Lesson 10 – Lorentz-Drude Model for Metal and Surface Plasma

Lorentz-Drude Model for Metal and Surface Plasma Introduction

OptiFDTD versions 2 through 4 provided a Drude model and a separate Lorentz model for metal, plasma and dispersive material simulation. The two models work only for 2-dimensional (2D) layouts. Based on feedback from our customers, OptiFDTD 5.0 introduced a combined model called the Lorentz-Drude model. This model can handle both the Drude and Lorentz dispersive…

Enhancement

In the above parameter set up, if we only set one term, and set resonant frequency as zero, we will simulate a Drude model material 7 Click “Store” to save the defined material. The “Lorentz_Drude_Al” will be listed in the FDTD-Dielectric folder of the Waveguide Profile Designer 8 In the directory under “OptiFDTD_Designer1” Profile folder, right-click…

Discussion

This lesson utilizes 2D layout to demonstrate usage of Lorentz-Drude materials in OptiFDTD simulations. Materials in this layout can be switched to perfect conductor or other metals to observe their interaction with the optical field 3D simulation for Lorentz-Drude material has the same concept as 2D simulation. However, if Lorentz-Drude material in 3D layout touches the…