Flat Engineered Multichannel Reflectors

V. S. Asadchy*, A. Diaz-Rubio, S. N. Tcvetkova, D. -H. Kwon, Amr A. Elsakka, M. Albooyeh, S. A. Tretyakov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

53 Citations (Scopus)
156 Downloads (Pure)

Abstract

Recent advances in engineered gradient metasurfaces have enabled unprecedented opportunities for light manipulation using optically thin sheets, such as anomalous refraction, reflection, or focusing of an incident beam. Here, we introduce a concept of multichannel functional metasurfaces, which are able to control incoming and outgoing waves in a number of propagation directions simultaneously. In particular, we reveal a possibility to engineer multichannel reflectors. Under the assumption of reciprocity and energy conservation, we find that there exist three basic functionalities of such reflectors: specular, anomalous, and retroreflections. Multichannel response of a general flat reflector can be described by a combination of these functionalities. To demonstrate the potential of the introduced concept, we design and experimentally test three different multichannel reflectors: three- and five-channel retroreflectors and a three- channel power splitter. Furthermore, by extending the concept to reflectors supporting higher-order Floquet harmonics, we forecast the emergence of other multichannel flat devices, such as isolating mirrors, complex splitters, and multi-functional gratings.

Original languageEnglish
Article number031046
Number of pages13
JournalPhysical Review X
Volume7
Issue number3
DOIs
Publication statusPublished - 14 Sep 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • BAND ANOMALOUS REFLECTION
  • BROAD-BAND
  • GRADIENT METASURFACES
  • WIDE-ANGLE
  • LIGHT
  • METAMATERIALS
  • SURFACES
  • GRATINGS
  • MIRRORS

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