Tunable Graphene Metasurface Reflectarray for Cloaking, Illusion, and Focusing

Sudipta Romen Biswas, Cristian E. Gutiérrez, Andrei Nemilentsau, In Ho Lee, Sang Hyun Oh, Phaedon Avouris, Tony Low

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

This paper is a contribution to the Physical Review Applied collection in memory of Mildred S. Dresselhaus.We present a graphene-based metasurface that can be actively tuned between different regimes of operation, such as anomalous beam steering and focusing, cloaking, and illusion optics, by applying electrostatic gating without modifying the geometry of the metasurface. The metasurface is designed by placing graphene ribbons on a dielectric cavity resonator, where interplay between geometric plasmon resonances in the ribbons and Fabry-Perot resonances in the cavity is used to achieve a 2π phase shift. As a proof of concept, we demonstrate that the wave front of the field reflected from a triangular bump covered by the metasurface can be tuned by applying electric bias so as to resemble that of a bare plane and of a spherical object. Moreover, reflective focusing and the change of the reflection direction for the above mentioned cases are also shown.

Original languageEnglish (US)
Article number034021
JournalPhysical Review Applied
Volume9
Issue number3
DOIs
StatePublished - Mar 23 2018

    Fingerprint

How much support was provided by MRSEC?

  • Partial

Reporting period for MRSEC

  • Period 5

Cite this