Chemically-doped graphene with improved surface plasmon characteristics: an optical near-field study

doi:10.1039/c6nr04239b

CORC > 金属研究所 > 中国科学院金属研究所

	Chemically-doped graphene with improved surface plasmon characteristics: an optical near-field study
	Zheng, Zebo 1,2; Wang, Weiliang 2; Ma, Teng 3; Deng, Zexiang 2; Ke, Yanlin 1,4; Zhan, Runze 1; Zou, Qionghui 1,2; Ren, Wencai 3; Chen, Jun 1,4; She, Juncong 1,4
刊名	NANOSCALE
	2016
卷号	8 期号:37 页码:16621-16630
ISSN号	2040-3364
DOI	10.1039/c6nr04239b
通讯作者	Chen, Huanjun(chenhj8@mail.sysu.edu.cn) ; Deng, Shaozhi(stsdsz@mail.sysu.edu.cn)
英文摘要	One of the most fascinating and important merits of graphene plasmonics is their tunability over a wide range. While chemical doping has proven to be a facile and effective way to create graphene plasmons, most of the previous studies focused on the macroscopic behaviors of the plasmons in chemically-doped graphene and little was known about their nanoscale responses and related mechanisms. Here, to the best of our knowledge, we present the first experimental near-field optical study on chemically-doped graphene with improved surface plasmon characteristics. By using a scattering-type scanning near-field optical microscope (s-SNOM), we managed to show that the graphene plasmons can be tuned and improved using a facile chemical doping method. Specifically, the plasmon interference patterns near the edge of the monolayer graphene were substantially enhanced via nitric acid (HNO3) exposure. The plasmon-related characteristics can be deduced by analyzing such plasmonic fringes, which exhibited a longer plasmon wavelength and reduced plasmon damping rate. In addition, the local carrier density and therefore the Fermi energy level (EF) of graphene can be obtained from the plasmonic nano-imaging, which indicated that the enhanced plasmon oscillation originated from the injection of free holes into graphene by HNO3. These findings were further corroborated by theoretical calculations using density functional theory (DFT). We believe that our findings provide a clear nanoscale picture on improving graphene plasmonics by chemical doping, which will be helpful for optimizing graphene plasmonics and for elucidating the mechanisms of two-dimensional light confinement by atomically thick materials.
资助项目	National Natural Science Foundation of China[51290271] ; National Natural Science Foundation of China[11474364] ; National Key Basic Research Program of China[2013CB933601] ; National Key Basic Research Program of China[2013YQ12034506] ; Guangdong Natural Science Funds for Distinguished Young Scholars[2014A030306017] ; Guangdong Special Support Program ; Fundamental Research Funds for the Central Universities
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000387857700006
资助机构	National Natural Science Foundation of China ; National Key Basic Research Program of China ; Guangdong Natural Science Funds for Distinguished Young Scholars ; Guangdong Special Support Program ; Fundamental Research Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/123193]
专题	金属研究所_中国科学院金属研究所
通讯作者	Chen, Huanjun; Deng, Shaozhi
作者单位	1.Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Guangdong Prov Key Lab Display Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China 2.Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 4.Sun Yat Sen Univ, Sch Elect & Informat Technol, Guangzhou 510006, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Zebo,Wang, Weiliang,Ma, Teng,et al. Chemically-doped graphene with improved surface plasmon characteristics: an optical near-field study[J]. NANOSCALE,2016,8(37):16621-16630.
APA	Zheng, Zebo.,Wang, Weiliang.,Ma, Teng.,Deng, Zexiang.,Ke, Yanlin.,...&Xu, Ningsheng.(2016).Chemically-doped graphene with improved surface plasmon characteristics: an optical near-field study.NANOSCALE,8(37),16621-16630.
MLA	Zheng, Zebo,et al."Chemically-doped graphene with improved surface plasmon characteristics: an optical near-field study".NANOSCALE 8.37(2016):16621-16630.