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.
Highlights
Sensing has been considered one of the most promising applications in plasma [1,2] and photonic [3] technology
To improve the sensitivity of the sensor, we developed an surface plasmon resonance (SPR) biochemical sensor using germanium monosulfide (GeS) material
We put the addition of the GeS material on the surface of metallic Al/Ag/Au layer, and the detection target flow past the 2D material surface in the structure, using this way to increase the sensitivity of the biosensors
Summary
Sensing has been considered one of the most promising applications in plasma [1,2] and photonic [3] technology. The sensitivities, expressed as SR1 = ∆θ/∆n, cause the refractive index of the sensing medium (∆n) to change, leading to the shift in the resonance angle (∆θ) [33].
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