materials. The method needs to be propagated into calibration and measurement capabilities. This paper highlights anchor points to this route.
Prism-based Cavity Enhanced Absorption Spectroscopy for Broadband Trace Gas Sensing
Authors: Wang Gaoxuan , Cui Ruyue , Yalin Azer , Meng Lingshuo , Gou Qian , Coeur Cécile , Dong Lei , Chen Weidong
Published: September 2022

We report on the recent development of a novel optical cavity based on prisms as cavity reflectors, which offers a high-finesse optical cavity operating in a broadband spectral region from 400 to 1600 nm.
Analysis of Phase-Controlled Fourier Transform Spectroscopy Operation in the Mid- and Far-Infrared
Authors: Thurmond Kyle D. , Bowlan John M.
Published: September 2022

Phase-controlled Fourier transform spectrometer is evaluated for extended bandwidth in the far-infrared. Combustion diagnostics targets this region for the rich spectra it contains. Ray tracing is used to evaluate sensitivity to alignment and bandwidth scaling.
Investigation of a flame in a packed bed using a cylindrical geometry and single-side optical diagnostics
Authors: Khodsiani Mohammadhassan , Beyrau Frank , Fond Benoit
Published: September 2022

The interaction of a flame and a two-dimensional packed bed is studied by a combination of optical techniques applied along a single optical access, which includes telecentric chemiluminescence imaging, laser doppler anemometry and phosphor thermometry.
Optical spectroscopic tools for standoff uranium detection
Authors: Harilal Sivanandan S. , Kautz Elizabeth J. , Phillips Mark C.
Published: September 2022

Rapid and standoff analysis of uranium is important to many applications. We present the recent advances in standoff detection of uranium using emission and laser-induced fluorescence spectroscopy in conjunction with ultrafast laser filament ablation-based solid sampling.
Raman Spectroscopy Characterization of Nuclear Materials and Soot from High Explosives
Authors: Villa-Aleman Eliel , Darvin Jason R. , Dick Don D. , Christian Jonathan H. , Foley Bryan J. , Wellons Matthew S. , DeVore Michael A.
Published: September 2022

Vibrational and luminescence spectroscopy were used in the investigation of U and Pu-bearing compounds and soot from high explosives testing. Key spectroscopic signatures of UF4 and its hydrates, PuO2, and soot from different explosives will be presented.

The United States Government retains and the publisher, by accepting this article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.
MHz rate Flow Diagnostics in a Hypersonic Boundary Layer
Authors: Jiang Naibo , Hsu Paul S. , Slipchenko Mikhail , Roy Sukesh , Lauriola Daniel K. , Webb Austin M. , Meyer Terrence R. , Gragston Mark , Parker Ron , Portoni Phillip , McDemortt Conor , Wadhams Timothy P.
Published: September 2022

MHz-rate Nitric Oxide Planar Laser-Induced Fluorescence (NO PLIF) imaging and MHz-rate Focused Laser Differential Interferometry (FLDI) were performed in hypersonic boundary layer at CUBRC 48” Mach 10 shock tunnel.
Dry Aerosol Plasma-Particle Interactions in fs-Laser Filaments for Atmospheric Sampling
Authors: Latty Kyle S. , Hartig Kyle C.
Published: September 2022

Atmospheric dry aerosol plume interactions with fs-laser filaments are compared to ns-pulses and short-focused (SF) fs-pulses. Spatiotemporal dependencies of dry nanoparticle sampling in air are determined using optical spectroscopy and imaging between the three cases.
Recent advances in quartz-enhanced photoacoustic spectroscopy for environmental monitoring applications
Authors: Giglio Marilena , Zifarelli Andrea , Menduni Giansergio , De Palo Raffaele , Di Gioia Michele , Sampaolo Angelo , Patimisco Pietro , Spagnolo Vincenzo
Published: September 2022

Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) has become a gas sensing leading-edge technology thanks to multi-species detection, modularity, ruggedness, portability, and real time operation. In this work, recent applications of QEPAS-based sensors for environmental monitoring are reviewed.
H2S detection in complex gas matrices
Authors: Sampaolo A. , Olivieri M. , Menduni G. , Zifarelli A. , Giglio M. , Patimisco P. , Spagnolo V.
Published: September 2022

