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knitr::read_demo("kretschmann_reflectivity", package="planar")
The Kretschmann configuration consists of a thin metal film, typically 50nm of gold or silver, deposited on top of a high-index prism (n=1.5 for glass). Light incident from the prism side undergoes total internal reflection (TIR) above ~45 degrees (internal angle). The evanescent field associated with TIR penetrates the metal and may couple to surface plasmon-polaritons supported at the air/metal interface.
Here we model the optical properties of such a system, starting with the angular variation of the reflectivity.
We now look at the effect of changing the thickness of the metal layer, from non-existent (single air/glass interface), to an opaque metal film. First, we wrap the calculation in a function, and loop over this function with a vector of film thicknesses.
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