Transmission-Reflection Terahertz Spatial Light Modulator Using Electrically Tunable Dual-Mode Metamaterial

Wonwoo Lee, Hyunwoo Jo, Moon Sung Kang, and Hojin Lee

Abstract

  Terahertz imaging system has been extensively studied due to its high-solution 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 system requires 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 allow the only transmissive or reflective imaging techniques owing to the passive or absorption type spatial light modulators (SLM). In this work, transmission-reflection terahertz spatial light modulator is presented using electrically tunable dual-mode metamaterial. By applying differential driving voltage on SLM, differential respective object images could be successfully obtained both for transmission and reflection mode exhibiting high correspondence with real objects based on dual-mode terahertz single-pixel imaging system.

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.