Abstract-Dynamic Terahertz Beam Steering Based on Graphene Metasurfaces

Liming Liu, Yair Zarate, Haroldo T. Hattori

http://www.mathpubs.com/detail/1512.05425v1/Dynamic-Terahertz-Beam-Steering-Based-on-Graphene-Metasurfaces

A full (2π) phase modulation is critical for efficient wavefront manipulation. In this article, we propose a metasurface based on graphene long/short-strip resonators which are capable of implementing a dynamic 2π phase modulation by applying different voltages to different graphene resonators. The configuration is found to have high reflection efficiency (minimum 56%) and has a full phase modulation in a wide frequency range. Terahertz (THz) beam steering as large as 120 degrees (±60∘) is demonstrated in a broad frequency range (1.2 to 1.9 THz) by changing the Fermi levels of different graphene resonators accordingly. This metasurface can provide a new platform for effectively manipulating THz waves.