A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer

doi:10.1088/1674-1056/28/4/044201

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	A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer
	Wang, Xiangxian1 ; Zhu, Jiankai 1; Tong, Huan 1; Yang, Xudong 1; Wu, Xiaoxiong 1; Pang, Zhiyuan 1; Yang, Hua1 ; Qi, Yunping 2
	2019-04
发表期刊	CHINESE PHYSICS B
ISSN	1674-1056
卷号	28 期号:4
摘要	A plasmonic refractive index (RI) sensor with high RI sensitivity based on a gold composite structure is proposed. This composite structure is constructed from a perfect gold nano-disk square array on a gold film, with a SiO2 spacer. The reflection spectra of the composite structure, with analyte RI in the range of 1.30 to 1.40, are theoretically studied using the finite-difference time-domain method. The incident light beam is partly coupled to the localized surface plasmons (LSP) of the single nano-disks and partly transferred to the propagating surface plasmons (PSP) by grating coupling. The reflectivity is nearly zero at the valley of the reflection spectrum because of the strong coupling between LSP and PSP. Also, the full width at half maximum (FWHM) of one of the surface plasmon polaritons (SPPs) modes is very narrow, which is helpful for RI sensing. An RI sensitivity as high as 853 nm/RIU is obtained. The influence of the structure parameters on the RI sensitivity and the sensor figure of merit (FOM) are investigated in detail. We find that the sensor maintains high RI sensitivity over a large range of periods and nano-disk diameters. Results of the theoretical simulation of the composite structure as a plasmonic sensor are promising. Thus, this composite structure could be extensively applied in the fields of biology and chemistry.
关键词	Plasmonic sensor refractive index sensitivity FOM
DOI	10.1088/1674-1056/28/4/044201
收录类别	SCI ; SCIE
语种	英语
资助项目	Undergraduate Innovation Training Program of Lanzhou University of Technology[DC2018004]
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000464051900001
出版者	IOP PUBLISHING LTD
EI入藏号	20191806866594
EI主题词	Surface plasmons
EI分类号	547.1 Precious Metals - 601.2 Machine Components - 711 Electromagnetic Waves - 712.1 Semiconducting Materials - 741.1 Light/Optics - 761 Nanotechnology - 801.4 Physical Chemistry - 921 Mathematics - 933 Solid State Physics - 951 Materials Science
引用统计	被引频次：118[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/31988
专题	理学院
通讯作者	Wang, Xiangxian
作者单位	1.Lanzhou Univ Technol, Sch Sci, Lanzhou 730050, Gansu, Peoples R China; 2.Northwest Normal Univ, Coll Phys & Elect Engn, Lanzhou 730070, Gansu, Peoples R China
第一作者单位	理学院
通讯作者单位	理学院
第一作者的第一单位	理学院
推荐引用方式 GB/T 7714	Wang, Xiangxian,Zhu, Jiankai,Tong, Huan,et al. A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer[J]. CHINESE PHYSICS B,2019,28(4).
APA	Wang, Xiangxian.,Zhu, Jiankai.,Tong, Huan.,Yang, Xudong.,Wu, Xiaoxiong.,...&Qi, Yunping.(2019).A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer.CHINESE PHYSICS B,28(4).
MLA	Wang, Xiangxian,et al."A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO2 spacer".CHINESE PHYSICS B 28.4(2019).