Learning Forum

[l76124262]

I'm researching a microring modulator (MRM) with a variable-width ring, unlike the standard example on your website which uses a single 2D cross-section. My structure’s non-uniform width requires a 3D CHARGE simulation to capture the spatial carrier distribution as a function of bias voltage.

Is there a way in Ansys DEVICE to perform a 3D CHARGE simulation and export this distribution (charge.mat) for use in FDTD? Additionally, would it be possible to simulate the transmission spectra in FDTD under different bias voltages?(In lumerical MRM example, MODE is used to simulate the ring's cross-section. However, with my ring’s varying width and varying neff, a single cross-section simulation is insufficient so I have to simulate the transmission of MRM in FDTD rather than INTERCONNECT or MODE)

Thank you for your help.

[Guilin Sun]

You can simulate 3D device in CHARGE. But care should be taken as it will significantly increase the memory requirement and consequently slow down the simulation.  

FDTD solves Maxwell Equations which do not have the variable of applied voltage. Thus you will need to perform CHARGE simulation first. Similarly for INTERCONNET and MODE.

Once the result is obtained from CHARGE you can import the np density attribute to FDTD, which has the voltage and its index which you can sweep them to get different transission under different voltage.

[l76124262]

Thank you very much for your reply! Do you have any recommended tutorials for 3D CHARGE simulations?

[Amrita Pati]

Hi,

I apologize for the delay in getting back to you. Guilin is out of office for the time being. I will recommend going through the CHARGE course on Ansys Innovation Courses. These are free to access and I find them really useful to get started on a topic:  Ansys Lumerical CHARGE.

Regards,
Amrita