Electromagnetic Spatiotemporal Differentiation Meta‐Devices
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Published:2023-09-28
Issue:11
Volume:17
Page:
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ISSN:1863-8880
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Container-title:Laser & Photonics Reviews
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language:en
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Short-container-title:Laser & Photonics Reviews
Author:
Zhou Yi1,
Zhan Junjie1,
Xu Ziyang1,
Shao Yifan1,
Wang Yubo1,
Dang Yongdi1,
Zhang Sen1,
Ma Yungui1ORCID
Affiliation:
1. State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics (Haining Campus) Zhejiang University Hangzhou 310058 China
Abstract
AbstractSpatiotemporal optical computing devices that can perform mathematical operations in both spatial and temporal domains can provide unprecedented measures to build efficient and real‐time information processing systems. It is particularly important to realize the comprehensive functions in a compact design for better integration with electronic components. In this work, an analog spatiotemporal differentiator in microwaves based on an asymmetrical metasurface that has a phase singularity in the spatiotemporal domain is experimentally demonstrated. It is shown that this structure can give rise to a spatiotemporal transfer function required by an ideal first‐order differentiator in both spatial and temporal domains by tailoring the unidirectional excitation of spoof surface plasmon polaritons (SSPPs). The spatial edge detection is performed utilizing a metallic slit, and the temporal differentiation capability of the device is examined by Gaussian‐like temporal pulses of different widths. It is further confirmed that the differentiator demonstrated here can detect sharp changes in spatiotemporal pulses even with intricate profiles and theoretically estimated the resolution limits of the spatial and temporal edge detection. It is also shown that the pulse input after passing the spatiotemporal differentiator implemented here could carry a transverse orbital angular momentum (OAM) with a fractal topology charge.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials