Terahertz (THz) is an unexplored range in the electromagnetic spectrum. It shows promises in many important applications, from 6G communications to security scans of prohibited drugs. However, due to the long wavelength, THz components are usually very bulky. In our group, we work on the miniaturization of THz components with metasurfaces and silicon photonic technologies. We have developed THz silicon metalenses that can be fabricated with low-cost photolithography. These metalenses have ultrathin thicknesses on the order of a wavelength. With dispersion engineering, we can design achromatic metalenses that can operate from 0.5 THz to 1.5 THz. We also leverage the tunability of silicon photonics to realize active THz devices.
Relevant Publications:
- Terahertz metalenses fabricated with photolithography, Guan-Bo Lin, Tsung-Chieh Tseng, Yu-Hang Wang, Jian-Yu Wu, Peichen Yu, Shang-Hua Yang, and You-Chia Chang, OPTIC, 2021-SAT-S0106-O005, 2021.