We report on two quartz-enhanced photoacoustic sensors for H2S trace detection in natural gas leaks. The challenge for these two spectroscopic approaches consists in avoiding methane interference and detect hydrogen sulfide at the sub-ppm level.
Cantilever-enhanced Photoacoustic Detector for Light-absorbing Aerosols
Authors: Karhu Juho , Kuula Joel , Virkkula Aki , Timonen Hilkka , Vainio Markku , Hieta Tuomas
Published: September 2022

We present here the first application of cantilever-enhanced photoacoustic spectroscopy for aerosol absorption measurements. A noise equivalent absorption of 1.3x10-10 cm-1 (one standard deviation) is reached with 20 s sampling time.
Experimental Analysis on the Effect of High Order OAM on the Scintillation of Asymmetric Perfect Vortex Beams
Authors: Vanderschaaf Liam , Cox Michael , Miller J. Keith , Johnson Eric G. , Watkins Richard J.
Published: September 2022

Scintillation results through a turbulence generator for high order (up to ±20) Asymmetric Perfect Vortex beams are presented. Analysis of the corresponding scintillation surfaces are also provided.
Predicting Deep Atmospheric Turbulence Using a Deep Echo State Neural Network
Authors: DeAntonio Michael , Wilson Jacob
Published: September 2022

A Deep Echo State Network (DeepESN) is applied to deep atmospheric turbulence. This network demonstrates a satisfactory prediction performance. Current Brier Skill Scores are around 30/100. Final results will be reported at the conference.
A Physics-Guided Machine Learning Model for the Prediction of Atmospheric Refraction
Authors: Al-Younis Wardeh , Sandoval Steven , Voelz David , Abdullah-Al-Mamun Mohammad
Published: September 2022

Image feature shifts due to atmospheric refraction are predicted with a finite difference machine learning method based on physics-infused modeling and data-driven training using time-lapse imagery. The model’s performance is compared with a previous approach.
Imaging Techniques Through Unfavorable Media
Authors: Tahtali Murat
Published: September 2022

This is a review style paper on the work done at UNSW Canberra on various imaging techniques to overcome transmission media limitation. First, we describe the problem of imaging through a medium, then look at possible ways of removing adverse effects. In this endeavor, temporal and spatial redundancies and diversities are key to achieving the retrieval of a latent image. Be it an astronomical observation or a reconstructed internal organ, the end goal is to reconstruct a likeness of the original object with as much fidelity as available from the often-incomplete imaging data. In the case of temporal redundancies and diversities, the reconstruction method relies on the acquisition of successive images of the same object subject to the variations in the transmission medium, whilst assuming that the object remains static and that the only variations are caused by the medium. The reconstruction is then a matter of modelling the statistics of the variations and factoring them out. An alternative to this approach is to exploit the spatial redundancies and diversities offered by a light field imaging system, where the image of the object can be simultaneously acquired from slightly different directions and different focus. Light field imaging is in fact a type of Shack-Hartmann wavefront sensor with more pixels. This lends itself to imaging through atmospheric turbulence and imaging through wavy water surfaces.
Outer Length Scales in Nocturnal Stable Boundary Layers
Authors: Basu Sukanta
Published: September 2022

Recently, Basu and Holstlag (2021) proposed a unified f ramework f or describing outer length scales (OLS). By utilizing this framework, we document various characteristics of OLS in nocturnal boundary layers over the US Great Plains.
Turbulence Kinetic Energy dissipation rate estimated from clear air radar data: comparisons of models in light of DataHawk UAV measurements
Authors: Luce Hubert , Kantha Lakshmi , Hashiguchi Hiroyuki , Doddi Abhiram , Lawrence Dale , Yabuki Masanori
Published: September 2022

TKE dissipation rate can be estimated from VHF/UHF Doppler radars. The currently used model for stably stratified conditions seems to be challenged by comparisons with UAV measurements. An alternative model derived for weakly stable conditions (Basu and Holtslag, EFM, 21, 1273, 2021) provides better agreements for shear-generated turbulent layers.
Investigation of transmission over the sea using a boundary layer scintillometer
Authors: Sprung Detlev , Sucher Erik , van Eijk Alexander M.J. , Stein Karin
Published: September 2022

Long-term Boundary Layer Scintillometer (BLS) turbulence measurements were performed over the Baltic Sea and statistics are presented. The BLS was also used as a transmissometer and its performance was compared to a commercial visibility meter.
Comparison between Turbulence Measurements from Anemometry, Optical, and Gradient Techniques
Authors: McCrae Jack , Bose-Pillai Santasri , Wilson Benjamin , Keefer Kevin , Fiorino Steven
Published: September 2022

