Message: Re: Polarisation of photon Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Feedback Re: Polarisation of photon 

Forum: Particles
Re: None Polarisation of photon (rajani)
Date: 28 Mar, 2007
From: Gumplinger Peter <Gumplinger Peter>

If you don't specify a polarization for your optical photon, a random polarization will be assumed. This code is in G4PrimaryTransformer::GenerateSingleTrack and a warning is written:

*** G4Exception : ZeroPolarization
      issued by : G4PrimaryTransformer::GenerateSingleTrack
Polarization of the optical photon is null. Random polarization is assumed.
*** This is just a warning message.
This warning message is issued up to 10 times.

So, unless you want to simulate polarized light and you can live with the warning, you don't have to do anything.

As for why the polarization is important in the simulation of Fresnel reflection/refraction, I suggest you read Hecht/Zajac, Optics, 4.3 where you'll find that the amplitude transmission/refection coefficients are not the same for EM waves with the E-field normal to or in the plane of incidence.

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: Polarisation of photon   (Campagne J.E - 16 Apr, 2007)
(_ Feedback: Re: Polarisation of photon   (Peter Gumplinger - 16 Apr, 2007)
 Add Message Add Message
to: "Re: Polarisation of photon"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]