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Keywords: surface finish
Forum: Processes Involving Optical Photons
Date: 11 Feb, 2002
From: Gumplinger Peter <Gumplinger Peter>

Further to my previous message:

A)Polished surface with a difuse reflector coating (e.g. carbon foil) a few micrometers apart from the polished surface.

There is presently no G4OpticalSurfaceFinish that would allow you to have a polished interface between a medium and a thin (air) layer with a diffuse reflector next to it. However, you can specifying that the G4OpticalSurface has a 'groundbackpainted' G4OpticalSurfaceFinish:

SetType(dielectric_dielectric)

SetFinish(groundbackpainted)

but then you

SetModel(unified)

SetSigmaAlpha(0.0)

or

SetModel(glisur)

SetPolish(0.0)

The reflection of the back foil will then be Lambertian.

Of course, you'll also need to specify the index of refraction of the small air (vacuum) gap between the foil and the medium by constructing a G4MaterialPropertiesTable with entries for RINDEX, and attach it to the G4OpticalSurface.

      

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1 Ok: Re: Surface finish   (Rui Bugalho de Moura - 12 Feb, 2002)
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