Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.113902
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Funding
- Academy of Finland [287651, 309473]
- Russian Ministry for Education and Science Project [3.2869.2017]
- Vilho, Yrjo, and Kalle Vaisala Foundation
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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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