bluuebunny/crossref_metadata_2025 huggingface dataset:
Generation of 3D Light Field with Reconfigurable Time-Dimension Characteristics based on Integral Imaging
Authors: Gao Yanze , Li Zhuo
Published: November 2021

It is hard to generate a large-array 3D light field with reconfigurable time-dimension characteristics. An integral imaging system that can superimpose equal-time-delay images was developed to generate a 3D light field containing 64×64 optical delay signals. This work is important for the hardware-in-the-loop simulation of autonomous vehicles.
Compact interferometric projector for high accuracy 3D imaging in space
Authors: Thorstensen Jostein , Thielemann Jens , Risholm Petter , Gjessing Jo
Published: November 2021

We describe a novel projector design based on interferometric fringe projection. The key component in the projector, a movable micro-mirror, has undergone initial vibration, TVAC and radiation testing, with no observed component degradation. We use multi-frame active stereo as basis for 3D reconstruction, giving 3D measurement standard deviation of 0.2 mm, with 12.5 Hz 3D image capture rate and 3D image resolution of 500 x 500 pixels. The system's low power, small size and component longevity makes it well suitable for space applications.
Tunable multi-focal Diffractive lens
Authors: Ghebjagh Shima Gharbi , Behrens Arne , Feßer Patrick , Sinzinger Stefan
Published: November 2021

A specific combination of diffractive optical elements can form a tunable multi-focal diffractive lens generating an array of adjustable coaxial focal spots with uniform intensity distribution. The mutual rotation of the two cascaded diffractive grids provides a continuous adjustment of the optical power based on the Alvarez-Lohmann approach and a dynamic tuning of the foci distances.
3D Moving Particles Detection By Space-to-Time Encoding
Authors: Lev Ofer Bar , August Isaac , Stern Adrian
Published: November 2021

A novel method for measuring the location and speed of extremely fast moving particles is presented. The method is based on time-space transform and compressive sensing with a single photon counting detector.
OCT Based Scanning System to enable 3D Viewing, Sharing and Printing of Artworks
Authors: Zhou Xingyu , In Darlene , Xiong Xinchang , Yang Kunze , Chen Xing , McCune Bruhn Heather , Liu Xuan , Yang Yi
Published: November 2021

We acquired 3D volumetric data of artworks with an OCT-based hybrid scanning platform. The data is then exported into standard 3D data formats that can be 3D printed, shared, and viewed in VR and AR.
Optical Performance Analysis of 3D Light Field Display Using Lens Design Software
Authors: Zhuang Zhenfeng , Wong Herman M. K. , Rabia Sédick , Dallaire Xavier , Parent Jocelyn , Thibault Simon
Published: November 2021

We investigated the optical performance of a specific 3D light field display implementation using Zemax software in terms of wavefront error and imaging parameters including spot size, lateral color, Strehl ratio, and point spread function.
Automatic registration of gesture-sensor data and light-field for aerial 3D-touch interface
Authors: Sánchez Salazar Chavarría Iván A. , Nakamura Tomoya , Yamaguchi Masahiro
Published: November 2021

We propose an automatic registration method for the data obtained by a commercial 3D-tracking sensor and the 3D image reproduced by a light-field display for an aerial 3D-touch interface.
A TV regularisation sparse model for light field reconstruction
Authors: Gao Shan , Liu Yuhan , Qu Gangrong
Published: November 2021

We present an alternating direction method of multipliers algorithm(ADMM) based on total variation(TV) regularisation for the light field reconstruction from the focal stack data. Experiments show the proposed method is effective using refocusing measure.
Overview on convolutional neural network-based classification of red blood cells in lensless single random phase encoding
Authors: O’Connor Timothy , Hawxhurst Christopher , Shor Leslie M. , Javidi Bahram
Published: November 2021

We overview a previously reported system for red blood cell identification using convolutional neural networks in lensless single random phase encoding. The methods presented provide improved classification performance and increased robustness to various noise models.
Development of Photoacoustic Screening Device for Potential Oral Cancer Application
Authors: Khan Suhel , Vasudevan Srivathsan
Published: November 2021

This paper proposes the development of a label-free photoacoustic screening device to be used as an oral cancer application. Acoustic spectral response of the tissue sample would be acquired through the developed photoacoustic system and the signals would be used as a signature to determine the pathology of the tissues. The development would also make this setup portable so that it can be taken up for the oral screening.
Temperature calculation from estimated spectra, using the two-color pyrometry
Authors: Castillo Fernando , Garcés Hugo O. , Arias Luis , Rojas Alejandro
Published: November 2021

A method is proposed to validate the flame temperature calculated with the two-color pyrometer method. The temperature is obtained from the estimated spectra, us- ing the Maloney & Wandell method, and compared with measurements from a type K thermocouple.
Spectroscopic detection of microplastics
Authors: Koch Martin
Published: November 2021

We discuss advantages and drawbacks of different methods to spectroscopically distinguish microplastics particles and natural materials typically found in the marine environment.
IR Spectroscopy of Aqueous Ethanol Solutions: Dispersive versus Single-chip FT-IR
Authors: Lee Tse-Ang , Chowdhury Aminur Rashid , Hutter Tanya
Published: November 2021

Near-infrared spectra of aqueous ethanol solutions of different concentrations and optical pathlengths were tested and compared two different types of infrared spectrometers. Optimal operating conditions and performance are reported.
CNN-based Real-time Image Restoration in Laser Suppression Imaging
Authors: Peng Xiaopeng , Srivastava Prateek R. , Swartzlander Grover A.
Published: November 2021

We introduce the use of an Iterative Fully Convolutional Network (IFCN) for the restoration of laser suppressed images. A Compute Unified Device Architecture (CUDA) enabled implementation for real-time image recovery is also presented.
Temporal Multiplexing Method with Off-axis Digital Holography using Acousto-optic Modulators
Authors: Anzai Wataru , Kakue Takashi , Shimobaba Tomoyoshi , Ito Tomoyoshi
Published: November 2021

