Optical properties of a metalo-dielectric nanocomposite: small gold spherical nanoparticles in a cylindrical di-block copolymer

Ali Askari (), Lale Rahimi, Ali Bahrampour and Giovanni Pepe

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 4, 1-8

Abstract: In this paper, the well-known effective medium approximation (EMA) and coupled dipole approximation (CDA) methods are employed to study the optical properties of a metal nanoparticle-block copolymer (MNP-BCP) nanocomposite. This approach is applied to study a system consisting of small gold spherical nanoparticles randomly distributed in the cylindrical micelles of a di-BCP. At first, the EMA method is used to obtain the effective dielectric function of a semi-metallic cylinder. Then, the extinction spectrum of the hexagonal 2D-array of semi-metallic cylinders is obtained by the CDA method. This procedure makes it possible to study simultaneously both the electromagnetic extinction of MNPs and incident light scattering from the 2D-array of polymeric cylinders. This work investigates the effect of different parameters such as filling fraction of MNPs, inter-cylinder distances, polarization and direction of the incident light and the difference between the refractive indices of the BCP blocks on the optical properties of the MNP-BCP nanocomposite system. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2013-31055-y

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