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Forum: Processes Involving Optical Photons
Re: None Refraction has not occur (Davinder Siwal)
Date: 18 Jan, 2011
From: Gumplinger Peter <Gumplinger Peter>

Hi,

>       if (particleName == "opticalphoton") 
>         {
>           G4cout << " AddDiscreteProcess to OpticalPhoton " << G4endl;
>           pmanager->AddDiscreteProcess(theAbsorptionProcess);
>           pmanager->AddDiscreteProcess(theRayleighScatteringProcess);
>           pmanager->AddDiscreteProcess(theBoundaryProcess);
>           pmanager->AddDiscreteProcess(theMieHGScatteringProcess);
>           pmanager->AddDiscreteProcess(theBoundaryProcess);
>         }
> 
>     }
> }

I don't know what happens when you attach theBoundaryProcess twice to the optical photon. This is clearly a programming error.

I suggest you carefully check your code against the examples. Many G4 users have had no difficulty defining a correct optical simulation in Geant4 by carefully consulting our tutorial material, manuals and examples, and have done so without seeking step by step guidance on this forum.

As a first step it is usually a good idea to do away with a G4OpticalSurface and simply specify the index of refraction for both touching dielectric. In that case, you'll simulate a perfectly smooth interface with the refraction/reflection probabilities calculated from Snell's Law and the nominal surface. If all of your photons strike this surface at a certain large angle, they will all be internally reflected and you won't see refraction. (this may well be your problem also).

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