Near-field optical imaging of plasmon modes in gold nanorods

Kohei Imura; Tetsuhiko Nagahara; Hiromi Okamoto

doi:10.1063/1.1873692

Near-field optical imaging of plasmon modes in gold nanorods

Kohei Imura, Tetsuhiko Nagahara, Hiromi Okamoto

Research output: Contribution to journal › Article › peer-review

138 Citations (Scopus)

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	https://doi.org/10.1063/1.1873692
Publication status	Published - 2005 Apr 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1063/1.1873692

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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.",

author = "Kohei Imura and Tetsuhiko Nagahara and Hiromi Okamoto",

note = "Funding Information: The work described herein was supported by Grants-in-Aid for Scientific Research (Grant Nos. 16350015 and 16750017) from Japan Society for the Promotion of Science. The authors thank Equipment Development Center of IMS for collaboration in construction of the SNOM apparatus. ",

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AU - Imura, Kohei

AU - Nagahara, Tetsuhiko

AU - Okamoto, Hiromi

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PY - 2005/4/15

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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.

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Near-field optical imaging of plasmon modes in gold nanorods

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