Mode-Matching Enhancement of Second-Harmonic Generation with Plasmonic Nanopatch Antennas

Ahsan Noor, Anoop R. Damodaran, In Ho Lee, Stefan A. Maier, Sang Hyun Oh, Cristian Ciracì

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)

Abstract

Plasmonic enhancement of nonlinear optical processes confront severe limitations arising from the strong dispersion of metal susceptibilities and small interaction volumes that hamper the realization of desirable phase-matching-like conditions. Maximizing nonlinear interactions in nanoscale systems require simultaneous excitation of resonant modes that spatially and constructively overlap at all wavelengths involved in the process. Here, we present a hybrid rectangular patch antenna design for optimal second-harmonic generation (SHG) that is characterized by a non-centrosymmetric dielectric/ferroelectric material at the plasmonic hot spot. The optimization of the rectangular patch allows for the independent tuning of various modes of resonances that can be used to enhance the SHG process. We explore the angular dependence of SHG in these hybrid structures and highlight conditions necessary for the maximal SHG efficiency. Furthermore, we propose a novel configuration with a periodically poled ferroelectric layer for an orders-of-magnitude enhanced SHG at normal incidence. Such a platform may enable the development of integrated nanoscale light sources and on-chip frequency converters.

Original languageEnglish
Pages (from-to)3333-3340
Number of pages8
JournalACS Photonics
Volume7
Issue number12
DOIs
Publication statusPublished - 16 Dec 2020
Externally publishedYes

Keywords

  • ferroelectrics
  • hybrid plasmonics
  • nanopatch antenna
  • nonlinear optics
  • Plasmonics
  • second-harmonic generation

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