Results 101 to 110 of about 1,184,514 (267)

Imaging properties of computer-generated holograms: the phase distribution effect in the objects’ space

St. Petersburg Polytechnical University Journal: Physics and Mathematics, 2020
In the paper, the influence of phase distribution over the objects’ space on resolution and depth of field of computer-generated holograms has been investigated.
Koreshev Sergey, Smorodinov Denis, Marina Frolova, Starovoitov Sergei   +3 more
doaj   +1 more source

Transforming Brain Health With Neurotechnology Convergence (Part II): Intelligent Neurointervention Systems for Neurological Disorders

Brain Health, EarlyView.
ABSTRACT Neurological disorders represent a critical domain within global health, necessitating advanced interventions to address complex pathologies such as tumors, functional disorders, and cerebrovascular diseases. Despite the proven benefits of early intervention, current treatment paradigms face significant challenges: (1) limited precision in ...
Qing Ye, Fei Peng, Chao Pan, Ping Zhang, Xuewei Xie, Zixiao Li, Yingxin Tang, Danyang Chen, Yuanwei Li, Jiawen Wu, Zao Han, Qing Dai, Quansheng Gu, Jizong Zhao, Zhouping Tang   +14 more
wiley   +1 more source

Information content as a parameter of acoustical hologram reconstructibillty

Archives of Acoustics, 2016
The aim of this paper is to discuss the information content of an acoustical hologram and to determine its dependence on the determining parameters.
Jan KALUŽNÝ, Jerzy K. ZIELENIUK
doaj  

Review of millimeter‐wave and terahertz near‐field synthetic aperture radar imaging technology

InfoScience, EarlyView.
Abstract This paper comprehensively reviews the development of millimeter‐wave (MMW) and terahertz (THz) near‐field imaging technologies, with an emphasis on the state of synthetic aperture radar (SAR)‐based imaging technologies. Near‐field imaging technologies are categorized into passive and active imaging modes, among which active imaging is favored
Qi Yang, Hongqiang Wang, Xu Chen, Xin Peng   +3 more
wiley   +1 more source

Metasurface orbital angular momentum holography

Nature Communications, 2019
Conventional hologram designs lack orbital angular momentum selectivity. Here, the authors design metasurface holograms consisting of GaN nanopillars with discrete spatial frequency distributions allowing the reconstruction of distinctive orbital angular
Haoran Ren, Gauthier Briere, Xinyuan Fang, Peinan Ni, Rajath Sawant, Sébastien Héron, Sébastien Chenot, Stéphane Vézian, Benjamin Damilano, Virginie Brändli, Stefan A. Maier, Patrice Genevet   +11 more
doaj   +1 more source

Combining the Underwater Vision Profiler 6 with sediment traps to measure in situ velocity of marine particles

Limnology and Oceanography: Methods, EarlyView.
Abstract Particles sinking from the surface to the deep ocean play a key role in the biological carbon pump, whose efficiency depends partly on sinking velocities. Over the last decade, in situ imaging has enabled critical advances in our understanding of particle dynamics in the ocean.
Manon Laget, Alexandre Accardo, Marc Picheral, Camille Catalano, Lionel Guidi, Tristan Biard   +5 more
wiley   +1 more source

Method for Assessing the Fidelity of Optical Diffraction Tomography Reconstruction Methods

, 2019
We use a spatial light modulator in a diffraction tomographic system to assess the accuracy of different refractive index reconstruction algorithms. Optical phase conjugation principles through complex media, allows us to quantify the error for different
Ayoub, Ahmed B., Lim, Joowon, Pham, Thanh-An, Psaltis, Demetri, Unser, Michael   +4 more
core   +1 more source

Recent Advances in Photonic Bound States in the Continuum: From Fundamentals to Engineering and Implementation

Laser &Photonics Reviews, EarlyView.
This review summarizes recent progress in meta‐photonics with a focus on bound states in the continuum (BICs) as a powerful platform for light confinement and control. It covers fundamental concepts, design strategies across optical regimes, symmetry breaking for practical quasi‐BICs, tunable and AI‐assisted BIC devices, and emerging applications in ...
Hafiz Saad Khaliq, Hak‐Rin Kim
wiley   +1 more source

Coherence‐Gated Mirau Interferometry for Single‐Shot Quantitative Phase Imaging and Motion Sensing

Laser &Photonics Reviews, EarlyView.
This paper presents a compact add‐on module converting a Mirau or other on‐axis interferometer into a single‐shot quantitative phase imaging system using coherence gating and precise optical path matching. Demonstrations include time‐resolved imaging of human cells and streaming red blood cells, visualization of evaporation dynamics in liquid mixtures,
Petr Bouchal, Martin Konečný, Zdeněk Nováček, Radim Chmelík, Zdeněk Bouchal   +4 more
wiley   +1 more source

Sparsity-Guided Phase Retrieval to Handle Concave- and Convex-Shaped Specimens in Inline Holography, Taking the Complexity Parameter into Account

Optics
In this work, we explore an optimization idea for the complexity guidance of a phase retrieval solution for a single acquired hologram. This method associates free-space backpropagation with the fast iterative shrinkage-thresholding algorithm (FISTA ...
Yao Koffi, Jocelyne M. Bosson, Marius Ipo Gnetto, Jeremie T. Zoueu   +3 more
doaj   +1 more source