We study spectral responses of localized surface plasmons (LSPs) in gold nanorods, which resonate at mid-infrared frequencies, by transmission spectroscopy and electromagnetic field analyses. The resonance linewidth is found to be linearly proportional to the resonance frequency, indicating that the dephasing due to Drude relaxation is suppressed and that the overall dephasing is dominated by radiative damping. Owing to the reduced radiative/non-radiative damping and large geometrical length of the nanorod, near-field intensity enhancement exceeds several hundred times. Nonetheless the resonance linewidth is comparable with or larger than the bandwidth of a 100-fs pulse, and therefore the enhanced near-field as short as 100-fs can be created upon pulsed excitation. The large enhancements with appropriate bandwidths make LSPs promising for enhanced nonlinear spectroscopies, coherent controls, and strong-field light-matter interactions in the mid-infrared range.
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21 October 2014
Research Article|
October 15 2014
Spectral response of localized surface plasmon in resonance with mid-infrared light
Fumiya Kusa;
Fumiya Kusa
1Department of Applied Physics,
Tokyo University of Agriculture and Technology
, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
2Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Satoshi Ashihara
Satoshi Ashihara
a)
2Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Appl. Phys. 116, 153103 (2014)
Article history
Received:
June 17 2014
Accepted:
October 05 2014
Citation
Fumiya Kusa, Satoshi Ashihara; Spectral response of localized surface plasmon in resonance with mid-infrared light. J. Appl. Phys. 21 October 2014; 116 (15): 153103. https://doi.org/10.1063/1.4898316
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