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TUTCRIS

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

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Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli113902
JulkaisuPhysical Review Letters
Vuosikerta120
Numero11
DOI - pysyväislinkit
TilaJulkaistu - 15 maaliskuuta 2018
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

Tiivistelmä

We study second-harmonic generation from gold nanoislands covered with amorphous titanium oxide (TiO2) films. As the TiO2 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 TiO2 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.

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