We propose a temporal multiplexing method of two holograms based on off-axis digital holography using acousto-optic modulators. The proposed method can overcome the limitation of the frame rate of an image sensor for digital holography.
Comparative characterization of dithering schemes for denoising and performance improvement in spectral imaging interferometry
Authors: Taudt Christopher , Hartmann Peter
Published: November 2021

Noise is a main error source in low-coherence spectral imaging interferometry. Within this work, different dithering schemes are characterized for noise reduction. Additionally, the effect on interferometric profilometry is shown.
Portable Fourier ptychography microscope (FPM) for biological samples with deep learning image reconstruction capability
Authors: Nehmetallah George , Nguyen Thanh , Phan Thuc , Aslam Shahid
Published: November 2021

A portable FPM to perform wide field-of-view, high spatial-resolution imaging for biological samples is developed. An NVIDIA Jetson-Nano board is used to computationally construct the images. The FPM has the potential to be compatible to space-based payloads.
Audio encryption by using hybrid method
Authors: Hazer Abdurrahman , Yıldırım Remzi
Published: November 2021

This study offers a hybrid approach for encrypting sounds. The approach consists of two stages: the conversion of sound to image and encoding the sound converted to image with the hybrid method included diffractive encoding.
Noise Effect to Data Acquisition Time in FLIM via RATS Method Using Single-Pixel Camera Configuration
Authors: Junek J. , Žídek K.
Published: November 2021

We outline the novel RATS method in the single-pixel camera configuration for fluorescence lifetime imaging. By using simulations, we focus on the effect of noise in measured excitation and photoluminescence signals concerning 2D scene reconstruction.
Fourier Transform Spectroscopy Using Difference Frequency Generation Comb Sources at 3.3 µm and 7.8 µm
Authors: Hjältén Adrian , Germann Matthias , Sadiek Ibrahim , Lu Chuang , Vieira Francisco Senna , Krzempek Karol , Hudzikowski Arkadiusz , Głuszek Aleksander , Tomaszewska Dorota , Stuhr Michael , Soboń Grzegorz , Foltynowicz Aleksandra
Published: November 2021

We use offset-frequency-free difference frequency generation comb sources and a Fourier transform spectrometer with comb-mode-width limited resolution to measure and analyze spectra of molecular species of atmospheric relevance: CH3I and CH2Br2 around 3000 cm-1, and 14N 162O around 1280 cm-1.
Layer-oriented CGH with attenuated speckle noise in focused-layers and reduced defocus noise
Authors: Cruz Maria-Luisa
Published: November 2021

In the layer-oriented computer-generated hologram, the diffraction of de- focused layers could introduce noise in other regions. We present a method for reducing the diffraction effects of de-focused layers and at the same time the method reduces the speckle noise in the focused layers
Scattering loss analysis in PMMA WGM micro resonator from surface irregularities
Authors: Berķis Robert , Draguns Kristians , Alnis Janis , Brice Inga , Atvars Aigars
Published: November 2021

The following work shows new ways to analyze PMMA WGM micro resonators, that have irregularities, which acts as scattering centers. The scattering analyses could be used for integration into sensor systems and corrections of existing experiments.
Optics-Free Imaging Using A Self-Consistent Supervised Deep Neural Network
Authors: Nelson Soren , Menon Rajesh
Published: November 2021

We propose a deep neural network self-consistent supervised model for optics-free image reconstruction. The model learns both the inverse imaging problem as well as the forward to better constrain the reconstruction.
Observing the Morphological Changes of Irradiated Bladder Carcinoma Cells Using Digital Holographic Microscopy
Authors: Liu Yakun , Che Leiping , Zhao Hui , Li Yijing , Xiao Wen , Pan Feng
Published: November 2021

We observed the morphology of bladder carcinoma cells before and after radiation respectively using digital holographic microscopy. The morphological change of irradiated cells is recorded.
Quantifying Information via Structural Complexity in Optical Beams Using Shannon Entropy
Authors: Ye Jiachi , Solyanik-Gorgone Maria , Afanasev Andrei , Sorger Volker J.
Published: November 2021

We propose a new definition of classical Shannon information that is detached from a particular alphabet and scales with the complexity of the optical field. We experimentally validate these results by reconstructing the wavefront topology.
Compressive spectral virtual multishot imager via lenslet array
Authors: Marquez Miguel , Monsalve Jonathan , Rueda Hoover , Arguello Henry
Published: November 2021

This work proposes a lenslet-array color-coded aperture-based compressive spectral device that acquires a single 2D compressed snapshot that can be rearranged into multiple virtual snapshots.
Modeling of Nanostructured Thin Films for Optical Readout
Authors: Cesnik Stefan , Coclite Anna Maria , Bergmann Alexander
Published: November 2021

We present an optical FEM simulation model for a nanostructured hydro- gel thin film system. These materials may be use as fast optical sensors in environmental monitoring. The imprinted hydrogel structure acts as a diffraction grating.
Comb-locked frequency-swept synthesizer for ultra-precision long distance ranging
Authors: Mayzlin Yuriy , Puppe Thomas , Wilk Rafal , Leisching Patrick , Kaenders Wilhelm G.
Published: November 2021

Optical Frequency Domain Reflectometry features high resolution and sensitivity. The resolution is limited by the laser scan range, linearity and noise. We introduce a laser source capable of precise > 10 THz wide and > 1 THz/s fast scans remaining phase locked to the optical comb. A resolution of 0.5E-6 at 20 km fiber is demonstrated.
Quantitative Large-Area Agglutination Assay Sensing of Protein Molecules in Solution
Authors: Potter Colin J. , Xiong Zhen , McLeod Euan
Published: November 2021

