i'm looking for the right way to compute the dispersion relation related to SPR surface plasmon polaritons using the formula ( Kspp = (w/c)sqrt((eps_d*eps_m)/eps_d+eps_m)
should I consider both real and imaginary parts of the dielectric function (available in matrix form in Matlab) or only the real part, I'll be thankful for your positive responses
Its the real part, we often deal with.
For details, you can follow the paper of ours:
Article Grating-Coupled Surface Plasmon-Polariton Sensing at a Flat ...
Especially, the supporting information might be of your help!
yes, you have to include both the real and imaginary parts of the dielectric constant.
Oussama Baitich
Your question is discussed in chapter 2 of classical textbook of H. Raether "Surface Plasmons on Smooth and Rough Surfaces and on Gratings", Springer-Verlag, Berlin 1988.
Epsilon must be in complex form.
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