Graphene-strontium titanate-based metamaterial for optical sensing

Abstract

Switching and/or sensing characteristics of a specially designed three-layer metamaterial configuration were studied. In particular, the top metasurface is comprised of squared pixels of strontium titanate (SrTiO3) and graphene mediums, deposited over an InSb nanolayer; the SiO2 dielectric medium constitutes the bottom substrate. The proposed structure could be artificially controlled and tuned, and therefore, the effects due to altering ambient temperature, graphene chemical potential and magnetostatic bias were studied. The results exhibit high sensitivity resonance transmission in the THz frequency range. The optical switching ON/OFF states of the structure, as represented in the form of transmission spectra, were reported supporting very high (~98%) or almost vanishing transmission.