In this paper we compare results between three different turbulence measurement or estimation techniques. These approaches are: sonic anemometry; the MZA Path Resolved Optical Profiling System (PROPS); and a gradient technique using temperature and wind.
The impact of optical turbulence created by Rayleigh Benard convection on vortex structure in beams carrying orbital angular momentum
Authors: Avramov-Zamurovic Svetlana , Judd K. P. , Matt S. , Handler R. A. , Watnik A. T.
Published: September 2022

We simulate Rayleigh Benard natural convection in air and propagate Gaussian Laguerre beams with varying topological charge through it. We present the impact of the optical turbulence on the phase and intensity of the beams.
The Polarization State Effect on the Performance of E-O Imaging Sensors at Atmospheric Degraded Environment
Authors: Ronen Ayala , Agassi Eyal , Yaron Ofer
Published: September 2022

Foggy and cloudy conditions, are considered to be a serious problem for the assimilation of the use of LIDAR and imaging sensors into autonomous mobile platforms. Our work explores, both theoretically and experimentally, how the consideration of the polarization state affects the performance of such systems for autonomous platforms in low visibility conditions.
Insight to atmospheric turbulence through irradiance measurements
Authors: Mahon Rita , Ferraro Mike S. , Moore Christopher I. , Rabinovich William S.
Published: September 2022

Probability density functions are routinely applied to represent the variations expected on an optical beam that has propagated through the atmosphere. Here we look at irradiance data acquired on a 16 km range across the Chesapeake Bay.
Fast and hydrosensitive switching of plasmonic nanocavities via photothermal effect
Authors: Chen Fangqi , Liu Yong , Ding Tao
Published: September 2022

Metallic nanoplasmonics, due to its extremely small size and ultrafast speed, has been one of the key components for next-generation information technology. It is vital that the highly tunable nanoplasmonic system in the solid state can be achieved for optoelectronic devices, which, still remains elusive for the visible region. Here we sandwich vanadyl oxalate (

VOC

2

O
4

) thin films in-between gold nanoparticles and gold film to establish thermo-responsive nanoantennas. The thickness of the

VOC

2

O
4

composite films remains almost unchanged within the temperature cycles between 15°C and 80°C, while the refractive index of the films decreases with the increase of temperature due to the dehydration, which results in blueshift of the plasmon peak up to 60 nm. The plasmon resonances can be fully recovered when the temperature cools down again. This process is reversible within the temperature range of 15°C–80°C, which can be optically modulated with photothermal effect. Such thermo-responsive plasmonic nanoantenna works in the solid state with hundreds of kilohertz switching speed, which is highly compatible with traditional optoelectronic devices. It can be envisioned that this thermo-responsive optical thin film can be a promising candidate for integrated nanoplasmonic and optoelectronic devices.
Integration of Diagnostic Fiber Bragg Grating Sensors in Advanced Carbon Composite Materials
Authors: Tozzetti L. , Gabardi M. , Faralli S. , Solazzi M. , Rajbhandari S. , Benedetti D. , Buttaro G. , Di Pasquale F.
Published: September 2022

FBG sensors written by femtosecond laser pulses are embedded in carbon composite structures. A comparative analysis, supported by theory, points out the embedding process repeatability and the sensing technology effectiveness for structural health monitoring.
In-core Temperature Forecasting by Random Forest Modeling in Extreme Harsh Environment
Authors: Wu Jingyu , Wang Mohan , Zhao Kehao , Cao Rongtao , Carpenter David , Zheng Guiqiu , Rountree Steven Derek , Chen Kevin P.
Published: September 2022

This paper proposed accurate in-core distributed temperature predictions by random forest modeling based on optical measurements. The prediction error is within 3.6% of the temperature swing in the extremely harsh environment.
Fiber-optic Fabry-Perot water penetration sensors using MT optical connector and spacer
Authors: Kihara Mitsuru , Ohira Masato , Arima Yusuke , Kikuchi Fuka
Published: September 2022

We investigate return loss characteristics of fiber-optic Fabry-Perot sensors that utilize optical connectors and a space. Experimental results demonstrate that fiber-optic Fabry-Perot sensor with a paper can be effective for sensing water penetration.
Towards gas sensing without spectroscopy using mid-infrared optical parametric oscillators
Authors: Zhou Selina , Gray Robert , Liu Mingchen , Roy Arkadev , Marandi Alireza
Published: September 2022