A portable quantitative large-area binding sensor based on lensfree holographic microscopy, microfluidics, a custom LED array, and computational image processing and feature quantification algorithm has been implemented to sense proteins in solution through microbead agglutination.
Wide-Field and Micron-Resolution Visible Light Optical Coherence Tomography in Human Retina by a Linear-K Spectrometer
Authors: Song Weiye , Shao Wenjun , Yi Ji
Published: November 2021

Here we presented the first linear-in-k visible range OCT spectrometer and achieved a sub-5dB roll-off over the entire imaging depth. Full range depth-of-view and wide-field human retinal vis-OCT imaging were demonstrated.
A 41G subretinal injection cannula integrating a guiding OCT probe
Authors: Abid Alexandre , Duval Renaud , Rezende Flavio , Boutopoulos Christos
Published: November 2021

We present a 41G subretinal injection cannula integrating a guiding OCT probe. The guiding system includes a micromanipulator and a user-friendly interface. Ex-vivo validation indicated successful guidance of injections in porcine eyes.
Intraluminal fluorescence lifetime imaging (FLIm) as a diagnostic tool for gastrointestinal disease
Authors: Alfonso-Garcia Alba , Cevallos Stephanie , Lee Jee-Yon , Li Cai , Bec Julien , Baumler Andreas , Marcu Laura
Published: November 2021

Metabolic changes associated with gut inflammation presents an opportunity for early gastrointestinal (GI) disease detection using fluorescence lifetime imaging (FLIm). We present a compact, intraluminal FLIm instrument as an imaging diagnostic tool for GI disease.
Super-Resolution Fiber-Bundle Light Field Endoscopy
Authors: Du Xiaoxi , Zhu Shuaishuai , Gao Liang
Published: November 2021

We built a fiber-bundle light-field imaging system for endoscopic depth imaging. The intrinsically low resolution of the fiber-based light field imaging was greatly improved by training a deep neural network using high-resolution light field images.
De-scattering with Excitation Patterning (DEEP) in temporal focusing microscopy
Authors: Zheng Cheng , Park Jong Kang , Yildirim Murat , Boivin Josiah R. , Xue Yi , Sur Mriganka , So Peter T. C. , Wadduwage Dushan N.
Published: November 2021

The scattering in turbid samples severely degrades image quality of temporal focusing microscopy. To address this challenge, we introduce a novel technique called Descattering with Excitation Patterning, which uses patterned excitation followed by wide-field detection.
Diffuser-based computational funduscopy
Authors: Li Yunzhe , McKay Gregory N. , Durr Nicholas J. , Tian Lei
Published: November 2021

We demonstrate a low-cost diffuser-based computational funduscope that can recover pathological features of the model eye fundus. Our device achieves over 33° FOV and is robust to 4D refractive error using a single-shot point-spread-function.
Numerical analysis of DarkFocus metric for autofocusing in lensless digital in-line holographic microscopy
Authors: Trusiak Maciej , Rogalski Mikołaj , Winnik Julianna
Published: November 2021

Autofocusing is a vital step of in-line digital holographic microscopy enabling large-volume label-free quantitative imaging. We numerically evaluate the axial resolution of novel dark-field based metric in comparison with Tamura-of-Gradient method.
The Effect of Scattering on Spatial Resolution of Raman Spectroscopy in Tissue
Authors: Hales Jordyn , Jones Jessica , Shipp Dustin
Published: November 2021

We present a study to determine the minimum spatial sampling resolution required to detect cancer cells. We compare results from Monte Carlo simulations and experiments using beads embedded in tissue phantoms with varying scattering properties.
Interfacing with small brain volumes with tapered fiber-based optrode
Authors: Spagnolo B. , Peixoto Rui T. , Sileo L. , Pisanello M. , Pisano F. , Assad J.A. , Sabatini B. L. , DeVittorio M. , Pisanello F.
Published: November 2021

Optogenetics offers the possibility of understanding behavior-related neuronal circuits, using light to trigger neuronal response. The exploitation of unconventional microfabrication techniques has led to the development of different optoelectronic devices to deliver light while electrically recording neural activity over small volumes even in deep brain areas.
Subtraction Imaging Based on Confocal Microscopy with Array Detection
Authors: Wang Famin , Chang Jian , Zhang Yunhai , miao Xin , Li Hangfeng
Published: November 2021

A method based on image subtraction is provided to improve the three-dimensional resolution and SNR in confocal microscopy with array detection. By applying the method we can enhance lateral resolution ~0.256λ and axial resolution ~0.723λ.
Dual-channel Diffuse Correlation Spectroscopy for Simultaneous Blood Flow Measurement of Multiple Muscles
Authors: Tsuchiya Tomohiro , Yamamoto Yukihiko , Nakabayashi Mikie , Ichinose Masashi , Ono Yumie
Published: November 2021

We developed a dual-channel diffuse correlation spectroscopy system, which was validated by simultaneous blood flow measurement of the skeletal muscles of the upper and lower limbs during the head-up-tilt test.
Evaluation of Muscle Blood Flow Improvement in Manipulative Therapy by Diffuse Correlation Spectroscopy
Authors: Matsuda Yasuhiro , Nakabayashi Mikie , Ono Yumie
Published: November 2021

Using diffuse correlation spectroscopy we quantitatively verified that the manipulative therapy could significantly increase local muscle blood flow.
Reliability of automated optical determination of capillary refill time
Authors: Marcinkevics Zbignevs , Laksa Edgars , Rubenis Oskars , Blumfelde Mara
Published: November 2021

