|Message: Re: Photon Trapping Fraction||Not Logged In (login)|
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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.
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