Controlling steady-state second harmonic signal via linear and nonlinear Fano resonances
JOURNAL OF MODERN OPTICS, vol.67, no.1, pp.26-34, 2020 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 67 Issue: 1
- Publication Date: 2020
- Doi Number: 10.1080/09500340.2018.1554750
- Journal Name: JOURNAL OF MODERN OPTICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.26-34
- Open Archive Collection: AVESIS Open Access Collection
- Hacettepe University Affiliated: Yes
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.