Results 61 to 70 of about 3,939 (278)

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

A Programmable Multi‑Modal Information Encryption System Based on the Dynamic Wetting Behavior of Liquid Metal

Advanced Science, EarlyView.
This work presents a programmable multimodal information encryption device that harnesses the dynamic wetting behavior of liquid metal to achieve secure, reconfigurable, and high‐precision encryption and decryption of diverse data types, including text and images.
Xuedong Qiang, Min Mao, Yihao Wang, Nan Li, Mengyu Jiang, Chenkun Sun, Bangdeng Du, Jifei Ye, Linyan Wang, Fei Zhan, Lei Wang   +10 more
wiley   +1 more source

Spin and wavelength multiplexed nonlinear metasurface holography

Nature Communications, 2016
Metasurfaces offer an approach for computer generated holograms with good efficiency and ease of fabrication. Here, Ye et al.report on spin and wavelength multiplexed nonlinear metasurface holography, showing construction of holographic images using ...
Weimin Ye, Franziska Zeuner, Xin Li, Bernhard Reineke, Shan He, Cheng-Wei Qiu, Juan Liu, Yongtian Wang, Shuang Zhang, Thomas Zentgraf   +9 more
doaj   +1 more source

Computer Generated Holograms (CGH) for Testing, Alignment and Positioning of Astronomical and Space Mirrors Aspherical Surfaces [PDF]

EPJ Web of Conferences, 2019
JSC LZOS successfully applies Computer Generated Holograms (CGH) for testing of on- and off-axis surfaces of large-dimensioned optical components for their alignment with respect to interferometer, for defining of aspherical surface optical vertex ...
Semenov Aleksandr, Abdulkadyrov Magomed, Dobrikov Nikolay, Ignatov Aleksandr, Patrikeev Vladimir, Pridnya Vitaliy, Polyanchikov Andrey, Nasyrov Ruslan   +7 more
doaj   +1 more source

Super‐Resolution and High‐Data‐Density Acoustic Meta‐Hologram via Amplitude and Phase Coupling

Advanced Science, EarlyView.
A super‐resolution acoustic meta‐hologram utilizes amplitude‐phase coupling under energy conservation constraints to overcome the traditional diffraction limit. This conceptually advanced approach achieves high‐fidelity acoustic field reconstruction and dense information transmission, unlocking new potentials for high‐resolution acoustic imaging and ...
Xiao Guo, Xinzong Wang, Guoshen Tang, Haohan Zeng, Siqi Fan, Xinghao Hu, Youyu Mo, Zhenyu He, Tingting Li, Hui Xu, Jiao Shen, Haiyan Fan, Xiaoxiang Gao, Yifan Zhu, Hui Zhang, Badreddine Assouar   +15 more
wiley   +1 more source

Fabrication of Dynamic Holograms on Polymer Surface by Direct Laser Writing for High-Security Anti-Counterfeit Applications

IEEE Access, 2019
Anti-counterfeit technology has attracted much attention with the development of economy, because many counterfeit products that are difficult for identification have been produced, which extremely damage the interests of consumers.
Jiahao Miao, Xinghuo Ding, Shengjun Zhou, Chengqun Gui   +3 more
doaj   +1 more source

Coherent Optical Pattern Recognition Using Computer-Generated Holograms

, 1991
Coherent optical pattern recognition using computer-generated holograms A relatively inexpensive optical processing system is described which uses a TV camera to demonstrate visually many of the features of Fourier transform theory with particular ...
S. S. Ipson, K. F. Chang, W. Booth
core   +1 more source

Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective

Advanced Electronic Materials, EarlyView.
Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe, Ivan Iudice, Giuseppe Castaldi, Marco Di Renzo, Vincenzo Galdi   +4 more
wiley   +1 more source

High-Resolution Spectrometer-on-Chip Based on Digital Planar Holography

IEEE Photonics Journal, 2011
Digital planar holography enables the creation of a new generation of integrated photonic circuits with desired transfer function. We give here, for the first time, the basis for designing computer-generated planar holograms and demonstrate their ...
Christophe Peroz, Alexander Goltsov, Scott Dhuey, Pavel Sasorov, Bruce Harteneck, Igor Ivonin, Sergey Kopyatev, Stefano Cabrini, Sergey Babin, Vladimir Yankov   +9 more
doaj   +1 more source

Real-time terahertz meta-cryptography using polarization-multiplexed graphene-based computer-generated holograms

Nanophotonics, 2020
As one of the cutting-edge technologies in advanced information science, wave-based cryptography is a prerequisite to enable a plethora of secure encrypting platforms which can be realized by smart multiplexing techniques together with suitable ...
Rajabalipanah Hamid, Rouhi Kasra, Abdolali Ali, Iqbal Shahid, Zhang Lei, Liu Shuo   +5 more
doaj   +1 more source