We introduce a method for gas sensing without performing direct spectrum measurement using broadband mid-infrared optical parametric oscillators, and experimentally demonstrate proof-of-concept carbon dioxide sensing.
Dual-comb Photoacoustic detection of Ammonia using a resonant acoustic gas cell
Authors: Ruiz-Llata Marta , Sanoyan Yuliy M. , Bonilla-Manrique Oscar E. , Acedo Pablo , Martín-Mateos Pedro
Published: September 2022

We present the design and characterization of a dual-frequency comb photo-acoustic spectroscopy set-up for ammonia detection in the near infrared. The system consists of an electro-optic dual comb generator and a cylinder resonator gas cell.
Ultra-compact QEPAS sensors for simultaneous detection of toxic gases in atmosphere based on custom near-IR DFB laser-diodes
Authors: Kniazeva E.I. , Russo S. Dello , Díaz-Thomas D. A. , Ayache D. , Boissier G. , Bahriz M. , Spagnolo V. , Vicet A.
Published: September 2022

This work deals with the creation of light ultra-compact QEPAS sensors for detection of toxic gases in atmosphere, implementing innovative custom near-IR Distributed Feedback laser diodes (DFBs) emitting at 2.3 µm.
A High Spatial Resolution Distributed Acoustic Sensor based on Ultra Low-loss Enhanced Backscattering Fiber
Authors: Masoudi Ali , Snook James H. , Lee Timothy , Beresna Martynas , Brambilla Gilberto
Published: September 2022

In this study, a high spatial resolution distributed acoustic sensor (DAS) with 8 cm gauge length based on ultra low-loss enhanced backscattering (ULEB) fiber with 1 km sensing range is demonstrated.
Distributed Strain Sensing with Simple System Based on Slope-Assisted BOTDA Using Both Gain and Loss Spectra
Authors: Nonogaki Hayato , Saito Daiki , Hoshino Kazuki , Tanaka Yosuke , Dzulkefly Zan Mohd Saiful
Published: September 2022

We demonstrate real time distributed strain sensing by slope-assisted Brillouin optical time domain analysis using both loss and gain spectra, where the system is simplified by using deep intensity modulation and serrodyne phase modulation.
Polycyclic Aromatic Hidrocarbons Identification with THz Metageometries
Authors: Jáuregui-López Irati , Insausti Kizkitza , Beriain María-José , Beruete Miguel
Published: September 2022

In this work, a labyrinth metageometry is experimentally tested as Polycyclic Aromatic Hydrocarbons THz detection and identification, with a design able to detect different concentrations and distinguish between different compounds at the same concentration.
Two-Photon Rotational Spectroscopy of Cold Trapped HD+ Ions for Improved Characterization of THz Electric Fields
Authors: Constantin Florin Lucian
Published: September 2022

Comparison of two-photon rotational spectroscopy measurements of cold trapped HD+ ions with ab-initio quantum theory predictions may improve significantly the characterization of the amplitudes and phases of the Cartesian components of a THz electric field. (tel: +33 (0)3.20.43.47.90)
Polarization-resolved Terahertz Time-domain Spectroscopy Enabled by Nanowire Sensor Technology
Authors: Peng K. , Jevtics D. , Zhang F. , Sterzl S. , Damry D. A. , Rothmann M. U. , Guilhabert B. , Strain M. J. , Tan H. H. , Herz L. M. , Fu L. , Dawson M. D. , Hurtado A. , Jagadish C. , Johnston M. B.
Published: September 2022

A novel nanowire sensor is developed for full characterization of polarization states of radiation in terahertz time-domain spectroscopy, offering a fast, accurate and convenient platform to allow studying the anisotropic complex dielectric properties of materials.
Photonic Integrated Circuit (PIC) Platform for Sensing Biomarkers
Authors: Morales Jennifer M. , Bickford Justin R. , Cho Pak , Pellegrino Paul M.
Published: September 2022

Our Photonic Integrated Circuit (PIC) wearable biosensor platform is small (mm), easily mass-manufactured and has high sensitivity. Here we show a PIC platform for sensing biomarkers using streptavidin as a proof-of-concept.
Experimental and numerical optimization of optical wearable devices to measure tissue oxygenation
Authors: Cascales Juan Pedro , Roussakis Emmanuel , Li Xiaolei , Greenfield Daniel A. , Goss Avery , Witthauer Lilian , Keshishian Helen , Nguyen John Q. , Marks Haley L , Draghici Adina E. , Hamner Jason W. , Taylor J. Andrew , Evans Conor L
Published: September 2022

