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Khalili Dezaji H, Roshan Entezar S, Rashidi A. The Effect of a Thin metal Layer on the Sensitivity of Refractive Index Measurement by Methods Based on the Total Internal Reflection. ICOP & ICPET _ INPC _ ICOFS 2015; 21 :549-552
URL: http://opsi.ir/article-1-683-en.html
URL: http://opsi.ir/article-1-683-en.html
1- Tabriz University-Faculty of Physics
Abstract: (3611 Views)
In this paper, the sensitivity of refractive index measurement using prisms with the metal coating in the phase sensitive optical sensors which operate based on the total internal reflection, has been investigated. It has been shown that the variations of phase difference between two p-polarized and s-polarized reflected waves with the refractive index of the test material in the case of the prism with a metal coating is higher than that of the non-metallic coating. This is due to the excitation of surface plasmons at the interface between the test material and the thin metal layer. Since, one can obtain the refractive index of a test material by measuring this phase difference with the phase-shifting interferometer, the refractive index measurement using the prisms with metal coating has higher sensitivity.
Keywords: Surface Plasmons, Prism, Thin metal layer, Sensitivity Of Refractive Index Measurement, Total Internal Reflection
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