Recent content by rkrishnasanka

I'll put up the derivation tomorrow. I'd like to know if I'm missing out something. I was under the impression that the perturbation used in the entire derivation was still a linear operation. Just like it is Quantum mechanics also.

My question stems from a discussion I had with my colleague today. In Electomagnetic coupling , like in waveguide structures. We apply pertubation theory to find out the coupling between various modes that get coupled in the device. My colleague said that the coupling interaction was...