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

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  • Ali Askari
  • Lale Rahimi
  • Ali Bahrampour
  • Giovanni Pepe

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

Suggested Citation

  • Ali Askari & Lale Rahimi & Ali Bahrampour & Giovanni Pepe, 2013. "Optical properties of a metalo-dielectric nanocomposite: small gold spherical nanoparticles in a cylindrical di-block copolymer," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(4), pages 1-8, April.
    • Handle: RePEc:spr:eurphb:v:86:y:2013:i:4:p:1-8:10.1140/epjb/e2013-31055-y
    DOI: 10.1140/epjb/e2013-31055-y
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    Solid State and Materials;

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