Results 111 to 120 of about 34,940 (240)

HoloSpec: Dispersion‐Based 4D Computational Holographic Hyperspectral Imaging

Laser &Photonics Reviews, EarlyView.
HoloSpec, a compact dispersion‐based computational holographic system, achieves four‐dimensional imaging by retrieving 3D spatial structure and high‐resolution spectra from only two monochromatic snapshots. Using a single prism and a monochrome sensor, it resolves 430 spectral channels with 3 nm experimental resolution and 30 μm$\mathrm{\mu}\mathrm{m}$
Jingyan Chen, Yuxing Li, Yanmin Zhu, Edmund Y. Lam   +3 more
wiley   +1 more source

Resolution improvement methods applied to digital holography [PDF]

This thesis discusses the creation, acquisition and processing of digital holograms. Several techniques to improve the optical resolution have been investigated and developed.
Claus, Daniel
core  

Recent progress of atomic resolution holography: from point defects to defect complexes

Applied Physics Express
Atomic-resolution holography, which uses X-rays or neutrons with wavelengths of about 1 Å, is a technique for visualizing three-dimensional local structures around specific elements, and its variations were demonstrated between 1990 and 2001 ...
Kouichi Hayashi, Kenji Ohoyama, Tomohiro Matsushita   +2 more
doaj   +1 more source

Optimal Universal Bounds for Waves With Varied Coherence Based on Supremum and Infimum Coherence Spectra

Laser &Photonics Reviews, EarlyView.
Coherence variation is ubiquitous in nature, yet determining how it constrains physical observables remains challenging for multimode waves. To address this challenge, this work establishes a majorization‐based theory that identifies the supremum and infimum in the set of input coherence spectra, which provide optimal universal bounds for any linear ...
Shiyu Li, Cheng Guo
wiley   +1 more source

Generating Helical Polymorphic Beams Using Dielectric Metasurfaces

Laser &Photonics Reviews, EarlyView.
Helix‐shaped polymorphic beams are optical fields whose intensity maxima spiral around the propagation axis, enabling particle manipulation through attractive or repulsive forces. Traditionally requiring expensive spatial light modulators, metasurfaces now provide a compact, cost‐effective alternative. This work demonstrates general helical polymorphic
Maryam Setareh, Yang Xu, Jose A. Rodrigo, Kenneth B. Crozier   +3 more
wiley   +1 more source

Reconfigurable Geometric Phase Matching by Multilayered Nonlinear Thin‐Film Crystals

Laser &Photonics Reviews, EarlyView.
The concept of geometric phase matching is demonstrated as a dynamically reconfigurable approach for tunable nonlinear wave mixing in multilayered nonlinear thin‐film crystals. Experimental results reveal full modulation in a bilayer structure and near‐perfect spin‐selective phase matching of second‐harmonic generation in an eight‐layer configuration ...
Danielle Ben‐Haim, Mai Tal, Xiaoxi Xu, Tal Ellenbogen   +3 more
wiley   +1 more source

High-efficiency, broadband, and low-crosstalk 3D holography by multi-layer holographic-lens integrated metasurface

APL Photonics
Holographic display is considered the holy grail of photorealistic three-dimensional (3D) visualization technology because it can provide arbitrary wavefronts related to the essential visual cues of 3D images.
Shuo Sun, Jin Li, Xiaoxun Li, Xiangyu Huang, Yi Zhang, Liang Chen   +5 more
doaj   +1 more source

Development of a Holographic Directional Volumetric Display

IEEE Access
In previous studies, we introduced a directional volumetric display which can project in multiple directions by superimposing different two-dimensional images in three-dimensional space.
Renta Noguchi, Tomoya Isayama, Takashi Nishitsuji, Hirotaka Nakayama, Tomoyoshi Shimobaba, Tomoyoshi Ito, Atsushi Shiraki   +6 more
doaj   +1 more source

Compact Single‐Shot Incoherent Edge Detection With a Polarization‐Multiplexed Metalens

Laser &Photonics Reviews, EarlyView.
A polarization‐sensitive metalens enables single‐shot incoherent edge detection by generating two polarization‐dependent images and digitally subtracting them to realize a high‐pass optical transfer function. ABSTRACT Edge detection under incoherent illumination is highly desirable for compact vision systems but remains challenging due to the lack of ...
Weiyan Li, Xiaotong Li, Youngsun Jeon, Hyeonsu Heo, Jaekyung Kim, Gyeongtae Kim, Shiqi Hu, Minsu Jeong, Cherry Park, Seokho Lee, Le Dai, Mu Qiao, Qi Zheng, Zheng Zhu, Zhaogang Dong, Chunying Guan, Jinhui Shi, Junsuk Rho   +17 more
wiley   +1 more source

Double resolution microwave holography [PDF]

, 1976
Includes bibliographical references.This thesis endeavours to record the development and subsequent evaluation of a simple technique for the recording of microwave holograms using common hardware components, which offers the possibility of significant ...
Nilsen, Christopher Shakespeare
core   +1 more source