Optical response of gold-nanoparticle-amplified surface plasmon resonance spectroscopy

Yuichi Uchiho, Masayuki Shimojo, Kazuo Furuya, Kotaro Kajikawa

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A simple formalism that predicts optical constants of a two-dimensionally distributed nanoparticle (NP) thin film is presented for analysis of the NP-amplified surface plasmon resonance. The dielectric constant of the NP thin film can be evaluated with simple expressions at low coverages (σ<0.08), whereas the local fields induced by surrounding polarizations of NPs should be taken into account at coverages of σ> 0.08. Analytical and numerical calculations are carried out for evaluating the local fields at different conditions. The Clausius-Mossoti relation, which is usually used for evaluation of dielectric constants of a binary medium, does not hold in the NP thin films, because of the large interparticle distance and/or the retardation effect. We carried out SPR measurements for NP films with different NP coverages, and the results support the proposed analytical formalism. Finally we propose a procedure to evaluate the NP coverage from the NPSPR profile experimentally obtained.

Original languageEnglish
Pages (from-to)4816-4824
Number of pages9
JournalJournal of Physical Chemistry C
Volume114
Issue number11
DOIs
Publication statusPublished - 2010 Mar 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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