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Forum: Processes Involving Optical Photons
Re: Question Photon Trapping Fraction (matthew)
Re: Feedback Re: Photon Trapping Fraction (Gumplinger Peter)
Date: 02 Mar, 2016
From: matthew <matthew>

Peter,

thanks for getting back so quickly. At your suggestion, I have removed the OpticalSurface and I'm now relying solely Snell's law.

As I understand it, the trapping efficiency should be given by:

f = 1/2 * (1-n2/n1)

where n1 = 1.46 (core) and n2 = 1.39 (cladding), this should give around 2.4%. Surrounding air is set to n = 1.0.

In my simulation I have an optical fiber with absorbing detectors at each end (24" fiber), and I'm counting the number of photons that get absorbed. If I launch an isotropic source of photons in the middle of the fiber (2.5 eV), about 30% of them get collected in the end detectors.

Shouldn't the fraction of detected photons be closer to the above calculated trapping fraction? Am I understanding the problem incorrectly?

thanks for any advice.

matt

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1 Feedback: Re: Photon Trapping Fraction   (Gumplinger Peter - 02 Mar, 2016)
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