The present study is devoted to assessment of automated optical capillary refill time determination by custom developed optoelectronic device prototype. Study comprised fifteen healthy volunteers; To induce capillary refill time changes the hand position challenge was utilized. During rest conditions slight inter-subject variation was observed: T90 (0.75±0.27 s), TSTB (2.20±0.58 s) and temperature at the measurement site (32.21±1.87 Co), however during hand position challenge results were more consistent. Rising hand substantially increased, while lowering slightly decreased capillary refill time. We conclude that automated determination of refill time have high clinical potential, however more extensive studies are required to determine reliable methodology and provide measurement guidelines.
Human Cervix Imaging and Analysis with Optical Coherence Tomography
Authors: McLean James P. , Fang Shuyang , Myers Kristin M. , Hendon Christine P.
Published: November 2021

Human cervix specimens from pregnant and non-pregnant donors were analyzed with Optical Coherence Tomography. Mosaic OCT volumes and optical coefficient maps revealed a complex tissue architecture with cysts and abnormalities embedded in the extracellular matrix.
Second-Harmonic Generation Microscopy with Texture Analysis for Colon Cancer Diagnostics
Authors: Mažeika Viktoras , Mačiulis Mykolas , Kontenis Lukas , Žurauskas Edvardas , Barzda Virginijus
Published: November 2021

Second-harmonic generation microscopy was used to image collagen in normal and cancerous human colon histological samples, and texture analysis was used to investigate the changes in collagen structure occurring during carcinogenesis.
Label-free SERS detection of proteins based on machine learning classification of chemostructural determinants
Authors: Farnesi Edoardo , Barucci Andrea , D’Andrea Cristiano , Banchelli Martina , Amicucci Chiara , de Angelis Marella , Matteini Paolo
Published: November 2021

We present an effective machine learning classification plus chemostructural characterization of proteins by a mixed data processing based on Principal Component Analysis applied to multipeak fitting on Surface-enhanced Raman Scattering spectra.
Accuracy of Diffuse Correlation Spectroscopy measurements of brain blood flow when using a three-layer analytical model
Authors: Zhao Hongting , Sathialingam Eashani , Buckley Erin M.
Published: November 2021

We investigated the accuracy of estimating cerebral blood flow with diffuse correlation spectroscopy when modeling the head as a 3-layered medium with unknown optical properties and layer thickness.
High-resolution structural and functional deep brain imaging using adaptive optics three-photon microscopy
Authors: Streich Lina , Boffi Juan , Wang Ling , Alhalaseh Khaleel , Barbieri Matteo , Rehm Ronja , Deivasigamani Senthilkumar , Gross Cornelius , Agarwal Amit , Prevedel Robert
Published: November 2021

We present an intravital imaging system based on three-photon excitation, indirect adaptive optics and active electrocardiogram gating which achieves near-diffraction-limited resolution up to 1.2mm in the mouse brain. We demonstrate the capability of our technique to study spine morphology and neuroglia function non-invasively throughout an entire cortical column and in the hippocampus in the mouse brain in-vivo.
An efficient brain mapping pipeline with enhanced multi-channel image registration
Authors: Wang Xuechun , Zeng Weilin , Fei Peng
Published: November 2021

We present a multi-channel image registration algorithm, which can automatically map different types of mouse brain datasets to common coordinate framework with improved accuracy. It efficiently creates 3D brain maps with anatomical regions precisely annotated.
Label-free Map of Adult Danionella dracula Brain for in vivo Navigation Using Third Harmonic Generation Microscopy
Authors: Akbari Najva , Tatarsky Rose L. , Bass Andrew H. , Xu Chris
Published: November 2021

We use third harmonic generation to generate a high-resolution, whole-brain, label-free in vivo map of adult Danionella dracula and compare identified structures with an established brain atlas for closely-related zebrafish (Danio rerio).
VR Eye-Tracking using Deflectometry
Authors: Wang Jiazhang , Xu Bingjie , Wang Tianfu , Lee Wung Jae , Walton Marc , Matsuda Nathan , Cossairt Oliver , Willomitzer Florian
Published: November 2021

We present a novel approach for accurate eye tracking as required, e.g., in VR/AR/MR headsets. Our method exploits the retrieved surface normals and dense 3D features extracted from deflectometry measurements to estimate the gazing direction.
Modeling diffraction off Digital Micromirror Devices
Authors: Ahsanullah Danyal , Balaji Muralidhar M. , Gnade Bruce , Snider Bruce , Rangarajan Prasanna
Published: November 2021

A newer model for diffraction from a Digital Micromirror Device is disclosed. The model predicts an improvement in light throughput, when the micromirrors are addressed in a FLAT state distinct from the standard ON/OFF states.
Optical Hybrid Multiple Image Encryption
Authors: Hazer Abdurrahman , Yıldırım Remzi
Published: November 2021

A method including diffractive encoding and intermodulation has been developed to both encode multiple images and use communication bandwidth efficiently. Experimental results show that 1500 images are sent to different users as single encoded image.
How to assess depth-of-field extension strategies applied to single-molecule super-resolution microscopes?
Authors: Lévêque Olivier , Kulcsár Caroline , Lee Antony , Bon Pierre , Cognet Laurent , Goudail François
Published: November 2021

Phase masks used to extend the depth-of-field (DoF) of localization microscopes are often designed to increase localization accuracy despite a loss in detection probability. We propose a method to optimize DoF extended single-molecule localization techniques taking into account the trade-off between detection probability and localization accuracy.
Unrolling-Based Deep Reconstruction for Compressive Spectral Imaging
Authors: Bezek Can Deniz , Oktem Figen. S.
Published: November 2021

We develop a novel deep learning-based reconstruction method for compressive spectral imaging with diffractive lenses. The method incorporates U-Net based 3D deep prior to the model-based reconstruction through unrolling. Results illustrate the state-of-the-art performance of our method.
Compressive Spectral Imaging using Smoothness on Graphs
Authors: Florez-Ospina Juan F. , Lau Daniel L. , Barner Kenneth , Arce Gonzalo R.
Published: November 2021

