Space-Time Metasurfaces for Power Combining of Waves

Xuchen Wang*, Viktar S. Asadchy, Shanhui Fan, Sergei A. Tretyakov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)
181 Downloads (Pure)

Abstract

In passive, linear, and monochromatic systems, complete and phase-insensitive combining of powers carried by waves from several input channels into a single output channel is forbidden by the energy conservation law. Here, we demonstrate that the complete combination of both coherent and incoherent plane waves can be achieved using metasurfaces with properties varying in space and time. The proposed structure reflects waves of the same frequency but incident at different angles toward a single direction. The frequencies of the output waves are shifted by the metasurface, ensuring perfect incoherent power combining. The proposed concept of power combining is general and can be applied for electromagnetic waves from the microwave to optical domains, as well as for waves of other physical natures.

Original languageEnglish
Pages (from-to)3034-3041
Number of pages8
JournalACS Photonics
Volume8
Issue number10
Early online date2021
DOIs
Publication statusPublished - 20 Oct 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • beam combination
  • Floquet theorem
  • frequency conversion
  • high-power sources
  • incoherent excitation
  • photon flux
  • time-varying materials

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