Analog signal processing through space-time digital metasurfaces

被引：40

作者：

Rajabalipanah H. ^{[1
]}

Abdolali A. ^{[1
]}

Iqbal S. ^{[2
]}

Zhang L. ^{[2
]}

Cui T.J. ^{[2
]}

机构：

[1] Applied Electromagnetic Laboratory, School of Electrical Engineering, Iran University of Science and Technology, Tehran

[2] School of Information Science and Engineering, State Key Laboratory of Millimeter Waves, Southeast University, Nanjing

来源：

Nanophotonics | 2021年 / 10卷 / 06期

关键词：

signal processing; space-time digital metasurfaces; spatial differentiation and integration;

D O I：

10.1515/nanoph-2021-0006

中图分类号：

学科分类号：

摘要：

In the quest to realize analog signal processing using subwavelength metasurfaces, in this paper, we present the first demonstration of programmable time-modulated metasurface processors based on the key properties of spatial Fourier transformation. Exploiting space-time coding strategy enables local, independent, and real-time engineering of not only amplitude but also phase profile of the contributing reflective digital meta-atoms at both central and harmonic frequencies. Several illustrative examples are demonstrated to show that the proposed multifunctional calculus metasurface is capable of implementing a large class of useful mathematical operators, including 1st- and 2nd-order spatial differentiation, 1st-order spatial integration, and integro-differential equation solving accompanied by frequency conversions. Unlike the recent proposals based on the Green's function (GF) method, the designed time-modulated signal processor effectively operates for input signals containing wide spatial frequency bandwidths with an acceptable gain level. Proof-of-principle simulations are also reported to demonstrate the successful realization of image processing functions like edge detection. This time-varying wave-based computing system can set the direction for future developments of programmable metasurfaces with highly promising applications in ultrafast equation solving, real-time and continuous signal processing, and imaging. © 2021 Hamid Rajabalipanah et al., published by De Gruyter, Berlin/Boston 2021.

引用

页码：1753 / 1764

页数：11

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