Compressive spectral imaging reconstruction is performed using smoothness on graphs. In doing so, a highly effective and paralilizable graph-smoothness prior reconstruction algorithm is developed based on simple direct matrix inversion.
A computational hybrid proposal for imaging the stress field through a three-wavelength phase stepping
Authors: Restrepo-Martínez Alejandro , Fandiño Toro Hermes A. , Briñez-de León Juan C.
Published: November 2021

Dynamical photoelasticity studies are affected by requiring multiple acquisitions under optical elements motion. In consequence, this paper introduces a computational hybrid technique of three-wavelength phase stepping using only one-color image to recover the stress field.
Frequency-domain evaluation of light source and sensor interactions in photoelastic fringe patterns
Authors: Aristizabal-López Yeins , Restrepo-Martínez Alejandro , Fandiño-Toro Hermes
Published: November 2021

The interactions between light sources and sensors alter the spatial frequency content of fringe patterns in photoelasticity studies. This paper presents a computational strategy to evaluate these alterations in the frequency domain.
A Lensless Polarization Camera
Authors: Elmalem Shay , Giryes Raja
Published: November 2021

Polarization imaging generally requires either a designated sensor or a sequence of polarization-filtered images. We propose a lensless polarization camera, based on a conventional sensor, diffuser, simple polarization filter, and restoration algorithm.
Blind Ghost Imaging
Authors: Paniagua-Diaz Alba M. , Starshynov Ilya , Fayard Nikos , Goetschy Arthur , Pierrat Romain , Carminati Remi , Bertolotti Jacopo
Published: November 2021

Blind Ghost Imaging is an unconventional optical imaging technique that reconstructs the shape of an object without ever knowing the patterns illuminating the object, but using patterns correlated with them, no matter how weakly.
Single Pixel Imaging at MHz Rates by Cyclic Coding Masks
Authors: Hahamovich Evgeny , Monin Sagi , Hazan Yoav , Rosenthal Amir
Published: November 2021

Single pixel imaging using cyclic patterns coded onto a spinning mask achieved 2.4 MHz spatial modulation rates and real time reconstruction. The method was experimentally demonstrated by recording videos of moving objects at 72 fps.
High-Resolution Imaging using Flat Cameras
Authors: Carles Guillem , Harvey Andrew R.
Published: November 2021

Traditional high-resolution lenses have long track lengths, which prevent their integration into mobile phones. We show, using rigorous modeling, how a new computational imaging concept enables integration of fast, long-focal-length lenses within flat camera modules.
Segmentation-free, full-field Fourier ptychography
Authors: Aidukas Tomas , Loetgering Lars , Harvey Andrew R.
Published: November 2021

We present a simple computational method for full-field, segmentation-free Fourier-ptychographic reconstruction, which requires only two multiplications prior and after the reconstruction. This way, quantitative widefield reconstruction is possible even in the presence of illumination curvature.
Single-Shot Fluorescence Lifetime Imaging Microscopy Utilising a Time-Folding Optical Cavity
Authors: Carles Guillem , Kapitany Valentin , Zickus Vytautas , Faccio Daniele
Published: November 2021

We report a new technique for fluorescence lifetime imaging microscopy, using a time-folded optical cavity and a gated camera, capable of retrieving arbitrarily-high-resolution lifetime maps from single-shot acquisitions. The technique enables lifetime imaging at video-rate.
Tailoring Spatial Entropy in Extreme Ultraviolet Focused Beams for Multispectral Ptychography
Authors: Liu Xiaomeng , Loetgering Lars , de Beurs Anne , Du Mengqi , Konold Patrick , Eikema Kjeld , Witte Stefan
Published: November 2021

We demonstrate a computational approach to designing diffractive optical elements (DOEs) that can be used to focus multispectral extreme-ultraviolet radiation from a high-harmonic generation source. The polychromatic focusing properties are experimentally confirmed using ptychography.
Incoherent 3D k-space synthesis with volumetric optical coherence refraction tomography
Authors: Zhou Kevin C. , Qian Ruobing , Dhalla Al-Hafeez , Farsiu Sina , Izatt Joseph A.
Published: November 2021

We present 3D optical coherence refraction tomography (OCRT), which incoherently synthesizes an extended 3D transfer function using multi-view OCT volumes spanning two angular dimensions. Our setup features a novel use of parabolic mirrors, achieving millimetric fields of view over ±75
◦
without rotation stages.
Structured Illumination for Enhanced-Resolution Imaging of Moving Objects at Intermediate Range
Authors: Divitt Shawn , Park Samuel D. , Dave Harshil , Lin Di , Watnik Abbie T.
Published: November 2021

We integrate a projection system and camera into a structured-illumination capable telescope that generates enhanced-resolution images of moving targets at inter- mediate range using incoherent Fourier ptychography. The resolution exceeds that of the camera alone.
3D meta-optics for high-bandwidth twisted light holography
Authors: Ren Haoran , Maier Stefan A.
Published: November 2021

A complex-amplitude metasurface hologram designed in the moment space is fabricated via 3D laser nanoprinting for twisted light holography. The metasurface hologram allows for high-bandwidth orbital angular momentum multiplexing holography and a holographic video display.
Impact of Phase Flicker on the Performance of Multilevel Phase Holograms with Phase-Only LCOS Devices
Authors: Tong Yuan , Pivnenko Mike , Chu Daping
Published: November 2021

Using temporal phase flicker profiles of real phase-only LCOS devices, their effects on the performance of blazed gratings and image holograms are shown to be comparable to that introduced by phase quantization and amplitude noise.
Waveguide-type optical see-through Maxwellian near-eye display with expanded eyebox using multiplexed holographic optical element and polarization gratings
Authors: Choi Myeong-Ho , Park Jae-Hyeung
Published: November 2021

We propose a waveguide-type optical see-through Maxwellian near-eye display with two-dimensionally expanded eyebox. A multiplexed holographic optical element and polarization gratings are used as key components for expanding the horizontal and vertical eyebox, respectively.
Deep Learning-enabled Holographic Imaging Flow-Cytometry for Label-Free Detection of Giardia Lamblia in Water Samples
Authors: Göröcs Zoltán , Baum David , Song Fang , de Haan Kevin , Koydemir Hatice Ceylan , Qiu Yunzhe , Cai Zilin , Skandakumar Thamira , Peterman Spencer , Tamamitsu Miu , Ozcan Aydogan
Published: November 2021

We present a field-portable and label-free holographic imaging flow-cytometer, which quantifies the amount of Giardia lamblia cysts in water samples with a detection limit of <10 cysts per 50 mL at a throughput of 100 mL/h.
Neutron radiography through a SIFaN instrument
Authors: Wang Zhehui , He Zhong , James Michael R. , Chu Pinghan , Kiplinger Jaqueline L. , Morris Christopher L. , Nie Wanyi , Vogel Sven C. , Watkins Erik B.
Published: November 2021

Neutron radiography through Spectroscopic Imaging by Fast Neutrons (SIFaN) is described. The fast neutron tracking principle [1] has been extended to include neutron-induced fissions in actinide perovskites. The design and performance of a new SIFaN instrument, called SIFaN-perovskite (or SIFaN-P), are studied by a combination of MCNP and semi-analytical models. Hybrid organic-inorganic and actinide perovskites are considered and compared with gas and silicon for neutron detection and tracking. The Los Alamos LANSCE facility provides access to the initial SIFaN-P testing and demonstration.
Double path digital inline holography set-up to record simultaneously two different volume transversal sections.
Authors: López Ana Mª , Subías Adrián , Andrés Nieves , Lobera Julia , Roche Eva , Palero Virginia , Gómez-Climente Marina , Arroyo Mª Pilar , Pallarés Jordi
Published: November 2021

A digital inline holographic setup where two different sections of a flow are illuminated by the same beam extends the recorded volume. Each section velocity information is extracted from planes reconstructed at different axial distances.
Reduced CNNs architectures applied to phase maps corrupted with speckle noise
Authors: Tahon Marie , Montrésor Silvio , Picart Pascal
Published: November 2021

This paper addresses the problem of phase images corrupted with speckle noise. DnCNN residual networks with different depths were built and trained with various holographic noisy phase data. All models are evaluated in terms of phase error with HOLODEEP benchmark data and with 3 unseen images corresponding to different experimental conditions. The best results are obtained using a network with only 4 residual blocks, and trained with a wide range of noisy speckle patterns.
Raw holograms based machine learning for cancer cells classification in microfluidics
Authors: Priscoli Mattia Delli , Memmolo Pasquale , Ciaparrone Gioele , Bianco Vittorio , Merola Francesco , Miccio Lisa , Bardozzo Francesco , Pirone Daniele , Mugnano Martina , Cimmino Flora , Capasso Mario , Iolascon Achile , Ferraro Pietro , Tagliaferri Roberto
Published: November 2021

We investigate the ability of machine learning to provide an accurate classification of cancer cell in microfluidics when only raw digital holograms are used as input data. Comparison among different learning strategies is addressed.
Limited-view Cone Beam CT reconstruction using 3D Patch-based Supervised and Adversarial Learning
Authors: Lahiri Anish , Klasky Marc L. , Fessler Jeffrey A. , Ravishankar Saiprasad
Published: November 2021

We present a novel multi-stage algorithm for CBCT reconstruction from very limited projections. Our proposed method uses 3D patch-based supervised and adversarial learning from scarce training data, combined with physics (forward) models and statistical priors.
Noise influence on DeepDensity: convolutional neural network for local fringe density map estimation
Authors: Cywińska Maria , Brzeski Filip , Krajnik Wiktor , Patorski Krzysztof , Trusiak Maciej
Published: November 2021

Convolutional neural network based, fast and accurate local fringe density map estimation by DeepDensity significantly enhances full-field optical measurement techniques, e.g., holographic microscopy. The numerical capabilities of the proposed algorithmic solution in the case of the presence of noise were studied.
72 fps incoherent two-color digital motion-picture holography system for fluorescence cell imaging
Authors: Tahara Tatsuki , Koujin Takako , Matsuda Atsushi , Kozawa Yuichi , Ichihashi Yasuyuki , Oi Ryutaro
Published: November 2021

We present an incoherent two-color digital holography system to record holograms with 2,048 x 2,048 pixels at 72 fps for fluorescence-stained cell imaging. We utilize single-shot wavelength-multiplexed incoherent digital holography with computational coherent superposition.
Errors in Determining Coordinates in the Digital Holography of Particles
Authors: Dyomin V.V. , Davydova A. Yu. , Polovtsev I.G. , Podzyvalov S.N. , Yudin N.N. , Zinovev M.M.
Published: November 2021

Based on the approach applied to diffraction-limited optical systems, the study evaluates the measurement errors of transverse and longitudinal coordinates of particle images reconstructed from digital holograms. The paper shows the experimental results of testing the above estimates.
Fast calculation method for curved computer-generated holograms using look-up-table
Authors: Pi Dapu , Liu Juan
Published: November 2021

A method to speed up curved computer-generated holograms computation using look- up-table is proposed. Numerical results show proposed method is a valid method to calculate curved computer-generated holograms with high speed and accuracy.
Fast computation of binary amplitude holograms with optimized random phases
Authors: Velez-Zea Alejandro , Quinchia Santiago Bustamante , Barrera-Ramírez John Fredy , Torroba Roberto
Published: November 2021

We demonstrate how the use of optimized random phases enables the fast computation of binary amplitude holograms via thresholding. We obtain similar performance compared to the Gerchberg-Saxton algorithm with a significant speed advantage.
Texas Instruments Phase Light Modulator for Holography
Authors: Blanche Pierre-Alexandre , Ketchum Remington S.
Published: November 2021

