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Forum: Processes Involving Optical Photons
Re: Question Compare surface roughness and travelling path of photons (Susanne Jungmann)
Date: 15 Sep, 2010
From: Gumplinger Peter <Gumplinger Peter>

Hi Susanne,

> First of all is there a recommendation concerning which model to use?

The UNIFIED model has more 'whistles and bells' and so, in principle, allows you to specify a more complicated surface behaviour. GLISUR is much simpler and has only really one surface parameter. I'd start a simulation using the simpler model and see how much the result I am getting is affected by the parameter and whether it chives with what I expect, maybe from a lab test. I'd move to UNIFIED if that's warranted, thought having more parameters requires you to have a good guess or some other mean to specify them.

> And second how can I compare if the surface I simulate by setting the values

> polish and sigma_alpha respectively are of the same roughness?

Well, that's a good question - I don't know the answer because the roughness is specified in the two models by very different (geometric) parameters. Actually, one could use the simulation to find out by playing with each model's roughness parameter until they both give the same result - like the number of detected photos etc.

Peter

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