A liquid crystal-based multi-bit terahertz reconfigurable intelligent surface

A liquid crystal-based multi-bit terahertz reconfigurable intelligent surface

11 January 2024 | Ze Shen, Weili Li, Biaobing Jin, Dixian Zhao
This study presents a multi-bit liquid crystal (LC)-based reconfigurable intelligent surface (RIS) for terahertz (THz) applications. The proposed RIS is designed to programmably control THz waves, achieving a 3-bit working state and a near 270° maximum phase shift around 0.28 THz. This high degree of freedom in phase manipulation allows for flexible spatial beam reconfigurations, including steering a single-beam pattern from 5° to 55°, adjusting the beam number, and modifying the beamwidth. The RIS is fabricated using clean room processes compatible with standard LCD technology, enabling easy programming and mass production. Numerical simulations and measurements demonstrate the effectiveness of the RIS in steering beams and broadening beamwidths, with a switching speed of 160 ms. The device's performance is influenced by the LC extinction coefficient and fabrication tolerance, with low-loss LC materials and precise nanofabrication processes showing potential for improved performance. This work contributes to the advancement of THz RIS technologies, paving the way for applications such as THz wireless communications, broadcasting, and localization.This study presents a multi-bit liquid crystal (LC)-based reconfigurable intelligent surface (RIS) for terahertz (THz) applications. The proposed RIS is designed to programmably control THz waves, achieving a 3-bit working state and a near 270° maximum phase shift around 0.28 THz. This high degree of freedom in phase manipulation allows for flexible spatial beam reconfigurations, including steering a single-beam pattern from 5° to 55°, adjusting the beam number, and modifying the beamwidth. The RIS is fabricated using clean room processes compatible with standard LCD technology, enabling easy programming and mass production. Numerical simulations and measurements demonstrate the effectiveness of the RIS in steering beams and broadening beamwidths, with a switching speed of 160 ms. The device's performance is influenced by the LC extinction coefficient and fabrication tolerance, with low-loss LC materials and precise nanofabrication processes showing potential for improved performance. This work contributes to the advancement of THz RIS technologies, paving the way for applications such as THz wireless communications, broadcasting, and localization.
Reach us at info@study.space