Controlling steady-state second harmonic signal via linear and nonlinear Fano resonances


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Guenay M., Artvin Z. , BEK A. , TAŞGIN M. E.

JOURNAL OF MODERN OPTICS, vol.67, no.1, pp.26-34, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 67 Issue: 1
  • Publication Date: 2020
  • Doi Number: 10.1080/09500340.2018.1554750
  • Title of Journal : JOURNAL OF MODERN OPTICS
  • Page Numbers: pp.26-34
  • Keywords: Quantum plasmonics, nonlinear optics, Fano resonance, INDUCED TRANSPARENCY, ENHANCEMENT, GENERATION

Abstract

Nonlinear signal even from a single molecule becomes visible at hot spots of plasmonic nanoparticles. In these structures, Fano resonances can control the nonlinear response in two ways. (i) A linear Fano resonance can enhance the hot spot field, resulting enhanced nonlinear signal. (ii) A nonlinear Fano resonance can enhance the nonlinear signal without enhancing the hot spot. In this study, we compare the enhancement of second harmonic signal at the steady-state obtained via these two methods. Since we are interested in the steady-state signal, we adapt a linear enhancement which works at the steady-state. This is different than the dark-hot resonances that appear in the transparency window due to enhanced plasmon lifetime.