Multifunctional dual stimuli-triggered metadevice in terahertz regime

Abstract

Multifunctional metadevices have garnered substantial attention because of their optical characteristics for operation within the terahertz regime. However, metasurfaces have unalterable geometrical configurations that represent a limitation in this context, thus necessitating dynamic adjustability of the structures. In this study, a development strategy is used that involves a dual stimuli-responsive programmable terahertz metamaterial based on indium oxide (In2O3). When exposed to light irradiation, the resonant frequency of this metamaterial undergoes a red shift of up to approximately 100 GHz when compared with the original resonant frequency. The processed terahertz signal is then used for binary coding as well as computer color coding through two active stimulation methods. This dual stimuli-triggered metamaterial concept can be extended to other frequency bands and thus offers a promising route toward electromagnetic information processing applications.