Reconfigurable terahertz rainbow deflector

Abstract

Dynamic terahertz (THz) beam steering is a promising technique for numerous applications, including communication, high-resolution imaging, and radar. However, advances in this technology are considerably limited by inadequate broadband and active phase shifters at THz frequencies. In this paper, we developed a type of VO2-based device capable of broadband THz beam steering. The effect of the tunable Brewster angle of the VO2 thin film along with the insulator-to-metal transition process was verified. We demonstrated that the VO2 grating could realize a dispersive beam deflector in a broad frequency band. Furthermore, upon heating, the VO2 grating could switch between three states of mirror reflector, “rainbow” deflector, and metallic grating. We believe that the proposed reconfigurable and broadband THz beam deflector offers a powerful avenue for manipulating THz beams.

Polarization and frequency multiplexed multi-channel focusing terahertz vortex with a birefringent dielectric metasurface

“…Moreover, the electromagnetic response frequency of metasurface can be tailored in the THz band by controlling the size of metaatoms, overcoming the disadvantage of most natural materials being unable to respond to THz waves [23]. So far, metasurfaces have been widely adopted in many THz applications, such as THz beam deflectors [24], THz lenses [23,25,26], THz holograms [27,28], and TVB generators [29]. Among the reported metasurface-based TVB generators, geometric phase is widely used, achieving effective control of the carried OAM [7,30].…”

Programmable Terahertz Metamaterials with Non‐Volatile Memory

“…[7,8] A variety of metamaterial-based THz SLM has been demonstrated and used for information procession. The reconfigurability of THz wave modulation in these designs relied on tunable materials such as semiconductors, [9,10] liquid crystals, [11,12] graphene, [13] and phase-change materials (PCM) [14,15,16] or micro-mirror arrays [17,18,19] and microfluidics. [20] Toward practical applications, new challenges have emerged.…”