Non-Reciprocal and Collimated Surface Plasmons in Drift-biased Graphene Metasurfaces
Abstract
We explore the unusual non-reciprocal and diffraction-less properties of surface plasmon polaritons propagating in drift-biased graphene-based metasurfaces. We show that applying a drift-current on a graphene sheet leads to extremely asymmetric in-plane modal dispersions from terahertz to infrared frequencies, associated with plasmons with low-loss (high-loss and ultra-high confinement) traveling along (against) the bias. Strikingly, truly unidirectional wave propagation is prevented by the intrinsic nonlocal response of a graphene, a mechanism that shapes the energy flow over the surface. We also show that highly-directive hyperbolic plasmons completely immune to backscattering propagate obliquely along the drift in nanostructured graphene. Finally, we discuss how spin-orbit interactions can be exploited in this platform to efficiently launch collimated plasmons along a single direction while maintaining giant non-reciprocal responses. Our findings open a new paradigm to excite, collimate, steer, and process surface plasmons over a broad frequency band.
Keywords
Cite
@article{arxiv.1905.10699,
title = {Non-Reciprocal and Collimated Surface Plasmons in Drift-biased Graphene Metasurfaces},
author = {D. Correas-Serrano and J. S. Gomez-Diaz},
journal= {arXiv preprint arXiv:1905.10699},
year = {2019}
}