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J Am Chem Soc. 2005 Sep 14;127(36):12482-3.

Correlating second harmonic optical responses of single Ag nanoparticles with morphology.

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Department of Chemistry, James Franck Institute, and Consortium for Nanoscience Research, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA.


Femtosecond laser excited second harmonic (SH) activity from single Ag nanoparticles is reported. A correlation of SH single-particle measurements with high-resolution imaging of particle morphology by TEM was achieved by creating position markers on an optical and electron transparent substrate (Si3N4 thin film, approximately 100 nm). We compared the SH activity of single Ag nanoparticles (nanospheres versus nanorods) and cluster structures (composed of two or multiple particles, e.g., dimers and trimers). The direct correlation of single-particle structures and SH activity, spectral and power dependence, strongly suggests one-photon resonant driven nonlinear oscillator response mechanism.

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