Nonresonant Local Fields Enhance Second-Harmonic Generation from Metal Nanoislands with Dielectric Cover

We study second-harmonic generation from gold nanoislands covered with amorphous titanium oxide (TiO_{2}) films. As the TiO_{2} thickness increases, the plasmon resonance of the nanoislands shifts away from the second-harmonic wavelength of 532 nm, diminishing the resonant enhancement of the process...

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Bibliographic Details
Published inPhysical review letters Vol. 120; no. 11; p. 113902
Main Authors Chervinskii, Semyon, Koskinen, Kalle, Scherbak, Sergey, Kauranen, Martti, Lipovskii, Andrey
Format Journal Article
LanguageEnglish
Published United States 16.03.2018
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Summary:We study second-harmonic generation from gold nanoislands covered with amorphous titanium oxide (TiO_{2}) films. As the TiO_{2} thickness increases, the plasmon resonance of the nanoislands shifts away from the second-harmonic wavelength of 532 nm, diminishing the resonant enhancement of the process at this wavelength. Nevertheless, the second-harmonic signal is enhanced by up to a factor of 45 with increasing TiO_{2} thickness. This unexpected effect arises from the scaling of local fields at the fundamental wavelength of 1064 nm-which is at the far tail of the resonance-due to a change in the dielectric environment of the nanoislands.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.113902