Sensitivity Improvement of Surface Plasmon Resonance Biosensors with GeS-Metal Layers

被引：16
|
作者：
Jia, Yue [1 ]
Liao, Yunlong [2 ]
Cai, Houzhi [1 ]
机构：
[1] Shenzhen Univ, Key Lab Optoelect Devices & Syst Guangdong Prov, Minist Educ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
[2] Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Tech, Minist Educ, Shenzhen 518060, Peoples R China
来源：
ELECTRONICS | 2022年 / 11卷 / 03期
基金：
中国国家自然科学基金;
关键词：
germanium sulfide; SPR; sensor; high sensitivity; SEMICONDUCTOR; PHOSPHORENE; SENSORS;
D O I：
10.3390/electronics11030332
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Surface plasmon resonance (SPR) biosensors, with germanium sulfide (GeS) as a sensitive medium and Al/Ag/Au as the metal layers, are reported as we aim to improve the sensitivities of the biosensors. The sensitivities in conventional SPR biosensors, consisting of only metal Al, Ag, and Au layers, are 111 degrees/RIU, 117 degrees/RIU, 139 degrees/RIU, respectively. Additionally, these sensitivities of the SPR biosensors based on the GeS-Al, GeS-Ag, and GeS-Au layers have an obvious improvement, resultant of 320 degrees/RIU, 295 degrees/RIU, and 260 degrees/RIU, respectively. We also discuss the changing sensing medium GeS thickness using layer number to describe the scenario which brought about the diversification on the figure of merit (FOM) and optical absorption (OA) performance of the biosensors. These biosensors show obvious improvement of sensitivity and have strong SPR excitation to analytes; we believe that these kind biosensors could find potential applications in biological detection, chemical examination, and medical diagnosis.
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页数：9
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