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
收藏
页码：1108 / 1116
页数：9
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