Saturday, December 19, 2015

Abstract-Dynamic Terahertz Beam Steering Based on Graphene Metasurfaces

Liming LiuYair ZarateHaroldo T. Hattori

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.

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