Ultra-thin terahertz devices based on Pancharatnam-Berry phase

Abstract

The ultra-thin terahertz functional devices have huge application prospects in information communication, national defense security and energy exploration. However, traditional devices based on propagation phase accumulation often face the problems of large size and low efficiency, unable to achieve complex control of terahertz spectrum and wavefront distribution. These problems seriously hinder the development of terahertz technology in practical applications. The Pancharatnam-Berry(PB) phase metasurface is composed of the same artificial microstructure with different rotation angles. It can realize the phase mutation of the reflected (transmitted) wave by simply changing the rotation angle of the microstructure, thereby realizing the phase gradient or distribution. In this paper, we design a onedimensional focusing lens and a one-dimensional deflector working at 1.17 THz with the designed meta-atoms based on the working principles of PB metasurface, and the thickness of these two devices is only 26 um.