Analytical Approach to the Prism Coupling Problem in the Kretschmann Configuration

Abstract

Prism coupling in the Kretschmann configuration is a well-known method for excitation of surface plasmon polaritons (SPP's) in a metal film bounded from one side by a prism and from the other side by air. The analysis of the reflectance in the upper medium (prism) is based on the well-known Fresnel's formula. Due to the fact that this formula cannot be inverted directly to give the complex dielectric permittivity and the thickness of the metal film from measured values of the reflectance at three or more different angles of incidence, an additional analysis is needed. Here, such an analysis is presented. The special case of illumination with He-Ne laser (l=632.8 nm) of silver film bounded by air is considered. A new asymptotic formula for the Lorentz dip is derived. Our experimental data for silver film are reported too.

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“…66 The KCs, as mentioned above, show the drawback of fine-tuning the illumination of incident light and has a problem with precise detecting of SPR angle in an SPR-based biosensor. In addition, they have difficulty realizing IOCs highly due to the additional KC with the adhesion of prism on the substrate (i.e., a metal film bounded from one side by a prism and from the other side by air 67 ). This work proposed a simple periodic structure including a closed loop and a linked interface for the near-unity absorption of dual-band EM waves in visible and NIR lights.…”

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