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Forum: Processes Involving Optical Photons
Re: Question How to define one single surface of a solid differently (Susanne Jungmann)
Date: 15 Dec, 2010
From: Gumplinger Peter <Gumplinger Peter>

Susanne,

> As I already understood by not
> defining any LogicalBorderSurface, a polished, dielectric-dielectric
> border is assumed by default! Should then not reflection happen at this
> point?

Only internal reflection happens according to Snell's Law on a polished dielectric-dielectric surface, else the photon refracts out. Of course, you need to give your volume 3's material an index of refraction for Snell's Law to be evaluated.

> But what I would like to have is internal reflection at one
> single polished surface (while all others are coarse surfaces of the
> rectangular solid) without the need of transmission through a ground
> surface before. I'm not sure, if by defining a third volume I simulate
> the case of a rectangular solid with one single polished side?!

I tried to explain in my previous posting that the G4LogicalBorderSurface (your ground surface) kicks in only when the photon will exit into vol2 and the combination of vol1/vol2 is found among the list of G4LogicalBorderSurfaces in the corresponding table. I understood that your vol3 will butt against vol1 only at one side of the rectangular solid (vol1). All other sides have a volume combination vol1/vol2 for which you have defined a rough surface.

> I hope you understand my special case!

Well, I am not so sure anymore, but I think I do, and yours is not really such a special case.

Peter

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1 Ok: Re: How to define one single surface of a solid differently   (Susanne Jungmann - 15 Dec, 2010)
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