Third-Harmonic Generation from Single Gold Nanoparticles
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- 4 March 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (4) , 799-802
- https://doi.org/10.1021/nl0502571
Abstract
We report the first observation of third-harmonic signals from individual gold colloids down to 40 nm diameter. Excited with 1-ps pulses at 1500 nm, the colloids generate 500-nm light, close to the plasmon resonance. The third-harmonic intensity varies as the square of the colloid surface area. Although weak, the third-harmonic signals of gold labels as small as 15 nm in diameter are expected to be accessible with 100-fs pulses. They could be used in microscopy for single-biomolecule tracking.Keywords
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