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Feedback Re: how to define optical surface properties of interface between non-metal and metal? 作者: Y 

Forum: Processes Involving Optical Photons
Date: 23 Feb, 2006
From: Gumplinger Peter <Gumplinger Peter>

Let me point out again that you do NOT have to specify a G4OpticalSurface if the surface you want to model is perfectly polished and of type dielectric_dielectric. Conversely, if you have an interface between two dielectric media and you haven't done anything except attached a G4MaterialPropertiesTable with the index of refraction to each of the volumes on either side of the interface, optical photons will see that surface as polished and as a dielectric_dielectric interface governed by Snell's Law, Law of Reflection and the Fresnel Equations.

In your case, you did not have to specify 'OpScintSurface' although there is certainly nothing wrong with doing so.

I must assume that you position the 'cath_log' volume so that there is a thin gap between it and the 'scint_log' volume. Both scint_log and cath_log are positioned inside some larger volume (housing) and the gap is then made up of the material of the 'housing'. If that material has an index of refraction, the photons crossing the gap will first encounter the (default) dielectric_dielectric polished interface between scintillator and 'housing' and then across the gap encounter the dielectric_metal skin of the cathode.

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