[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
National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
Konan University, 8-9-1 Okamoto, Higashinada-ku, Kobe 658-8501, Japan
Waseda University, 3-4-1 Okubo, Shinjyuku, Tokyo 169-8555, Japan
Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
Institute for Molecular Science, 38 Myodaiji, Okazaki 444-8585, Japan
(Received 7 December 2009 / Accepted 25 February 2010 / Published 10 December 2010)


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.


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

DOI: 10.1585/pfr.5.S2110


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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).