Enhanced Second-Harmonic Generation by Metasurface Nanomixer and Nanocavity

Pai Yen Chen, Christos Argyropoulos, Giuseppe D'Aguanno, Andrea Alù

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We discuss the possibility of largely enhancing the nonlinear second-harmonic generation (SHG) from Ξ(2) nonlinear materials using metasurfaces consisting of suitably engineered optical nanoantenna arrays. The proposed setup may increase the SHG conversion efficiency by orders of magnitude, compared to a thin film of Ξ(2) nonlinear material of the same thickness. This enhancement is attributed to localized fields at the nanoload, due to the plasmonic resonance of noble-metal nanoantennas, combined with a suitably enhanced photonic local density of states induced by properly coupling two closely spaced metasurfaces to form a nanocavity to enhance SHG. The proposed subwavelength optical device can lead to versatile applications, such as wavelength conversion and wave mixing at the nanoscale.

Original languageEnglish (US)
Pages (from-to)1000-1006
Number of pages7
JournalACS Photonics
Volume2
Issue number8
DOIs
StatePublished - Aug 19 2015

All Science Journal Classification (ASJC) codes

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

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