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Nano Lett. 2005 Apr;5(4):799-802.

Third-harmonic generation from single gold nanoparticles.

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  • 1MoNOS, Huygens Laboratory, Universiteit Leiden, P.O. Box 9504, 2300 RA Leiden, The Netherlands.


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.

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