Learning Forum

[ph23resch01002]

Dear Sir/Madam,

I am currently using Lumerical Charge to simulate an active metasurface unit cell. I have attached a picture of the unit cell for your reference. I will briefly describe the unit cell structure:

The unit cell consists of a SiO2 substrate on which a Si slab is placed. On top of the Si slab, there is a GaAs layer, followed by an Al2O3 layer, and finally Si resonators. The voltage is applied between the Si resonator and the GaAs layer using the electrical connection boundary condition.

I attempt to sweep the voltage from 0 V to 12 V to observe the charge distributions. The simulations run smoothly up to 8.5 V; however, beyond this point, the simulation halts and displays the attached error.

I have also checked the online references for troubleshooting this issue and made the following adjustments in the Charge Solver advanced settings:

1. Solver type: Kept as Gummel.
2. Global iteration limit: Increased from 40 to 50.
3. Gradient mixing: Changed from Disabled to Conservative.
4. Update limiting values: Decreased.

Despite these changes, the problem persists. Could you please assist in resolving this issue?

Thank you for your support.

[Niki Papachristou]

Hi Bharathy,

Thank you for reaching out to us. For you case may I ask you whether you have checket your CHARGE simulation using the Partitioned volumes in finite element solvers - Simulation object?

After partitioning the sumulation if you have a none in one of your domains means that you dont have a material there and the simulation might be stoping for that.

Let me know if that's the case.

Kind Regards,

Niki