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, cilt.67, sa.1, ss.26-34, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1080/09500340.2018.1554750
  • Dergi Adı: JOURNAL OF MODERN OPTICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.26-34
  • Hacettepe Üniversitesi Adresli: Evet

Özet

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.