Polyhedron Biosensor Based on the Surface Plasmon Resonance Technology in Heterodyne Interferometry

In this article, a polyhedron biosensor based on the surface plasmon resonance technology in heterodyne interferometry is proposed. The sensor is designed as the polygon prism that is made of BK-7 glass with the refractive index of 1.51509. As a heterodyne optical source is launched into the biosensor, the phase difference between s-and p-polarization components can be obtained. The related parameters of the tested medium can be achieved after some calculations. The best resolution of the sensor can reach 5.5×10-7 refractive index unit (RIU). The polyhedron biosensor has some merits, e.g., a simple optical setup, easy operation, high measurement accuracy, high resolution, high sensitivity, and in real-time test, etc.