Analytical Approach to the Prism Coupling Problem in the Kretschmann Configuration |
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Authors: | Z D Genchev N M Nedelchev E Mateev H Y Stoyanov |
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Institution: | (1) Institute of Electronics “E. Djakov”, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria;(2) Faculty of Physics, Sofia University “St. Kliment Ohridski”, 1164 Sofia, Bulgaria |
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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 (λ = 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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Keywords: | Surface plasmon resonance Reflection Optical constants of metals |
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