Nano-printing technology based double-spiral terahertz tunable metasurface

Abstract

Electromagnetic devices made of artificially constructed metasurfaces can achieve filtering, modulation, sensing, and detection functions in the terahertz frequency band, which is essential for the application of terahertz waves in the fields of communication and imaging. We designed and prepared a flexible and transparent double helix metasurface based on nano-printing technology, and used the metasurface to construct a rotating tunable filter, which can achieve regular tuning of the terahertz wave transmittance by rotating the metasurface. After rotating by 90°, the transmittance at 0.52THz increased from 8% to 67%, and the transmittance at 0.92THz decreased from 68% to 3%, realizing active tuning with modulation depth greater than 88%. Moreover, the proposed Nano-printing metasurfaces have excellent properties of ultra-thinness, flexibility, and visible light transparency, which is conducive to the miniaturization, light-weight and large-area preparation of terahertz tunable devices.