Abstract
A new type of surface plasmon resonance biosensor based on inverted graded index optical fiber is presented. To allow the exciting of the surface plasmons, the cladding is removed and a thin film of gold is coated on the inverted graded index core at this region. This sensor can measure the refractive index (RI) of biomaterials in the range of 1.36–1.48. The simulation results show that the proposed biosensor has a maximum sensitivity of about 7000 nm/RI unit (RIU) and the average figure of merit is 48 RIU−1. The simplicity of the design and its high sensitivity make it a good candidate for low-cost RI sensors suitable for biomaterials.
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