Manipulation of wave scattering by Fourier convolution operations with Pancharatnam-Berry coding metasurface. (June 2021)

• Record Type: Journal Article
• Authors: Zhao, Tianqi; Jing, Xufeng; Tang, Xiaoyan; Bie, Xun; Luo, Tianzi; Gan, Haiyong; He, Yingwei; Li, Chenxia; Hong, Zhi
• Is Part Of: Optics and lasers in engineering. Volume 141(2021)
• Publication Date: 2021-06
• Subjects: Pancharatnam-Berry phase -- Fourier convolution operations -- Encoding metasurface; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2021.106556
• Languages: English
• ISSNs: 0143-8166

Abstract

Highlights: We propose an encoding metasurface with three-layers C-shaped unit cell structure. The transmission phase from 0 to 2π can be obtained by using different rotation angles of Pancharatnam-Berry encoding elements. Fourier convolution theory in digital signal processing system can be introduced into Pancharatnam-Berry encoding metasurfaces. New different encoding sequences can be acquired by Fourier convolution operation to flexibly control the terahertz scattering with arbitrary scattering angle. Combining Pancharatnam-Berry encoding metasurfaces and Fourier convolution principle can simply realize the flexible control of terahertz scattering. Abstract: We propose an encoding metasurface with three-layers C-shaped unit cell structure. The transmission phase from 0 to 2π can be obtained by using different rotation angles of Pancharatnam-Berry encoding elements. The Pancharatnam-Berry encoding metasurfaces can generate different coding sequences to obtain various deflection angles. Importantly, Fourier convolution theory in digital signal processing system can be introduced into Pancharatnam-Berry encoding metasurfaces. New different encoding sequences can be acquired by Fourier convolution operation to flexibly control the terahertz scattering with arbitrary scattering angle. Thus, combining Pancharatnam-Berry encoding metasurfaces and Fourier convolution principle can simply realize the flexible control of terahertz scattering.