Affiliation:
1. Shandong University of Science and Technology
Abstract
An electromagnetic wavefront can be flexibly manipulated by discrete
phase coding on the coding unit. In this paper, we designed two coding
metasurfaces with 1-bit and 3-bit based on active tuning of Dirac
semimetals by controlling the Fermi level (E
F
) with an external polarization
voltage. The size and structure of the metasurface remain unchanged
with this strategy. Both designs were found to be dynamically tunable.
The 1-bit coding metasurface enables beam conversion, single-focus
switching, and switching between single-focus and multi-focus. On the
other hand, the 3-bit coding metasurface enables the switching between
vortex beams and single-beam mirror reflections. These proposed
structures have potential applications in terahertz (THz)
communications and terahertz-focused imaging, opening up new
possibilities for the dynamic modulation of THz waves.
Funder
Development Plan of Youth Innovation Team
in Colleges and Universities of Shandong Province
Natural Science Foundation of Shandong
Province
National Natural Science Foundation of
China
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering