Time-domain simulation of surface plasmons in ultra-compact optical devices

In: 3rd Workshop on Numerical Methods for Optical Nano Structures
ETH Zurich, Switzerland (2007)
Buchaufsatz / Kapitel / Fach: Elektrotechnik
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.