Linear dichroism and optical anisotropy of silver nanoprisms in polymer films

S. Requena, H. Doan, Sangram Limbaji Raut, A. D'Achille, Zygmunt Gryczynski, Ignacy Gryczynski, Y. M. Strzhemechny

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Abstract

We present optical studies of two different size distributions of silver triangular nanoprisms, one with a dipole resonance at 520 nm and the other with a dipole resonance at 650 nm, placed in different media. Significant wavelength-dependent depolarization of scattered light from the silver nanoprisms suspended in water indicates strong interference of multiple surface plasmon resonant modes in the same particle. We use this depolarization as a probe of light scattering by the nanoprisms in a lipid solution due to the rejection of a polarized background scattering. Also, the silver nanoprisms were embedded in a polyvinyl alcohol polymer matrix and oriented by stretching the polymer/nanoprism nanocomposite films. We observe significantly increased linear dichroism in the region associated with the plasmonic in-plane dipole mode upon stretching. Additionally, there is a weaker linear dichroism in the region associated with out-of-plane modes, which vanish in the extinction spectrum of the stretched nanocomposite film.

Original languageEnglish
Article number325704
JournalNanotechnology
Volume27
Issue number32
DOIs
StatePublished - 27 Jun 2016

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Keywords

  • PVA
  • anisotropy
  • nanocomposites
  • optical properties
  • plasmonics
  • silver nanoprisms

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