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Enhancement of Transmission Efficiency on Pancharatnam−Berry Geometric Phase Encoding Metasurfaces
Author(s) -
Tang Xiaoyan,
Li Chenxia,
Gan Haiyong,
He Yingwei,
Jing Xufeng,
Fang Bo,
Hong Zhi
Publication year - 2021
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.202000494
Subject(s) - optics , geometric phase , transmission coefficient , conical surface , transmission (telecommunications) , polarization (electrochemistry) , physics , phase (matter) , wavefront , materials science , optoelectronics , computer science , telecommunications , chemistry , quantum mechanics , composite material
The modulation of the required light wavefront polarization and phase based on the geometric phase encoding metasurface (GPEM) has recently become a hot topic. However, the transmission coefficient of a geometric phase metasurface is greatly decreased when the structure is rotated. To address this problem, a solution of adding a tapered antireflection layer to the substrate and design an all‐dielectric encoding metasurface composed of titanium dioxide and silicon dioxide in the visible light band with a transmission coefficient of 93.65%, is proposed. When circularly polarized light is incident on the designed encoding metasurfaces with rotating unit structures, the GPEM still maintain almost perfect transmission coefficient as with initial linearly polarized light is incident. By comparing the coded metasurface with and without conical structure, the coded metasurface with conical structure can greatly improve transmission efficiency. Importantly, the Fourier convolution theorem in digital signal processing is introduced on encoding metasurfaces. The scattering angle of transmission can be controlled arbitrarily by the all‐dielectric coded metasurface with Fourier convolution addition and subtraction operations.