"Small-particle limit" the second harmonic generation from noble metal nanoparticles

Chandra, Manabendra and Das, Puspendu K (2009) "Small-particle limit" the second harmonic generation from noble metal nanoparticles. In: Chemical Physics, 358 (3). pp. 203-208.

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Abstract

In this paper, we have probed the origin of SHG in copper nanoparticles by polarization-resolved hyper-Rayleigh scattering (HRS). Results obtained with various sizes of copper nanoparticles at four different wavelengths covering the wavelength range 738-1907 nm reveal that the origin of second harmonic generation (SHG) in these particles is purely dipolar in nature as long as the size (d) of the particles remains smaller compared to the wavelength (;.) of light ("small-particle limit"). However, contribution of the higher order multipoles coupled with retardation effect becomes apparent with an increase in the d/lambda ratio. We have identified the "small-particle limit" in the second harmonic generation from noble metal nanoparticles by evaluating the critical d/lambda ratio at which the retardation effect sets in the noble metal nanoparticles. We have found that the second-order nonlinear optical property of copper nanoparticles closely resembles that of gold, but not that of silver. (C) 2009 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Chemical Physics
Publisher:	Elsevier Science
Additional Information:	Copyrigth of this article belongs to Elsevier Science.
Keywords:	Polarization-resolved hyper-Rayleigh scattering;Multipolar second harmonic generation;Noble metal nanoparticles;Polar plots;Small-particle limit
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	03 Jan 2010 11:00
Last Modified:	19 Sep 2010 05:32
URI:	http://eprints.iisc.ac.in/id/eprint/20435

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