Modulation of mid-IR radiation by a gated graphene on ferroelectric substrate

Abstract

We demonstrate theoretically a possibility for modulation of mid-IR radiation by low-voltage gated single/multilayer graphene placed on ferroelectric Pb[Zr(x)Ti(1-x)]O3 (PZT) substrate. In the range of gate voltages where thin epitaxial PZT films behave as high-permittivity dielectrics, the modulation depth for the case of five-layer graphene can be as high as 10%.