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Forum: Processes Involving Optical Photons
Re: Question Boundary interaction model (Nicolas Di Vara)
Date: 14 Nov, 2012
From: Sehwook Lee <Sehwook Lee>

Dear Nicolas,

>I have been trying to assess the characteristics of boundary interaction in Geant4 using the condition "frontpainted" (both polished and ground) for the dielectric_dielectric interface. I specified the imaginary and real refractive index of the surface and used a random polarization for a gps with simple optical photons.

I am pretty not sure why you need to specify the complex refractive index for dielectric material. The complex refractive index is needed for absorbing medium like metal that photons are absorbed on its surface with some probability according to polarization, energy and incident angle. I think the refractive index for dielectric material has only real value unlikely absorbing medium. Also, good dielectric material has almost no absorption.

If dielectric material really has absorption depending on the energy of photon, polarization and incident angle, please let me know. If so, I have known about it wrong. I would like to correct myself about this physics fact.

As far as I know, if you need photon absorption inside dielectric material (strictly speaking, it is light attenuation), I think you should specify light attenuation length instead of the complex refractive index.

If you go to the wikipedia, there will be very kind explanation about the complex refractive index. http://en.wikipedia.org/wiki/Refractive_index

Thank you, Sehwook

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1 None: Re: Boundary interaction model   (Erik Dietz-Laursonn - 15 Nov, 2012)
(_ None: Re: Boundary interaction model   (Sehwook Lee - 15 Nov, 2012)
(_ None: Re: Boundary interaction model   (Erik Dietz-Laursonn - 16 Apr, 2013)
(_ Warning: Re: Boundary interaction model   (Andrea Celentano - 16 Jan, 2015)
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