Spontaneous emission lifetime
I am using the OptiFDTD to indirectly calculate the spontaneous emission lifetime.
This can be achieved by calculating the power radiated from a point source.
I started using a simple structure like a flat substrate and I compare what I get using the FDTD method with the theory.
For dielectric interfaces, I found perfect matching between the theory and FDTD results. However, for plasmonic substrates, like gold for example, the FDTD and theoretical results are identical when the dipole at distances larger than 100 nm from the substrate. When the dipole is very near to the substrate, distance less than 100 nm, the theoretical results shows decrease to the lifetime and the FDTD results gives increase to the lifetime.
Can you help me to solve this issue?
Does the FDTD method consider the nonradiative decay when the dipole is near to plasmonic materials?
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