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optical absorption in GaAs

Posted Nov 5, 2014, 4:41 a.m. EST RF & Microwave Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 0 Replies

Lu Ding
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Hi,

I am studying the plasmonic effects of gold photoconductive antenna on a substrate of GaAs and I follow the model of Plasmonic Wire Grating. I try to calculate the optical absorption on each point in GaAs using the Total Power Dissipation Density (emw.Qh). I am expecting to have enhanced absorption around the gold antenna.
However, emw.Qh gives both positive and negative value which I cannot understand. I thought that the total power dissipation density should be positive. Can anyone comment on this and tell me where I am going wrong?

Best,
Lu

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0 Replies Last Post Nov 5, 2014, 4:41 a.m. EST
COMSOL Moderator

Hello Lu Ding

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