Gated Tunability and Hybridization of Localized Plasmons in Nanostructured Graphene
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- 作者：Zheyu Fang ; Sukosin Thongrattanasiri ; Andrea Schlather ; Zheng Liu ; Lulu Ma ; Yumin Wang ; Pulickel M. Ajayan ; Peter Nordlander ; Naomi J. Halas ; F. Javier Garc铆a de Abajo
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：March 26, 2013
- 年：2013
- 卷：7
- 期：3
- 页码：2388-2395
- 全文大小：559K
- 年卷期：v.7,no.3(March 26, 2013)
- ISSN：1936-086X
文摘
Graphene has emerged as an outstanding material for optoelectronic applications due to its high electronic mobility and unique doping capabilities. Here we demonstrate electrical tunability and hybridization of plasmons in graphene nanodisks and nanorings down to 3.7 渭m light wavelength. By electrically doping patterned graphene arrays with an applied gate voltage, we observe radical changes in the plasmon energy and strength, in excellent quantitative agreement with rigorous analytical theory. We further show evidence of an unexpected increase in plasmon lifetime with growing energy. Plasmon hybridization and electrical doping in nanorings of suitably chosen nanoscale dimensions are key elements for bringing the optical response of graphene closer to the near-infrared, where it can provide a robust, integrable platform for light modulation, switching, and sensing.