Optically and electrically tunable Dirac points and Zitterbewegung in graphene-based photonic superlattices

Hanying Deng, Fangwei Ye, Boris A. Malomed, Xianfeng Chen, Nicolae C. Panoiu

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate that graphene-based photonic superlattices provide a versatile platform for electrical and all-optical control of photonic beams with deep-subwavelength accuracy. Specifically, by inserting graphene sheets into periodic metallodielectric structures, one can design optical superlattices that possess photonic Dirac points (DPs) at frequencies at which the spatial average of the permittivity of the superlattice ?¯ vanishes. Similar to the well-known zero-n¯ band gaps, we show that these zero-?¯ DPs are highly robust against structural disorder. We also show that, by tuning the graphene permittivity via the optical Kerr effect or electrical doping, one can induce a spectral variation of the DP exceeding 30 nm, at mid-IR and THz frequencies. The implications of this wide tunability for the photonic Zitterbewegung effect in a vicinity of the DP are also explored.

Original languageEnglish
Article number201402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number20
DOIs
StatePublished - 5 May 2015

Fingerprint

Dive into the research topics of 'Optically and electrically tunable Dirac points and Zitterbewegung in graphene-based photonic superlattices'. Together they form a unique fingerprint.

Cite this