Results 81 to 90 of about 5,099,511 (216)

Generation of Multiple‐Depth 3D Computer‐Generated Holograms from 2D‐Image‐Datasets Trained CNN

Advanced Science
Generating computer‐generated holograms (CGHs) for 3D scenes by learning‐based methods can reconstruct arbitrary 3D scenes with higher quality and faster speed. However, the homogenization and difficulty of obtaining 3D high‐resolution datasets seriously
Xingpeng Yan, Jiaqi Li, Yanan Zhang, Hebin Chang, Hairong Hu, Tao Jing, Hanyu Li, Yang Zhang, Jinhong Xue, Xunbo Yu, Xiaoyu Jiang   +10 more
doaj   +1 more source

Optical damage as a computer generated hologram recording mechanism

, 2017
In this paper we report optical damage as a bulk glass recording process. We used a 10Hz, 35picoseconds, 5mJ polarized Nd:YAG pulse laser focused using a 25mm lens to create 50μm average optical damage spots to record a computer generated hologram ...
Olivares Pérez, Arturo, Treviño Palacios, Carlos Gerardo, Zapata Nava, Oscar Javier   +2 more
core   +1 more source

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source

Applications of computer-generated holograms in optical testing [PDF]

, 1980
Optical testing often requires a measurement of the phase difference between light from two different optical systems. One system is a master or reference system, and the other is a sample or test system.
Loomis, John Scott
core   +2 more sources

Real-time 4K computer-generated hologram based on encoding conventional neural network with learned layered phase. [PDF]

Sci Rep, 2023
Zhong C, Sang X, Yan B, Li H, Xie X, Qin X, Chen S.   +6 more
europepmc   +1 more source

A Compact Resistively Loaded Metamaterial Absorber for 2.4 GHz RF Energy Harvesting With Impedance‐Matched Rectifier Analysis

Advanced Electronic Materials, EarlyView.
A compact resistively loaded metamaterial absorber captures RF energy at 2.4 GHz and directs most of the accepted power to modeled loads. The resonant response is confirmed experimentally for the fabricated absorber, while an impedance‐matched rectifier is evaluated through simulation. The stage‐wise results distinguish absorber, rectifier, and cascade
Md. Murad Kabir Nipun, Md. Jahedul Islam
wiley   +1 more source

Broadband Near‐Field Computational Microwave Imaging Enabled by Nonperiodic Dispersive Unit‐Cell Loading in a Passive Metasurface

Advanced Electronic Materials, EarlyView.
A compact passive engineered surface converts changes in microwave frequency into many distinct illumination patterns, allowing nearby objects to be imaged without mechanical scanning, active tuning, or a large antenna array. Operating from 18 to 28 GHz, the single‐port system uses measured field patterns to reconstruct metallic targets and distinguish
Mohammed H. Arif, Firas Slewa Dawod, Henrik Jansen, Caner Kadıoğlu, Sayan Roy, Dirk Heberling, Renato Negra   +6 more
wiley   +1 more source

Monte–Carlo Techniques Applied to CGH Generation Processes and Their Impact on the Image Quality Obtained

Engineering Reports
Computer graphics aim to create visual representations for screens, where depth is simulated. In contrast, Computed Generated Holograms (CGH) focus on encoding and recreating light patterns to generate a true 3D holographic image that appears as a ...
Juan A. Magallón, Alfonso Blesa, Francisco J. Serón   +2 more
doaj   +1 more source

Multi-Depth Computer-Generated Hologram Based on Stochastic Gradient Descent Algorithm with Weighted Complex Loss Function and Masked Diffraction. [PDF]

Micromachines (Basel), 2023
Quan J, Yan B, Sang X, Zhong C, Li H, Qin X, Xiao R, Sun Z, Dong Y, Zhang H.   +9 more
europepmc   +1 more source

Computer generated hologram with characteristics of reflection: reflectance distributions and reflected images [PDF]

, 2009
This paper proposes a new computer generated hologram (CGH) method that considers the reflectance distribution on object surfaces and reflected images.
Sakamoto, Yuji, Yamaguchi, Kazuhiro
core   +1 more source