Abstract

A cost-effective simple technique to observe and analyze the surface plasmon resonance modulated radially sheared interference images using a birefringent lens (BL) is reported. Theoretical and experimental investigations have been presented for metallic thickness optimization, angle selection depending on the numerical aperture of BL, together with real and complex plane analysis of resonance parameters for better understanding of experimental results. Simultaneous observation of p- and s-polarizations using Wollaston prism also supports the modulation because of coupling of surface plasmons with p-polarization, whereas the unperturbed s-polarization can be used as reference. Moreover, we have also utilized this technique as the refractive index sensor for the analyte in contact with the plasmon generating metallic film.

© 2015 Optical Society of America

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