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A Fabry-Pérot cavity coupled surface plasmon photodiode for electrical biomolecular sensing
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A Fabry-Pérot cavity coupled surface plasmon photodiode for electrical biomolecular sensing
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Journal Article
A Fabry-Pérot cavity coupled surface plasmon photodiode for electrical biomolecular sensing
2021
Overview
Surface plasmon resonance is a well-established technology for real-time highly sensitive label-free detection and measurement of binding kinetics between biological samples. A common drawback, however, of surface plasmon resonance detection is the necessity for far field angular resolved measurement of specular reflection, which increases the size as well as requiring precise calibration of the optical apparatus. Here we present an alternative optoelectronic approach in which the plasmonic sensor is integrated within a photovoltaic cell. Incident light generates an electronic signal that is sensitive to the refractive index of a solution via interaction with the plasmon. The photogenerated current is enhanced due to the coupling of the plasmon mode with Fabry-Pérot modes in the absorbing layer of the photovoltaic cell. The near field electrical detection of surface plasmon resonance we demonstrate will enable a next generation of cheap, compact and high throughput biosensors.
Surface plasmon resonance is well established for biosensing applications, but commonly limited by complex optical detection. Here, the authors present a plasmonic sensor integrated in a photovoltaic cell, which generates an electronic signal sensitive to the solution refractive index via plasmon interaction
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
