Abstract
A design method for a SPR (surface plasmon resonance) sensor based on a D-type plastic optical fiber (POF) geometry in a configuration of a multi-layered scheme is proposed in this paper. The numerical simulation for the optimal sensitivity with spectral interogation was performed in order to choose the practical implementation geometry of the SPR sensor. A side-polish to the half of the fiber's PMMA core, with about 10mm in length is made and a Microposit 1813 buffer and gold layer deposition is used for sample fabrication. The effect of different thickness of the layers in different multi-layered configuration has been investigated. The proposed setup for sensor test, measures the light intensity instead of phase difference. It can be used for refractive index changes (1.33-1.40) in real time detection of the substances for different biosensing applications. The proposed sensor is simple to use, has small size, it works on small analyt-sample size and it is cost effective for specific non-invasive application users.
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