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Tuning of gold nanoparticles plasmon resonances by experiment and simulation

F. TODERAS1, M. BAIA1, V. FARCAU1,* , S. ASTILEAN1, S. ULINICI2

Affiliation

  1. Nanobiophotonics Laboratory, Institute for Interdisciplinary Experimental Research, Babes-Bolyai University, Treboniu Laurian 42, 400271, Cluj-Napoca, Romania
  2. ICPE Bistrita SA, Parcului 7, 420035, Bistrita, Romania

Abstract

We demonstrate, both experimentally and theoretically, the tunability of surface plasmon resonances of gold nanoparticles as function of their size and shape (spheres, rods). Transmission electron microscopy and UV-VIS absorption were employed for experimental characterization. The discrete dipole approximation (DDA), in which the nanoparticle is discretized into a cubic array of polarizable elements, with each element representing the polarizability of a discrete volume of material, is used for simulation of surface plasmon resonances. From simulated and experimental spectra, it is clearly deduced that changes in size and shape of nanoparticle as well as in their local environment can introduce marked changes in their optical properties. The comparison with experiments shows that classical electromagnetic theory works well, provided that we have size distribution values of particle dimensions and provided that the dielectric environment is properly characterized and modeled..

Keywords

Gold nanoparticles, Surface plasmons, DDA.

Submitted at: Nov. 1, 2008
Accepted at: Dec. 10, 2008

Citation

F. TODERAS, M. BAIA, V. FARCAU, S. ASTILEAN, S. ULINICI, Tuning of gold nanoparticles plasmon resonances by experiment and simulation, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3265-3269 (2008)