[Table of Contents]

Plasma and Fusion Research

Volume 5, S2110 (2010)

Regular Articles

FDTD Simulated Observation of a Gold Nanorod by Scanning Near-Field Optical Microscopy
Keiji SAWADA, Hiroaki NAKAMURA1), Teruto MARUOKA, Yuichi TAMURA2), Kohei IMURA3), Toshiharu SAIKI4) and Hiromi OKAMOTO5)
Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
1)
National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
2)
Konan University, 8-9-1 Okamoto, Higashinada-ku, Kobe 658-8501, Japan
3)
Waseda University, 3-4-1 Okubo, Shinjyuku, Tokyo 169-8555, Japan
4)
Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
5)
Institute for Molecular Science, 38 Myodaiji, Okazaki 444-8585, Japan
(Received 7 December 2009 / Accepted 25 February 2010 / Published 10 December 2010)

Abstract

The optical properties of a gold nanorod were investigated by Imura et al. [J. Chem. Phys. 122, 154701 (2005)] using an apertured-type scanning near-field optical microscope (SNOM). The observed transmission image showed an oscillating pattern along the long axis of the nanorod. We obtain the image using the finite-difference time-domain (FDTD) method. Our model includes a nanorod on a glass substrate, a SNOM, and current as a light source. We develop a simple method for including the Drude-Lorentz dispersion relation of Vial et al. [Phys. Rev. B 71, 085416 (2005)] for gold in the FDTD. The oscillating pattern is explained by the total current in the nanorod, tip of the SNOM, and light source.

Keywords

FDTD, SNOM, gold nanorod, plasmon, Drude-Lorentz model

DOI: 10.1585/pfr.5.S2110

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References

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This paper may be cited as follows:

Keiji SAWADA, Hiroaki NAKAMURA, Teruto MARUOKA, Yuichi TAMURA, Kohei IMURA, Toshiharu SAIKI and Hiromi OKAMOTO, Plasma Fusion Res. 5, S2110 (2010).