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Volume 11
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10.3390/electronics11030332
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Article

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

by
Yue Jia
1,
Yunlong Liao
2 and
Houzhi Cai
1,*
1
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2
International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technoloy of Ministry of Education, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
Electronics 2022, 11(3), 332; https://doi.org/10.3390/electronics11030332
Submission received: 1 December 2021 / Revised: 6 January 2022 / Accepted: 19 January 2022 / Published: 21 January 2022
(This article belongs to the Special Issue Digital and Optical Security Algorithms via Machine Learning)
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Abstract

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°/RIU, 117°/RIU, 139°/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°/RIU, 295°/RIU, and 260°/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.
Keywords: germanium sulfide; SPR; sensor; high sensitivity germanium sulfide; SPR; sensor; high sensitivity

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MDPI and ACS Style

Jia, Y.; Liao, Y.; Cai, H. Sensitivity Improvement of Surface Plasmon Resonance Biosensors with GeS-Metal Layers. Electronics 2022, 11, 332. https://doi.org/10.3390/electronics11030332

AMA Style

Jia Y, Liao Y, Cai H. Sensitivity Improvement of Surface Plasmon Resonance Biosensors with GeS-Metal Layers. Electronics. 2022; 11(3):332. https://doi.org/10.3390/electronics11030332

Chicago/Turabian Style

Jia, Yue, Yunlong Liao, and Houzhi Cai. 2022. "Sensitivity Improvement of Surface Plasmon Resonance Biosensors with GeS-Metal Layers" Electronics 11, no. 3: 332. https://doi.org/10.3390/electronics11030332

APA Style

Jia, Y., Liao, Y., & Cai, H. (2022). Sensitivity Improvement of Surface Plasmon Resonance Biosensors with GeS-Metal Layers. Electronics, 11(3), 332. https://doi.org/10.3390/electronics11030332

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