Learning Forum

[xiaofei.xiao15]

https://optics.ansys.com/hc/en-us/articles/360041686234-Photothermal-heating-in-plasmonic-nanostructures

in the above example, Photothermal heating in plasmonic nanostructure is calculated.

However, I want to calculate the transient heat flow. All configurations of the system are the same, but with a much larger size of the structure and PML in all directions.

How to set the model for this calculation?

can we do the optical simulation first to get the absorption profile and then use this as the heat source for a short time to switch on the heat source? then we can calculate the heat flow.

the main difficulty is I am not sure how to set the heat source. Can the absorption profile be used for the initial heat source?

thanks

 

[Guilin Sun]

The modeling and simulation methodology are the same as the online example. You will need to do FDTD simulation first, and then import the absorbed power into HEAT.

For transient HEAT simulation, you just choose the "transient" instead of "Steady state". Please refert the examples:

https://optics.ansys.com/hc/en-us/articles/360042273574-Heat-flow-in-solids

https://optics.ansys.com/hc/en-us/articles/360042273534-Transient-heat-flow-in-a-graphene-coated-glass

Thermal-Conductive and Transient Simulations - Transient Simulation Settings

Please try and let me know if you have questions.

 

[xiaofei.xiao15]

thanks very much. does this means that the absorption profile would be the light source at the beginning? those parts of the material will absorb the energy immediately and then disperse to other places?

[Guilin Sun]

The example does not investigate the transient optical absorption, but a steady-state result. Light is absorbed in the device and then the absorption can be imported into HEAT as usual. Please try a small device to make sure the simulation methodology works for you.