TAGGED: 3DFDTD, absorption, importdata
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July 19, 2024 at 10:15 am
Term
SubscriberHi all,
I want to simulate the absorption curve of a substance in the infrared region.
I will write down the condition of the simulation below,
type of simulation: FDTD 3D
there is a sphere whose dispersion follows the imported data I made. Using the Lorentz function, I calculated the refractive index and fabricated the sphere myself.Â
I inserted a Gaussian light source and monitored the power of transmittance with a frequency-domain field power monitor on the opposite side.
However, I have not obtained the appropriate results. I couldn't get absorption at a wavelength of 3um.
Â
Could you please tell me your advises?ÂThank you in advance.ÂBest regards -
July 19, 2024 at 6:33 pm
Guilin Sun
Ansys EmployeeI am not sure what does this mean "I couldn't get absorption at a wavelength of 3um." do you get absorption at other wavelengths?
For a fixed Gaussian beam, assuming there is no side leakage, the absorption can be calculated as A=1-R-T where R is the reflection.
You can also use a less-accurate method to add a 3D monitor on the sphere, and using script to calculate the absorption power and power ratio. Please refer to this analysis group:
This less accurate method means you will need to integrate the absorbed intensity. Since it needs integration in 3D, it is is less accurate than the built-in method to calculate RT directly. But it should give you fair result compared to your experiment as experiment measurement also has some kind of errors.
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