The Texas Instruments Phase Light Modulator (TI PLM) is a new type of MEMS that modulates the phase of the incoming light by moving micro-mirrors up and down. We characterized this device for beam steering and for the projection of holographic images.
Cost-effective digital lensless holographic microscope
Authors: Zapata-Valencia Samuel I. , Tobon-Maya Heberley , Buitrago-Duque Carlos , Garcia-Sucerquia Jorge
Published: November 2021

This work presents the most cost-effective digital lensless holographic microscope to date. Phase resolution targets and biological samples are imaged achieving a resolution of 2.76 µm approximately at a cost of below of 55$ USD.
A Fast DST-Based Gerchberg-Saxton Algorithm for Binary-Phase Holography
Authors: Wetherfield Benjamin , Kadis Andrew , Wilkinson Timothy D.
Published: November 2021

We present a DST-based Gerchberg-Saxton search algorithm for generating binary-phase holograms. The new algorithm is shown to give an order of magnitude speed improvement for a small reduction in image quality.
Fast Mapping of Double-Pixel Holograms using K-Nearest Neighbors
Authors: Ahmadi Kavan , Maluenda David , Carnicer Artur
Published: November 2021

We introduce an algorithm able to map arbitrary complex values into an arbitrary modulation curve using the K-Nearest Neighbor algorithm. The proposed algorithm is around 80 times faster than the conventional calculation.
Toward a 3D Velocity Interferometer Testbed: Concept and Algorithm Exploration
Authors: Davies E. J. , Hutchinson T. M. , Erskine D. J. , Ali S. J. , Eggert J. H. , Smith R. F. , Celliers Peter M.
Published: November 2021

We explore a concept retrieving Doppler-shift and 3D location of coherently- illuminated moving objects in a 3D volume from recordings of the reflected light through a velocity interferometer and a multi-plane imager.
Compact ECDL design for the rapid detection of trace gases in the MIR region
Authors: Hoppe Morten , Schmidtmann Sebastian , Aßmann Christian , Honsberg Martin , Tatenguem Herve , Milde Tobias , Schanze Thomas , Sacher Joachim R. , Gu-Stoppel Shanshan , Senger Frank
Published: November 2021

An MEMS based ECDL design with optimized curved gain chip for the MIR region is presented. Results of the characterization and its use for the rapid detection of trace gases are shown.
Supercontinuum-based Fourier Transform Photoacoustic Spectroscopy for Sensitive Multi-gas Sensing
Authors: Mikkonen Tommi , Hieta Tuomas , Genty Goëry , Toivonen Juha
Published: November 2021

We investigate the noise characteristics of Fourier transform photoacoustic spectroscopy, improve the sensitivity of the technique by a factor of 20 and demonstrate our system’s ability to analyze complex gas mixtures.
DHC Sensorics of Water Turbidity and Methane in situ
Authors: Dyomin V.V. , Polovtsev I.G. , Davydova A.Yu. , Olshukov A.S.
Published: November 2021

It is shown that DHC technology allows simultaneously studying plankton and evaluating medium parameters – water turbidity and methane content by recording such marine particles as suspensions and bubbles. The results of in situ study in the Arctic are shown.
Soil sensing in precision agriculture by laser-induced breakdown spectroscopy and multivariate regression methods.
Authors: Erler Alexander , Brinkmann Pia , Beitz Toralf , Löhmannsröben Hans-Gerd
Published: November 2021

Samples of agricultural soil were analyzed by LIBS and evaluated by multivariate methods. The multivariate models provided reliable predictions of total and plant-available nutrient contents and the soil parameters humus content, pH and texture.
Fourier-Transform Infrared Spectroscopy with Near-Infrared Light
Authors: Lindner Chiara , Kunz Jachin , Herr Simon J. , Kießling Jens , Wolf Sebastian , Kühnemann Frank
Published: November 2021

Nonlinear interferometers using correlated photon pairs allow mid-infrared spectroscopy with near-infrared detection. In our work, we combine nonlinear interferom- etry with a measurement scheme and analysis in analogy to classical Fourier-transform spectroscopy, which enhances the spectroscopic performance.
Preliminary Results of Line Extraction from a Far-infrared Post-dispersed Polarizing FTS
Authors: Huber Anthony , Naylor David , Anderson Alicia , Gom Brad , Fulton Trevor , Gunuganti Sudhakar
Published: November 2021

The performance of a prototype far-infrared post-dispersed polarizing FTS has been measured using a source module consisting of unresolved emission and absorption lines and the results are compared with theoretical simulations.
A Summary of Scanning High-resolution Interferometer Sounder (S-HIS) Observations During the FIREX-AQ ER-2 Campaign
Authors: Taylor Joe K. , Tobin David C. , Revercomb Henry E. , Best Fred A. , Garcia Ray K. , Smith William , Weisz Elisabeth , Pierce R. Bradley , Kalashnikova Olga , Frost Gregory , Goldberg Mitchell
Published: November 2021

A summary of the Scanning High-resolution Interferometer Sounder (S-HIS) observations from the FIREX-AQ (Fire Influence on Regional to Global Environments and Air Quality) field campaign is presented.
On-orbit Performance of the Thermospheric Wind and Temperature Instrument on the NASA ICON Mission
Authors: Harlander John M. , Englert Christoph R. , Marr Kenneth D. , Harding Brian J.
Published: November 2021

The MIGHTI instrument was launched October 2019 on the NASA ICON Explorer mission. This presentation will discuss the performance of the MIGHTI wind sensor and techniques used for calibration and monitoring instrument drifts.
Active Fourier Transform Hyperspectral Imaging Using a High-Speed Camera
Authors: Yetzbacher Michael K. , Park Samuel D. , Sivaprakasam Vasanthi , DePrenger Michael J.
Published: November 2021

