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Hello, I want to build Photoconductive Antenna using COMSOL and I faced several problems. Could you help please?
Posted Apr 5, 2021, 8:02 a.m. EDT Low-Frequency Electromagnetics, RF & Microwave Engineering, Wave Optics Version 5.5 0 Replies
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Dear Brothers,
I want to build a Photoconductive Antenna using Comsol (I use 5.5 version). However, I need to apply a voltage difference between electrodes as well as I need to apply a femtoseconds laser pump. So, I used AC/DC physics (Electric Currents physics) for applying voltage difference and RF physics (Electromagnetics Waves, Frequency Domain physics) for applying the laser pump.
I faced the following issues:
1) Should I run my study in Time or Frequency domain? 2) How can I do a manual coupling between AC/DC and RF Physics (because Comsol doesn't provide auto coupling between those Physics)? >> I tried to do that, I worked in Time Domain and I added the electric field of AC/DC module to RF module as it is shown in Figure-1 that I attached. I don't know whether if what I did was correct or not because I got values of AC/DC electric field in RF. 3) How can I set that laser pump in the right way. I built laser pump in terms of Average power of laser using Gaussian Pulse and Function (Analytic). Figure-2 shows the plot that I got from those functions. So, if what I built is correct, how can I use it in RF module to get laser pump? 4) What is the rightest way to get values of Photocurrent in those physics?
Thank you Sincerely Aiman
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Hello Aiman Fakieh
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