We have developed an experimental and algorithmic toolset to obtain reliable transcutaneous oxygenation readings using a lightweight wearable sensor. We present successful clinical results of tissue oxygenation during local and systemic changes in blood flow.
Group Index Biosensor through Ring-down Interferograms
Authors: Lai Hsuan , Kuo Tzu-Ning , Xu Jia-Yi , Hsu Shih-Hsiang
Published: September 2022

We propose dual microring-resonators coupled with a Mach-Zehnder interferometer for biosensing. With its simple design and low cost, the detection limit is enhanced as an 8.3×10-7 refractive-index unit through ring-down interferograms in the spatial domain.
Sensing of Biomagnetic Activity from Mammalian Tissues Using a Diamond Quantum Sensor
Authors: Troise Luca , Webb James , Hansen Nikolaj Winther , Olsson Christoffer , Pfau Teresa Klara , Tomasevic Leo , Brinza Ovidiu , Achard Jocelyn , Staacke Robert , Kieschnick Michael , Meijer Jan , Thielscher Axel , Siebner Hartwig Roman , Perrier Jean-Francois , Berg-Sørensen Kirstine , Huck Alexander , Andersen Ulrik Lund
Published: September 2022

We report the first magnetic measurements of electrical activity from in vitro mammalian muscle and brain tissue. By using Nitrogen-Vacancy centers in diamond, these measurements can be carried out non-invasively and in an unshielded laboratory.
Nanopillar structures for enhanced dipole emission
Authors: Li Shuo , Sato Shin-ichiro , Simpson David A. , Ohshima Takeshi , Greentree Andrew D. , Gibson Brant C.
Published: September 2022

Nanoscale pillars are important for tailoring optical emission from nanoscale emitters. Here we consider nano pillar geometries designed to enhance photon extraction efficiency from quantum photons sources such as lanthanoid-doped gallium nitride and nitrogen-vacancy centres in diamond.
Thin-film Wafer-Scale Mid-IR Fabry Perot Cavity Gas Sensor
Authors: Rao Pavithra , Keloth Akshay , Selvaraja Shankar Kumar
Published: September 2022

We demonstrate a miniaturized wafer-scale optical gas sensor that combines the gas cell, an optical filter, and integrated flow channels. Using the module, we demonstrate absorption sensing of ethylene down to 100 ppm-level.
Detection of Gaseous Nerve Agent Simulants with Photoacoustic Fourier Transform Spectroscopy
Authors: Mikkonen Tommi , Luoma Daniel , Hakulinen Hanna , Vanninen Paula , Toivonen Juha
Published: September 2022

We demonstrate Fourier transform spectroscopy with a supercontinuum light source and cantilever-enhanced photoacoustic detection for sensitive (sub-ppm) and selective sensing of nerve agents with low gas consumption of a few milliliters.
Low-loss Germanium-on-insulator passive waveguides for mid-infrared photonics platform
Authors: Lim Jinha , Shim Joonsup , Kim Seong Kwang , Lim Hyeongrak , Lee Seung Woo , Geum Dae-Myeong , Kim SangHyeon
Published: September 2022

We demonstrated the low-loss channel and slot waveguides using Germanium-on-insulator for the mid-infrared range. In N2 purge state for measuring propagation loss, 1.40 and 1.98 dB/cm of the channel and slot waveguide, respectively, were obtained.
Self-Assembled Plasmonic Array Sensors for Cannabinoids
Authors: Tay Li-Lin , Hulse John
Published: September 2022

Multilayered vertically aligned gold nanorod (AuNR) arrays are synthesized through a self-assembly process. Coupling of the localized surface plasmon resonances of AuNRs upon resonant excitation enables highly localized electromagnetic fields along the long axis of the AuNR when illuminated. Vertical alignment allows for the formation of larger “hot volumes” where many more analyte molecules can benefit from the field enhancement as compared to conventional SERS sensors. In this paper, we will demonstrate the use of plasmonic array sensors for the detection of cannabinoids.
Photothermal signal readout from lateral flow assay by microfiber long-period grating
Authors: Huang Tiansheng , Sun Li-Peng , Guan Bai-Ou
Published: September 2022

This paper shows a platform for reading out results of immunologic recognition by spectral integration of microfiber long-period grating and photothermal generation from immunoassay-associated plasmonic resonance. Experimental verification of chromium ion detection is also presented.