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Warning Re: Real and Imaginary Parts of the index of Refraction. 

Forum: Processes Involving Optical Photons
Re: Question Real and Imaginary Parts of the index of Refraction.
Re: Feedback Re: Real and Imaginary Parts of the index of Refraction. (Gumplinger Peter)
Re: None Re: Real and Imaginary Parts of the index of Refraction. (Daniel Bonifacio)
Date: 20 Mar, 2009
From: Gumplinger Peter <Gumplinger Peter>

Hi Daniel,

The program (source/processes/optical/src/G4OpBoundaryProcess.cc) has two stages when you set a dielectric_metal surface and provide both Re and Im index of refraction. The probability of reflection (theReflectivity) is calculated in the routine:

G4OpBoundaryProcess::GetReflectivity(G4double E1_perp,G4double E1_parl,G4double incidentangle,G4double RealRindex,G4double ImaginaryRindex)

from the arguments provided.

This probability is later used in DielectricMetal() to sample reflection/absorption. The actual angle of reflection is then calculated in the method DoReflection. If you provide 'glisur' or 'polished' the angle of reflection will be the angle of incidence. If you choose 'unified' and you have provided the probabilities of the various types of possible reflections in the UNIFIED model, the reflection angle is calculated accordingly.

Although, the program flow allows you to specify 'unified', I would argue on physics grounds, that once you give ReR, ImR, and an incident angle (with respect to a Facet Normal) and the reflectivity is calculated from that information, you are no longer free to choose the reflection angle as is allowed in the UNIFIED model. I would argue you should choose in this case, 'glisur' and either 'polished' or 'ground'.

Peter

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1 Ok: Re: Real and Imaginary Parts of the index of Refraction.   (jdswado@gatech.edu - 22 Mar, 2009)
(_ Question: Re: Real and Imaginary Parts of the index of Refraction.   (Daniel Bonifacio - 23 Mar, 2009)
(_ Warning: Re: Real and Imaginary Parts of the index of Refraction.   (Gumplinger Peter - 23 Mar, 2009)
1 Ok: Re: Real and Imaginary Parts of the index of Refraction.   (Daniel Bonifacio - 25 Mar, 2009)
2 Question: Re: Real and Imaginary Parts of the index of Refraction.   (jdswado@gatech.edu - 07 Aug, 2009)
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