We present initial results from a prototype hyperspectral imaging and ranging system. The system utilizes a high-speed imaging detector, enabling source modulation without stabilization.
Freeform based hYperspectral imager for MOisture Sensing (FYMOS)
Authors: Graham Christopher , Girkin John M. , Bourgenot Cyril
Published: November 2021

The design and demonstration of a compact, lightweight near infrared hyper- spectral imager optimised for remote soil moisture sensing from UAV platforms using a freeform diffraction grating is presented.
Low Variance Reflectance Signatures Capture Hidden Indicators of Plant and Soil Diversity
Authors: Sousa Daniel , Mayes Marc , Davis Frank , Fisher Joshua B.
Published: November 2021

We explore the idea that key information about plant and soil diversity can largely be hidden in low-variance features, comparing to extensive ground truth, at a highly diverse and well-studied California field site.
Bragg soliton dynamics in ultra-silicon-rich nitride devices
Authors: Tan D. T. H. , Ng D. K. T. , Choi J. W. , Sahin E. , Cao Y. , Sohn B-. U. , Xing P. , Chen G. F. R. , Chia X. X. , Gao H.
Published: November 2021

We present recent progress in ultra-silicon-rich nitride nonlinear photonics. Observations of Bragg soliton dynamics unveil their ability to bring about Bragg-soliton effect compression, soliton fission and enhanced and thermally tunable spectral broadening.
Temporal dynamics of second-order correlation function in nanolasers
Authors: George Agnes , Bruhacs Andrew , Aadhi A. , Ostic Rachel , Whitby Erin , Hayenga William E. , Wang Zhiming M. , Kues Michael , Reimer Christian , Khajavikhan Mercedeh , Morandotti Roberto
Published: November 2021

We report on the temporal dynamics of second-order correlation function of high-β nanolasers excited with Gaussian-shaped pulses. We show that the nature of output radiation from the nanolaser depends on the excitaiton pulse envelope.
Integrated Avalanche Photodetectors for Visible Light
Authors: Leong Victor , Yanikgonul Salih , Ong Jun Rong , Hu Ting , Siew Shawn Yohanes , Png Ching Eng , Krivitsky Leonid
Published: November 2021

We report the first monolithically integrated avalanche photodetector for visible light. We demonstrate a high gain-bandwidth product of 234 ± 25 GHz at 20V reverse bias, and open eye diagrams at up to 56 Gbps.
Fabrication-Tolerant Four-Mode Waveguide Crossing Based on PhC-like Subwavelength Structures at 2 µm
Authors: Muratsubaki Taichi , Fujisawa Takeshi , Sawada Yusuke , Sato Takanori , Saitoh Kunimasa
Published: November 2021

A four-mode waveguide crossing based on photonic-crystal-like subwavelength structures is proposed at the 2 µm waveband, together with a novel direct binary search algorithm for obtaining fabrication-tolerant structures.
Ge2Sb2Se4Te1 Metasurface for Enhancing Third-Harmonic Generation in the Mid-Infrared
Authors: Yue Fuyong , Piccoli Riccardo , Shalaginov Mikhail Y. , Gu Tian , Richardson Kathleen A. , Morandotti Roberto , Hu Juejun , Razzari Luca
Published: November 2021

We report on the third-order susceptibilities of the phase change material Ge2Sb2Se4Te1 in the amorphous and crystalline phase states and demonstrate enhancement of third-harmonic generation in the mid-infrared using a metasurface design.
Ultra-high extinction-ratio silicon photonic polarization beam splitter with anisotropic metamaterials
Authors: Ahmed Syed Z. , Ahmed Ishtiaque , Mia Borhan , Jaidye Nafiz , Kim Sangsik
Published: November 2021

We present an ultra-high extinction-ratio silicon photonic polarization beam splitter with anisotropic metamaterial claddings. Exceptional coupling with anisotropic metamaterial achieved 58- 60 dB (46-48 dB) extinction-ratios for TE (TM) mode and the large birefringence resulted in a short coupling length (14.5 µm).
Spectral Extension of Microcombs with Two Seed Lasers
Authors: Zhang Shuangyou , Silver Jonathan M. , Bi Toby , Del’Haye Pascal
Published: November 2021

We demonstrate the spectral extension of microcombs by bichromatic pumping of a single microresonator. One of the seed lasers generates a soliton that synchronizes with the repetition rate of the second frequency comb via cross-phase modulation.
Hybrid integration of tantalum pentoxide microresonators on silicon-on-insulator
Authors: Jean Philippe , Douaud Alexandre , LaRochelle Sophie , Messaddeq Younès , Shi Wei
Published: November 2021

We report co-integration of tantalum pentoxide microresonators with silicon- on-insulator waveguides using a micro-trench filling method. The devices exhibit near critical coupling (ER > 20 dB) and low thermally induced resonance shift below 5 pm/K.
Finite line-number equi-spaced resonances based on coupled cavity resonators
Authors: Singh Manuj , Popović Miloš A.
Published: November 2021

We investigate a linear configuration of coupled cavity resonators based on tri-diagonal Kac matrix which enables such cavities to support finite equi-spaced comb of resonances. Such resonator may allow designing cavities which decouple cavity size from comb spacings.
3D-Integrated DWDM Silicon Photonics Receiver
Authors: Youn Jinsung , Huang Tsung-Ching , Rhim Peter , Hulme Jared , Chalamalasetti Sai Rahul , Mathai Sagi , Seyedi M. Ashkan , Fiorentino Marco , Beausoleil Ray
Published: November 2021

We present a 3D-integrated DWDM silicon photonics receiver having 24 independent channels. 16-Gb/s optical data transmission is successfully demonstrated with energy efficiency of 1 pJ/bit which enables aggregate bandwidth of 384 Gb/s.