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What is the difference between surface integration and surface average

Posted Oct 19, 2017, 3:48 p.m. EDT 4 Replies

Ahmad DArweesh
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Please, I have a question? I am calculating the electric field in GaAs which has a gold nanostructure on the top. I want to know what is the difference between using surface integration and surface average. When I use both I get diefferent results and I really confused which one should I use to get the real values of electric field in the GaAs.

Thanks, Ahmad,

4 Replies Last Post Oct 19, 2017, 5:57 p.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 7 years ago Oct 19, 2017, 3:51 p.m. EDT

The surface average is the integral of the quantity divided by the surface area over which it is integrated.

Jeff

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Jeff Hiller
The surface average is the integral of the quantity divided by the surface area over which it is integrated. Jeff
Ahmad DArweesh
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Posted: 7 years ago Oct 19, 2017, 4:35 p.m. EDT

Thanks, Jeff for your response. I just want to clarify something. I want to know which one should I use in my case cz I got the different trend and I do not know which one is the right one.

Thanks, Jeff for your response. I just want to clarify something. I want to know which one should I use in my case cz I got the different trend and I do not know which one is the right one.
Jeff Hiller COMSOL Employee

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Posted: 7 years ago Oct 19, 2017, 5:43 p.m. EDT

Can you clarify what it is that you are trying to get out of that simulation and how either the average or integral comes in?

Jeff

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Jeff Hiller
Can you clarify what it is that you are trying to get out of that simulation and how either the average or integral comes in? Jeff
Ahmad DArweesh
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Posted: 7 years ago Oct 19, 2017, 5:57 p.m. EDT
Updated: 7 years ago Oct 20, 2017, 12:06 p.m. EDT

I am sweping a structure width of gold which placed on the top of GaAs. Light is normally incident on the structure. I want to calculate the light intensity in the GaAs. which one should I use surface integration or surface average to get the right values? I am using this equation (emw.normE^2). I attached two imgs

I am sweping a structure width of gold which placed on the top of GaAs. Light is normally incident on the structure. I want to calculate the light intensity in the GaAs. which one should I use surface integration or surface average to get the right values? I am using this equation (emw.normE^2). I attached two imgs

Attachments:

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