Understanding the formula used by FDTD to calculate absorbed power per unit volume

I’m looking for a reference that shows a derivation of the formula for the absorbed power per unit volume as discussed in this Lumerical Knowledge Base entry. Anyone know of one? I’d like to understand this better.

Hi @patrick.goley

The loss defined in KB is Ohmic loss and is true if current density is zero (which is the case in our optical simulaitons). You can take a look at this link, check Eqs. 1.9.6 and 1.14.5.

Please let me know if you have further questions.


This is exactly what I was looking for. Thanks @bkhanaliloo!

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I am glad that it was helpful :slight_smile: