FDTD Simulated Observation of a Gold Nanorod by Scanning Near-Field Optical Microscopy
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概要
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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.
著者
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Saiki Toshiharu
Keio Univ. Yokohama Jpn
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Nakamura Hiroaki
National Inst. Fusion Sci. Toki Jpn
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Okamoto Hiromi
Institute For Molecular Science
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TAMURA Yuichi
Konan University, 8-9-1 Okamoto, Higashinada, Kobe 658-8501, Japan
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SAWADA Keiji
Shinshu University
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SAWADA Keiji
Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
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MARUOKA Teruto
Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
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IMURA Kohei
Waseda University, 3-4-1 Okubo, Shinjyuku, Tokyo 169-8555, Japan
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