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Forum: Processes Involving Optical Photons
Re: Question how to add complex refrative index for a dielectric-dielectric surface
Re: Feedback Re: how to add complex refrative index for a dielectric-dielectric surface (Gumplinger Peter)
Re: Question Re: how to add complex refrative index for a dielectric-dielectric surface
Date: 14 Apr, 2014
From: Gumplinger Peter <Gumplinger Peter>

Hi, I cannot really add anything to my previous posting.

> A photon is generated in LiquidScintillator, and transported to the LiquidScintillator and Window (made of glass) interface. It reflected back or transmit through the interface. As the refrative index of window and LiquidScintillator are very closed, the photon is very likely to transmit through the interface.

Define this surface to be dielectric_dielectric and give the window only a real index of refraction.

> Because the Absortion length of glass is large, the photon is with little probability to be absorbed, instead, it travels to the window and photocathode (K2CsSb) interface. 
> 
>     Because K2CsSb is some kind of semiconductor with non-ignorable imaginary part, which, will make a great difference to the reflectivity of the interface. If the photon is not reflected, it is expected to be transimitted through and absorbed, causing the photoelectric effect.

Make this surface dielectric_metal (e.g. think of your K2CsSb not as a semiconductor but as a 'metal' as far as G4 optical photon simulations are concerned.) Give this surface (or the K2CsSb material) the complex refractive index.

> 
>     The problem is when I set the complex refrative index for the photocathode, the photons seems to disappeared once they get to the surface.

The only photons that should 'disappear' are the ones not reflected. You can find out what reflectivity is calculated by interrogating:

CalculateReflectivity();

in G4OpBoundaryProcess.cc

Your detected photos will be:

http://www-geant4.kek.jp/lxr/source//examples/extended/optical/LXe/src/LXeSteppingAction.cc#L182

Please, read:

http://www-geant4.kek.jp/lxr/source/examples/extended/optical/LXe/README#L77

And, as I said, whether the photo detection happens in a semiconductor or a metallic photocathode, you should not think if them different in terms of the G4 simulation.

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1 Question: Re: how to add complex refrative index for a dielectric-dielectric surface   (cyuchiash - 15 Apr, 2014)
(_ Feedback: Re: how to add complex refrative index for a dielectric-dielectric surface   (Gumplinger Peter - 15 Apr, 2014)
(_ None: Re: how to add complex refrative index for a dielectric-dielectric surface   (cyuchiash - 20 Apr, 2014)
(_ Feedback: Re: how to add complex refrative index for a dielectric-dielectric surface   (Gumplinger Peter - 22 Apr, 2014)
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