Journal
NANO LETTERS
Volume 10, Issue 10, Pages 4161-4165Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102450x
Keywords
Plasmonics; optical antennas; two-photon luminescence; nonlinear excitation; gold nanostructures
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Funding
- Karlsruhe School of Optics and Photonics (KSOP)
- Center for Functional Nanostructures (CFN)
- Deutsche Forschungsgemeinschaft (DFG) [DFG El 442/3-1, DFG El 442/2-2]
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We report on the two-photon excitation and subsequent plasmonic mode relaxation of coupled optical gold nanoantennas Using pulsed laser excitation at a constant wavelength of 810 nm, we observe two-photon-induced plasmon emission spectra, find them to match dark-field microscopy scattering spectra, and show that the emission intensity is enhanced by up to a factor of 65 compared to single gold rods of equal dimensions This study shows the link of nonlinear optical excitation schemes with radiative relaxation pathways that match plasmonic mode emission of resonant optical gold antennas
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