Learning Forum

[anindya]

Dear Experts,

Using the index perturbation model (Link: https://optics.ansys.com/hc/en-us/articles/360034901753-np-Density-and-Temperature-Index-Perturbation-Simulation-object) we can get the plot of the real part of refractive index (n) as a function of electrical power for any defined materials. Can we get the imaginary part of the refractive index (k) of the same material as a function of electrical power? Is there any available feature to do such a thing in FEEM or mode solver? Any help in this regard will be highly appreciated.

Thanks and regards,

Anindya Bose

[Guilin Sun]

Do you mean the material index with perturbation, or the effective index of the mode?

The conversion theory is here  https://optics.ansys.com/hc/en-us/articles/360034382494-Charge-distribution-to-change-in-refractive-index-theory

So if the charges are uniform, you can get the perturbated material complex refractive index:

If the np density is simulated from CHARGE, it is not uniform then you cannot import or get the refractive index perturbation.

However when the np density is applied to a waveguide, and you use FDE or FEEM you will be able to get the mode effective index, real and imaginary parts.

 

 

 

[anindya]

Dear Mr Guilin Sun,

Thank you so much for your comment. I was just asking for the mode effective index during waveguide simulation only (using the np density feature).In my case, I am only able to see the real part of neff vs Voltage plot. Is there any way to see its imaginary part?

Thanks and regards,

Anindya Bose

[Guilin Sun]

Once you get neff from FDE you will be able to plot imag(neff) using script.

neff=getdata("mode1","neff")

 

Please first check if the neff has nonzero imaginary part.