期刊
NANO LETTERS
卷 15, 期 11, 页码 7581-7586出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03330
关键词
Localized surface plasmon resonance; line width; whispering gallery modes; strong coupling; microfibers; Au nanorods
类别
资金
- National Basic Research Program of China [2013CB328703]
- National Natural Science Foundation of China [61475136, 61036012]
- Fundamental Research Funds for the Central Universities
This paper reports a dramatic reduction in plasmon resonance line width of a single Au nanorod by coupling it to a whispering gallery cavity of a silica microfiber. With fiber diameter below 6 mu m, strong coupling between the nanorod and the cavity occurs, leading to evident mode splitting and spectral narrowing. Using a 1.46-mu m-diameter microfiber, we obtained single band 2-nm-line-width plasmon resonance in an Au nanorod around a 655-nm-wavelength, with a quality factor up to 330 and extinction ratio of 30 dB. Compared to an uncoupled Au nanorod, the strongly coupled nanorod offers a 30-fold enhancement in the peak intensity of plasmonic resonant scattering.
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