Learning Forum

[Yun]

I want to set the material to full absorption.

 

If I make a new 3D Sample Data in the Material database and increase the k value a lot in the wavelength area to simulate, I think it will be completely absorbed, but I wonder if this is the right way and if there is any other good way. But the problem is that if I raise the k value, I get a lot of RAM capacity pressure. And it slows down the calculations a lot.

[Guilin Sun]

Unfortunately there is no "Perefect" absorbing material in real world, or in simulation. Even PML cannot absorb completely without sufficient thickness and proper artificial material parameters. 

When the imaginary part of the refractive index is too large, FDTD will need extremely fine mesh to resolve lossy wave. 

Please reconsider your goal, and physics.