Time-domain simulation of surface plasmons in ultra-compact optical devices
An extended equivalent circuit (EEC) finite-difference time-domain (FDTD) scheme is presented. This technique exhibits high versatility, improved efficiency for the case of non-uniform meshes, and unconditional stability based on novel criteria for dispersive media. In the special case of plasmonic metals Drude- and combined Drude/Lorentz-type of dispersion models can be applied to accurately approximate their frequency dependent permittivities in time domain simulations. With the help of the EEC FDTD technique an ultra-compact power splitter is analyzed at optical frequencies. The functionality of this device is based on the frequency selective coupling of two surface plasmons.
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