Metamaterials 2022, Siena, Italy
September 12 - September 17, 2022 (Mon. - Sat.), Siena Univ.
Trans-Reflective Dual-Mode Terahertz Spatial Light Modulator Using Electrically Tunable Metasurface
Wonwoo Lee, and Hojin Lee
Abstract
Terahertz imaging systems have been extensively studied due to its high-resolution and non-destructive characteristics implementing the considerable potential for security inspection, bio-chemical material identification, and real-time imaging technologies. Despite remarkable progresses, conventional terahertz imaging systems require high power source, expensive detector, and complicate and time-consuming systems. In this regard, single-pixel imaging technique has been implemented into the terahertz range to realize compressive and real-time imaging. However, previous researches only allow the transmissive or reflective imaging technique owing to the passive or absorption type spatial light modulators (SLM). In this work, transmissionreflection dual-mode terahertz spatial light modulator is presented using electrically tunable metasurface based on ion-gel gating graphene metasurface. By applying differential driving voltage on the proposed SLM, differential respective object images could be successfully obtained simultaneously both for transmission and reflection mode exhibiting high correspondence with real objects.
