Results 21 to 30 of about 10,295 (216)

Optical spin-dependent beam separation in cyclic group symmetric metasurface

Nanophotonics, 2020
Cross-polarization scattering of a circularly polarized beam from nano-rod introduces a geometric phase to the outgoing beam with opposite circular polarization.
Lee Yeon Ui, Ozerov Igor, Bedu Frédéric, Kim Ji Su, Fages Frédéric, Wu Jeong Weon   +5 more
doaj   +1 more source

Generation of High-Order Bessel Orbital Angular Momentum Vortex Beam Using a Single-Layer Reflective Metasurface

IEEE Access, 2020
In this paper, we propose a method to generate a high-order Bessel orbital angular momentum (OAM) vortex beam by using a single-layer reflective metasurface, which integrates the advantages of small size, high efficiency, insensitive polarization and ...
Haixia Liu, Hao Xue, Yongjie Liu, Qiang Feng, Long Li   +4 more
doaj   +1 more source

Airy Transform of the New Power-Exponent-Phase Vortex Beam

Photonics, 2023
A new power-exponent-phase vortex beam with nonlinear phase winding has shown flexible control freedom compared with conventional vortex beams. In order to further enrich the modulation freedom and expand the ability of self-healing to meet current ...
Qidong Lin, Hao Zhang, Zhiquan Hu, Xiaotan Lu, Xingyuan Lu, Yangjian Cai, Chengliang Zhao   +6 more
doaj   +1 more source

Research on Blind Area Suppression Technology for Vortex Beam Detection [PDF]

Hangkong bingqi
To address the problem of far-target detection blind areas caused by the dark hollow regions in the propagation direction of vortex beams， a method based on the coherent synthesis of vortex superposition using a ring-beam array is proposed.
Peng Zhiyong, Tu Yan, Zhang Ninghua, Zhou Shuping, Zhao Zidan, Xie Guanghui
doaj   +1 more source

Manipulation of Energy Flow with X-Type Vortex

Photonics, 2022
In this study, a new method for manipulating energy flow in a 3D vector field is proposed. In this method, an azimuthally-polarized beam with a noncanonical vortex, the X-type vortex, is focused in a high-numerical aperture system.
Han Zhang, Tianhu Zhang, Xinying Zhao, Xiaoyan Pang   +3 more
doaj   +1 more source

Vortex beam array generated by a volume compound fork grating in lithium niobite

Results in Physics, 2021
Here, we report a generation of vortex beam array based on a micro volume compound fork grating fabricated by a femtosecond laser direct writing technique in lithium niobite crystal.
Yu Zhuang, Quanxin Yang, Pengfei Wu, Weigang Zhang, Yingying Ren, Hongliang Liu   +5 more
doaj   +1 more source

Multimodal Data‐Driven Microstructure Characterization

Advanced Engineering Materials, EarlyView.
A self‐consistent autonomous workflow for EBSP‐based microstructure segmentation by integrating PCA, GMM clustering, and cNMF with information‐theoretic parameter selection, requiring no user input. An optimal ROI size related to characteristic grain size is identified.
Qi Zhang, Santiago Benito, Özge Özgün, Sebastian Weber, Markus Stricker   +4 more
wiley   +1 more source

Structured air lasing of N2 +

Communications Physics, 2023
Air lasing is a simple and promising technique to efficiently produce coherent light in the atmosphere. Yet, its capability to obtain structured light like optical vortices or vector beams is still unexplored.
Jingsong Gao, Xiang Zhang, Yang Wang, Yiqi Fang, Qi Lu, Zheng Li, Yi Liu, Chengyin Wu, Qihuang Gong, Yunquan Liu, Hongbing Jiang   +10 more
doaj   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

Microstructure Reconstruction in Battery Electrodes Using Machine Learning Based on Low‐Voltage Focused Ion Beam–Scanning Electron Microscopy Tomography Images

Advanced Engineering Materials, EarlyView.
Low‐voltage FIB‐SEM tomography combined with a image preprocessing pipeline improves phase contrast and enables reliable machine‐learning segmentation of conductive networks in lithium‐ion battery electrodes. Structural descriptors are extracted from segmented images, done semimanually and automated, and compared.
Lisa Beran, Vincent Nebel, Dominik Perius, Kshitij Kumar, Yannis Heim, Laura Bies, Tobias Kraus   +6 more
wiley   +1 more source