High performance SPR biosensor using Cu-Pt bimetallic layers and 2D materials

Abstract

In this present paper, we propose a surface plasmon resonance(SPR)sensor having better performance parameters based on Kretschmann configuration. The proposed SPR sensor is a modified Kretschmann configuration comprised of BK7 prism-Cu-Pt-Graphene/BP/WS2. The bimetallic layer provides consistent enhancement of sensitivity over other SPR structures. Extensive numerical analysis based on transfer matrix theory has been performed to characterize the sensor response considering sensitivity, full width at half maxima (FWHM), detection accuracy(DA), quality factor(QF) with other conventional reported SPR sensor. We have also analyzed the electric field intensity enhancement factor(EFIEF) for the proposed SPR sensor. We have found that maximum sensitivity of 309deg/RIU corresponds to the four layer of BP configuration. We believe that this proposed SPR sensor could find the new platform for the chemical examination, medical diagnosis, gas detection and biological detection.

Influence of the configuration of metal sensing layers on the performance of a bimetallic (Ag–Cu) surface plasmon resonance biosensor

“…The benefits of Ag-Au combinations include a high signal-to-noise ratio [3,4], narrowing of the attenuated total reflectance (ATR) resonance curve [5], improved detection sensitivity and accuracy [6], reduced angular width of the signal [5,7,8], and improved linearity [9,10]. While silver and gold continue to be the main metals used in single-metal and bimetallic configurations, other metals like aluminum [11], and copper [12] have been explored for their individual plasmonic properties and potential synergies. In recent years, many authors have explored theoretical bimetallic configurations with Ag, yielding promising outcomes.…”