Near-field optical imaging of plasmon modes in gold nanorods

被引：135
|
作者：
Imura, K [1 ]
Nagahara, T
Okamoto, H
机构：
[1] Inst Mol Sci, Okazaki, Aichi 4448585, Japan
[2] Grad Univ Adv Studies, Okazaki, Aichi 4448585, Japan
来源：
JOURNAL OF CHEMICAL PHYSICS | 2005年 / 122卷 / 15期
基金：
日本学术振兴会;
关键词：
D O I：
10.1063/1.1873692
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We have investigated optical properties of single gold nanorods by using an apertured-type scanning near-field optical microscope. Near-field transmission spectrum of single gold nanorod shows several longitudinal surface plasmon resonances. Transmission images observed at these resonance wavelengths show oscillating pattern along the long axis of the nanorod. The number of oscillation increases with decrement of observing wavelength. These spatial characteristics were well reproduced by calculated local density-of-states maps and were attributed to spatial characteristics of plasmon modes inside the nanorods. Dispersion relation for plasmons in gold nanorods was obtained by plotting the resonance frequencies of the plasmon modes versus the wave vectors obtained from the transmission images. (c) 2005 American Institute of Physics.
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页数：5
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