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Question unexpected rise of light yield with increasing surface roughness (sigma_alpha) 

Forum: Processes Involving Optical Photons
Date: 21 Feb, 2011
From: Martin Goettlich <Martin Goettlich>

Dear experts,

I observe a rise in the light yield (optical photons hitting the detector) with increasing surface roughness (sigma_alpha). What I also observe is that the number of absorptions at the boundaries decreases. This behaviour is not what you expect comparing to measurements. The light yield should decrease, right?

Details about the simulation:

I simulate a scintillating crystal fibre (diameter 0.75 mm, length 10mm). Photo-detectors at both sides of the fibre.

Surface: - unified model - groundbackpainted - dielectric-dielectric - specular lobe 100% - surface refraction index 1.0 (thin layer of air) - reflectivity: 95%

I want to simulate a crystal embedded in BaSO4 cement.

I'm grateful for any hints.

Best regards,

Martin Goettlich

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1 Feedback: Re: unexpected rise of light yield with increasing surface roughness (sigma_alpha)   (Gumplinger Peter - 04 Mar, 2011)
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