Metagratings: A novel paradigm for efficient wavefront control

Dimitrios L. Sounas, Younes Ra'Di, Andrea Alu

Research output: Chapter in Book/Entry/PoemConference contribution

Abstract

Metasurfaces have recently gained a lot of attention in the context of beam steering, but they are subject to fundamental limitations regarding their efficiency, that cannot be overcome unless we use active or nonlocal materials. Here we show that these limitations can be overcome if we approach the problem of beam steering from a grating perspective. We show that by using metamaterial elements as the building blocks of a periodic lattice we can achieve extreme beam steering with unitary efficiency, if these elements are designed to cancel all the diffraction orders supported by the lattice apart from the one where we want to reroute an incident wave. We call such structures metagratings, in order to highlight the two main aspects of such structures, the grating principle and the metamaterial elements forming it.

Original languageEnglish (US)
Title of host publication2018 International Applied Computational Electromagnetics Society Symposium in Denver, ACES-Denver 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9780996007870
DOIs
StatePublished - May 23 2018
Externally publishedYes
Event2018 International Applied Computational Electromagnetics Society Symposium in Denver, ACES-Denver 2018 - Denver, United States
Duration: Mar 25 2018Mar 29 2018

Publication series

Name2018 International Applied Computational Electromagnetics Society Symposium in Denver, ACES-Denver 2018

Conference

Conference2018 International Applied Computational Electromagnetics Society Symposium in Denver, ACES-Denver 2018
Country/TerritoryUnited States
CityDenver
Period3/25/183/29/18

Keywords

  • beam steering
  • gratings
  • metagratings
  • metamaterial's
  • metasurfaces

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computational Mathematics
  • Numerical Analysis
  • Instrumentation

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