Tunable broadband terahertz beam splitting using gated graphene metasurfaces [Invited]

Abstract

Active control of split ratios in terahertz (THz) beam splitters holds substantial potential for applications imaging and spectroscopy. In this study, we introduce an approach electrically controlling THz splitting with near non-dispersive characteristics, using the metasurface hybridized single-layer graphene. Specifically, resonant frequency is meticulously chosen to provide enhanced effective conductivity that almost frequency-independent. Furthermore, ratio can be manipulated by adjusting gate voltage applied graphene, thereby altering hybrid without affecting its transmission reflection characteristics. The feasibility our confirmed across a wide operating range, from 0.5 1.5 THz. demonstration efficient, broadband, tunable ability validates gated graphene metasurfaces advanced applications.