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Forum: Processes Involving Optical Photons
Re: None Surface Concept!!!!! (Davinder Siwal)
Re: Feedback Re: Surface Concept!!!!! (Sam Blake)
Date: 10 Mar, 2011
From: Gumplinger Peter <Gumplinger Peter>

Let me add that the LogicalSkinSurface is most useful when you have a mirror, for example, immersed inside a dielectric volume. In this case, you should think of the problem not as photons bouncing around 'inside' the volume, but that they can bounce off the surface from the 'outside' also. Let's say you have a suspended spherical mirror inside a radiator. In this case, you could give the sphere a LogicalSkinSurface of type dielectric_metal and photons will bounce off it. It doesn't matter with how many dielectric volumes the mirror is in touch with. Its reflectivity is always the same.

Another example is a long optical fiber with one end coded with a reflector. You can code the reflector as a little disk flush with the fiber end (either just inside the fiber or touching it outside) and give that disk a LogicalSkinSurface instead of defining a LogicalBorderSurface between it and the fiber.

The logic with which the G4OpBoundaryProcess searches for the existence of Logical...Surfaces is here:

http://www-geant4.kek.jp/lxr/source/processes/optical/src/G4OpBoundaryProcess.cc#L264

(preStepPoint is in the volume about to be left, postStepPoint is already in the volume across the boundary)

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1 None: Re: Surface Concept!!!!!   (Davinder Siwal - 10 Mar, 2011)
(_ More: Re: Surface Concept!!!!!   (Gumplinger Peter - 11 Mar, 2011)
(_ None: Re: Surface Concept!!!!!   (Davinder Siwal - 11 Mar, 2011)
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