Learning Forum

[Ayoub NAOUI]

Hello everyone,

 

To observe the photothermal heating and cooling on a material resulting from a pulsed laser source on Lumerical.

I combine the FDTD and HEAT solvers, while using the FDTD solver to determine the absorbed power(Pabs) (using the Pabs adv analysis group)  by this material (except that the laser source is not pulsed; i'm using a fiber with a power source), i have been able to plot the power absorbed and save it as .mat file.

 

After, in the HEAT solver, I load the .mat file to see the temperature distribution on my material. 

 

I've tried using the source shutter parameters in the Heat transient window to define a pulse, but I can't find any difference in temperature distribution when I vary the pulse duration between 100fS and 1µS (whereas in the measurements, pulse duration has a big impact on temperature distribution). 

I don't know how to proceed, as I don't want to define my own transient temperature/power boundary conditions, because in my case the temperature distribution is not uniform over my material, which is the case in this type of simulation.

 

Any help or advice is greatly appreciated!

Thanks in advance

[Guilin Sun]

I guess you quantify the result in steady state. In such case, the duration time is not important. the important thing is how much power is used in the simulation. 

If you check the transient result, it should change with time under the same optical power source. Please use a point monitor to record the temperature vs time and see if it is expected. Please check the mesh settings, time step sizes, and ensuring that the material properties are accurately defined, especially if they are temperature-dependent.

[Ayoub NAOUI]

Hello Guilin,

Thanks for your answer, I tried to run the simulation in transient mode but I get this error.

Do you have any idea please about this error ?

Thanks in advance,

Ayoub

 

[Guilin Sun]

 

The error "application terminated with the exist string: handup (signal 1) " is from MPI. You can try another mpi if it still fails after restarting the computer. You may also try to install the latest version.