Reconfigurable Metagratings

Younes Ra'Di, Andrea Alù

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

Abstract

Recently, it was revealed that gradient metasurfaces based on continuous gradients of the local reflection and/or transmission coefficients are fundamentally limited on their overall efficiency in transformation of an impinging wavefront. In addition, due to the fastly varying impedance profile that these surfaces require, they usually need high-resolution fabrication processes. To address these issues, the concept of metagrating was recently put forward, enabling engineered surfaces capable of manipulating light with unitary efficiency. Metagratings are periodic arrays of carefully designed scatterers that, in contrast with conventional metasurfaces, do not need to support a continuous gradient surface impedance, and consequently, are far simpler to fabricate. Building up on this concept, here we explore opportunities to realize reconfigurable multifunctional metagratings. The proposed designs provide a highly efficient reconfigurable platform tuned by electrostatically biasing simply structured graphene sheets, paving the way to a new generation of highly efficient designer surfaces.

Original languageEnglish (US)
Pages (from-to)1779-1785
Number of pages7
JournalACS Photonics
Volume5
Issue number5
DOIs
StatePublished - May 16 2018
Externally publishedYes

Keywords

  • anomalous reflection
  • diffraction grating
  • gradient metasurfaces
  • graphene
  • metagrating
  • metasurface

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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