Journal
NANO LETTERS
Volume 11, Issue 11, Pages 4674-4678Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202255g
Keywords
Gold; aluminum; nanoantennas; two-photon photoluminescence; nonlinear plasmonics; resonance-controlled polarization
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Funding
- MICINN [FIS2009-08203, CONSOLIDER CSD2007-046]
- RyC
- Fundacio CELLEX
- EU ERC [247330]
- European Research Council (ERC) [247330] Funding Source: European Research Council (ERC)
- ICREA Funding Source: Custom
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Resonant optical antennas are ideal for nanoscale nonlinear optical interactions due to their inherent strong local field enhancement. Indeed second- and third-order nonlinear response of gold nanoparticles has been reported. Here we compare the on- and off-resonance properties of aluminum, silver, and gold nanoantennas, by measuring two-photon photoluminescence. Remarkably, aluminum shows 2 orders of magnitude higher luminescence efficiency than silver or gold. Moreover, in striking contrast to gold, the aluminum emission largely preserves the linear incident polarization. Finally, we show the systematic resonance control of two-photon excitation and luminescence polarization by tuning the antenna width and length independently. Our findings point to aluminum as a promising metal for nonlinear plasmonics.
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