抄録
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.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 4816-4824 |
| ページ数 | 9 |
| ジャーナル | Journal of Physical Chemistry C |
| 巻 | 114 |
| 号 | 11 |
| DOI | |
| 出版ステータス | Published - 2010 3月 25 |
| 外部発表 | はい |
ASJC Scopus subject areas
- 電子材料、光学材料、および磁性材料
- エネルギー（全般）
- 物理化学および理論化学
- 表面、皮膜および薄膜