Results 61 to 70 of about 1,618 (216)

Wavefront coding for athermalization of infrared imaging systems

, 2004
Wavefront coding involves the insertion of an asymmetric refractive mask close to the pupil plane of an imaging system so as to encode the image with a specific point spread function that, when combined with decoding of the recorded image, can enable ...
Muyo, Gonzalo, Andrew R. Harvey, Harvey, AR, Muyo, G, Harvey, Andrew R., Gonzalo D. Muyo   +5 more
core   +1 more source

Metasurface‐Enabled Active‐Like Passive Radar

Advanced Science, EarlyView.
A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li, Jiawen Xu, Hanting Zhao, Xu Zhao, Yanjin Chen, Tie Jun Cui, Vincenzo Galdi, Lianlin Li   +7 more
wiley   +1 more source

Non‐Uniform Space‐Time‐Coding Modulation for Low‐Complexity Diagnostics of Reconfigurable Intelligent Surfaces

Advanced Electronic Materials, EarlyView.
A diagnostic method for reconfigurable intelligent surfaces (RIS) based on non‐uniform space‐time‐coding modulation is presented. Fault localization is achieved via amplitude‐only spectral measurements, eliminating the need for complex signal processing. A one‐to‐one mapping between harmonic components and RIS elements enables accurate detection.
Xiao Qing Chen, Lei Zhang, Yi Ning Zheng, Bing Bing Zhu, Marco Rossi, Giuseppe Castaldi, Shuo Liu, Vincenzo Galdi, Tie Jun Cui   +8 more
wiley   +1 more source

Tbit/s line-rate satellite feeder links enabled by coherent modulation and full-adaptive optics

Light: Science & Applications, 2023
Free-space optical (FSO) communication technologies constitute a solution to cope with the bandwidth demand of future satellite-ground networks. They may overcome the RF bottleneck and attain data rates in the order of Tbit/s with only a handful of ...
Yannik Horst, Bertold Ian Bitachon, Laurenz Kulmer, Jannik Brun, Tobias Blatter, Jean-Marc Conan, Aurélie Montmerle-Bonnefois, Joseph Montri, Béatrice Sorrente, Caroline B. Lim, Nicolas Védrenne, Daniel Matter, Loann Pommarel, Benedikt Baeuerle, Juerg Leuthold   +14 more
doaj   +1 more source

Miniaturization and simplification of zoom lenses using wavefront coding

, 2008
Traditional zoom lens designs employ multiple moving lens elements to provide simultaneous control of focal length and focal plane. We present an approach to a design of a simplified zoom lens by employing a single moving element to control only the ...
Demenikov, Mads, Andrew R. Harvey, Demenikov, M, Harvey, AR, Findlay, E, Harvey, Andrew R., Ewan Findlay, Findlay, Ewan, Mads Demenikov   +8 more
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

Twisting Polarization‐Tunable Subdiffraction‐Limited Magnetization through Vectorial Beam Coupling

Advanced Photonics Research, 2022
All‐optical control of magnetization vectors is considered as a powerful solution that empowers the development of multifunctional integrated optomagnetic devices.
Xiaofei Liu, Weichao Yan, Yue Liang, Zhongquan Nie, Yuxiao Wang, Zehui Jiang, Yinglin Song, Xueru Zhang   +7 more
doaj   +1 more source

Wavefront coding for aberration compensation in thermal imaging systems

, 2001
As improving manufacturing techniques drive down the expense of imaging detector arrays, the total costs of future thermal imaging systems will become increasingly dominated by the manufacturing costs of the complex lens systems that are necessary for ...
Andrew R. Harvey, Harvey, AR, Mezouari, Samir, Mezouari, S, Harvey, Andrew R., Samir Mezouari   +5 more
core   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Laser protection by using vortex wavefront coding imaging system

AIP Advances
Laser blindness can reduce or disable the information acquisition ability of photoelectric imaging systems. In this paper, numerical simulation and experimental verification are both performed to systematically study the laser protection performance of ...
Yangliang Li, Haoqi Luo, Qing Ye, Yunlong Wu, Junyu Zhang, Dake Chen, Xiaoquan Sun   +6 more
doaj   +1 more source