Single-Band 2-nm-Line-Width Plasmon Resonance in a Strongly Coupled Au Nanorod

详细信息    查看全文

• 作者：Pan Wang ; Yipei Wang ; Zongyin Yang ; Xin Guo ; Xing Lin ; Xiao-Chong Yu ; Yun-Feng Xiao ; Wei Fang ; Lei Zhang ; Guowei Lu ; Qihuang Gong ; Limin Tong
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7581-7586
• 全文大小：418K
• ISSN：1530-6992

文摘

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 渭m, strong coupling between the nanorod and the cavity occurs, leading to evident mode splitting and spectral narrowing. Using a 1.46-渭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.