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Convolution operations on time-domain digital coding metasurface for beam manipulations of harmonics

2020; De Gruyter; Volume: 9; Issue: 9 Linguagem: Inglês

10.1515/nanoph-2019-0538

2192-8606

Cheng Zhang, Jin Yang, Yang Liu, Jun Ke, Ming Zheng Chen, Wen Kang Cao, Mao Chen, Zhan Hao Wu, Jianfeng Chen, Qiang Cheng, Tie Jun Cui,

Antenna Design and Analysis

Abstract Time-domain digital coding metasurfaces have been proposed recently to achieve efficient frequency conversion and harmonic control simultaneously; they show considerable potential for a broad range of electromagnetic applications such as wireless communications. However, achieving flexible and continuous harmonic wavefront control remains an urgent problem. To address this problem, we present Fourier operations on a time-domain digital coding metasurface and propose a principle of nonlinear scattering-pattern shift using a convolution theorem that facilitates the steering of scattering patterns of harmonics to arbitrarily predesigned directions. Introducing a time-delay gradient into a time-domain digital coding metasurface allows us to successfully deviate anomalous single-beam scattering in any direction, and thus, the corresponding formula for the calculation of the scattering angle can be derived. We expect this work to pave the way for controlling energy radiations of harmonics by combining a nonlinear convolution theorem with a time-domain digital coding metasurface, thereby achieving more efficient control of electromagnetic waves.