Sensitivity enhancement of a graphene-barium titanate-based surface plasmon resonance biosensor with an Ag-Au bimetallic structure in the visible region

被引：42

作者：

Liu, Lili ^{[1
,2
]}

Wang, Mei ^{[1
,2
]}

Jiao, Lipeng ^{[1
,2
]}

Wu, Ting ^{[1
,2
]}

Xia, Feng ^{[1
,2
]}

Liu, Meijie ^{[1
,2
]}

Kong, Weijin ^{[1
,2
]}

Dong, Lifeng ^{[3
,4
]}

Yun, Maojin ^{[1
,2
]}

机构：

[1] Qingdao Univ, Coll Phys Sci, Qingdao 266071, Shandong, Peoples R China

[2] Qingdao Univ, Key Lab Photon Mat & Technol Univ Shandong, Qingdao 266071, Shandong, Peoples R China

[3] Taishan Med Univ, Sch Chem & Pharmaceut Engn, Tai An 271016, Shandong, Peoples R China

[4] Hemline Univ, Dept Phys, St Paul, MN 55104 USA

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2019年 / 36卷 / 04期

基金：

中国国家自然科学基金;

关键词：

FIELD ENHANCEMENT; SPR BIOSENSOR; PERFORMANCE; SILVER; SENSOR; LAYER;

D O I：

10.1364/JOSAB.36.001108

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this study, a surface plasmon resonance (SPR) biosensor based on graphene-barium titanate nanocomposites is optimized by using an Ag-Au bimetallic configuration to achieve sensitivity enhancement. The angular interrogation method is used for the analysis of the reflectance from the sensor. By optimizing parameters, a sensitivity and figure of merit as high as 294 degrees/RIU and 42.13 1/RIU can be obtained with Ag-Au bimetallic film at a wavelength of 633 nm. Compared with conventional SPR biosensors with a single metal film, the sensitivity of the proposed biosensor with Ag-Au bimetallic film can be greatly enhanced. Also, Au thin film can be used as a protective layer to prevent oxidation of the Ag layer. (C) 2019 Optical Society of America

引用

页码：1108 / 1116

页数：9

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