Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials.

ABSTRACT: Active control of polarization states of electromagnetic waves is highly desirable because of its diverse applications in information processing, telecommunications, and spectroscopy. However, despite the recent advances using artificial materials, most active polarization control schemes require optical stimuli necessitating complex optical setups. We experimentally demonstrate an alternative-direct electrical tuning of the polarization state of terahertz waves. Combining a chiral metamaterial with a gated single-layer sheet of graphene, we show that transmission of a terahertz wave with one circular polarization can be electrically controlled without affecting that of the other circular polarization, leading to large-intensity modulation depths (>99%) with a low gate voltage. This effect

SUBMITTER: Kim TT 

PROVIDER: S-EPMC5621972 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature