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Simple Reflectivity/Transmission calculation for RF Air/Glass boundary

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Hello.

I am an absolute beginner to COMSOL and am hoping to eventually use it to simulate some nanoparticle scattering effects for solar cell applications.

I have built a very simple model consisting of an Air - Glass - Air geometry and have excited a wave at a port on one of the Air sides. I've included PML and a suitable mesh. I see that the wave propogates through the air, into the glass (wavelength reduces by a half as n = 2.05 in glass) and back out into the air.

I would like to know a good method of proving the well known Fresnel equations for Reflectivity (n1-n2)/(n1+n2) mod all squared.

So far I have done line integrations at each boundary looking at Power Averages, and Ez, but I am not getting data that arrives at my calculated answers. Can anyone recommend a strategy for proving that the intensity of the wave obeys the Reflection/Transmission values calculated by hand?

Many thanks.

2 Replies Last Post 22 nov 2012, 06:33 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 22 nov 2012, 01:40 GMT-5
Hi

What about taking a look at the model library, i.e. "Fresnel equations" that should be a good starter. You have also many models on the model gallery on the main COMSOL web site

--
Good luck
Ivar
Hi What about taking a look at the model library, i.e. "Fresnel equations" that should be a good starter. You have also many models on the model gallery on the main COMSOL web site -- Good luck Ivar

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Posted: 1 decade ago 22 nov 2012, 06:33 GMT-5
Hi

Thanks for that tip. I had a look through the model documentation, but I can't see how it can help me with my problem. They include a plot of reflectance/transmission but it says they just plot Ey data. That doesn't really fit my model as I have a number of wave oscillations on each side of the glass slide.

I still don't really know what is the best parameter to look for to prove Fresnel equations. Any other ideas?

Cheers.
Hi Thanks for that tip. I had a look through the model documentation, but I can't see how it can help me with my problem. They include a plot of reflectance/transmission but it says they just plot Ey data. That doesn't really fit my model as I have a number of wave oscillations on each side of the glass slide. I still don't really know what is the best parameter to look for to prove Fresnel equations. Any other ideas? Cheers.

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