▎ 摘　　要

A graphene-sandwich metasurface for electrically controlled operation as a frequency shifter, a reciprocal switch, and a bidirectional isolator in the terahertz spectral regime was simulated using CST Microwave StudioTM 2019 software. The metasurface is a biperiodic array of identical meta-atoms, each of which comprises a silicon layer with a graphene patch on each of its two faces. The polarization-insensitive metasurface has similar to 15 dB isolation loss as well as similar to 15 dB extinction ratio and can be controlled to function over a wide frequency range. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)