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Nanosized particles in thin metal composite films and in gratings: modeling of their optical response

P. SHARLANDJIEV1, D. NAZAROVA1,*

Affiliation

  1. Central Laboratory of Optical Storage and Processing of Information, Bulgarian Academy of Sciences, P.O.Box 95, Sofia PS-1113, Bulgaria

Abstract

Subwavelength diffraction gratings show enhanced optical transmission at certain wavelengths. These structures are intensively studied because of their potential for many novel applications. Recently, we have demonstrated by computer simulations that dielectric spheres randomly dispersed in metal host matrix have the same kind of resonant optical response. Herein, we present analysis of the extinction efficiency of a single dielectric sphere in Ag host matrix. Then, we examine the lower orders of the electric and magnetic modes, in order to find the poles that generate the morphology– dependent resonances. We also present analysis of the extinction efficiency of dielectric infinite circular cylinders in metal host matrix. Although the cylinders are randomly distributed in the metal film, their axes are assumed to be parallel to each other. Polarization effects are investigated and their dependence on the morphology of the dielectric particles is revealed. We discuss also the case when the dielectric cylinders are organized with certain periodicity in the metal film, thus forming a subwavelength diffraction grating. The features of the optical response of these structures strongly correlate..

Keywords

Metal nanosized composite films, Subwavelength diffraction gratings.

Submitted at: March 16, 2007
Accepted at: Aug. 18, 2007

Citation

P. SHARLANDJIEV, D. NAZAROVA, Nanosized particles in thin metal composite films and in gratings: modeling of their optical response, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 8, pp. 2462-2467 (2007)