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What is the difference between surface integration and surface average

Posted 19 oct. 2017, 15:48 UTC−4 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 19 oct. 2017, 17:57 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 7 years ago 19 oct. 2017, 15:51 UTC−4

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 19 oct. 2017, 16:35 UTC−4

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 19 oct. 2017, 17:43 UTC−4

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 19 oct. 2017, 17:57 UTC−4
Updated: 7 years ago 20 oct. 2017, 12:06 UTC−4

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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