Abstract
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.
| Original language | English |
|---|---|
| Article number | 154701 |
| Journal | Journal of Chemical Physics |
| Volume | 122 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 2005 Apr 15 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Near-field optical imaging of plasmon modes in gold nanorods. / Imura, Kohei; Nagahara, Tetsuhiko; Okamoto, Hiromi.
In: Journal of Chemical Physics, Vol. 122, No. 15, 154701, 15.04.2005.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Near-field optical imaging of plasmon modes in gold nanorods
AU - Imura, Kohei
AU - Nagahara, Tetsuhiko
AU - Okamoto, Hiromi
PY - 2005/4/15
Y1 - 2005/4/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=20844457729&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=20844457729&partnerID=8YFLogxK
U2 - 10.1063/1.1873692
DO - 10.1063/1.1873692
M3 - Article
VL - 122
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 15
M1 - 154701
ER -