d 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.</p>
<p>Here we model the optical properties of such a system, starting with the angular variation of the reflectivity.</p>
<div id="reflectivity-against-internal-incident-angle-for-the-kretschmann-configu