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Proceedings Paper

Dependence of the optical properties of metal nanoparticles on the external dielectric medium: effects of the particle size, shape, and structure
Author(s): Lyubov A. Trachuk; Andrei G. Melnikov; Nikolai G. Khlebtsov
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Paper Abstract

The influence of the size, shape and structure of gold and silver nanoparticles on the dielectric environment dependence of their extinction and integral scattering spectra has been studied. Calculations were carried out for spheres and nanoshells (Mie theory), randomly oriented bispheres, spheroids and s-cylinders with hemispherical ends (T-matrix method). The sensitivity of plasmon resonance (PR) turning to variations of the refractive index was studied (n = 1.3 - 1.7) for the particles with different equivolume size. In the case of nanoshells, the metal layer thickness was also varied. For nanoparticles with equivolume diameter 15 nm, the maximal PR shifts is observed in case of bispheres and decreases in the order: nanoshells, s-cylinders (spheroids), spheres. For the particles with diameter 60 nm, the maximal PR shifts is observed in case of nanoshells and decreases in the order: bispheres, s-cylinders (spheroids), spheres. Other things being equal, the PR of silver nanoparticles is more sensitive to the dielectric surroundings as compared to the gold counterparts.

Paper Details

Date Published: 17 March 2005
PDF: 11 pages
Proc. SPIE 5829, 13th International Workshop on Lidar Multiple Scattering Experiments, (17 March 2005); doi: 10.1117/12.617329
Show Author Affiliations
Lyubov A. Trachuk, Institute of Biochemistry and Physiology of Plants and Microorganisms (Russia)
Andrei G. Melnikov, Institute of Biochemistry and Physiology of Plants and Microorganisms (Russia)
Nikolai G. Khlebtsov, Institute of Biochemistry and Physiology of Plants and Microorganisms (Russia)
Saratov Univ. (Russia)


Published in SPIE Proceedings Vol. 5829:
13th International Workshop on Lidar Multiple Scattering Experiments
Anatoli G. Borovoi, Editor(s)

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