Rsoft has the ability to create multilayered devices, as was done previously using ATLAS/TCAD. Rather than defining a structures through scripts as is done with ATLAS, information about the layers can be defined in tables that are accessed in Rsoft CAD.
To begin adding layers to a device, such as a waveguide, first draw the device in Rsoft CAD. To design a structure with a substrate and rib waveguide, select Rib/Ridge 3D Structure Type in the Startup Window.
Next, design the structure in Rsoft CAD.
The Symbol Table Editor is needed now not only to define the size of the waveguide, but also the layer properties. The materials for this waveguide will be defined simply using basic locally defined layers with a user-defined refractive index. Later, we will discuss importing layer libraries to use real materials.To get used to the parameters typically needed for this exercise, layer properties may not need to be defined now before entering the Layer Table Editor.
The Layer Table Editor is found on the Rsoft CAD sidebar. First, assign the substrate layer index and select new later. The layer name, index and height are defined for this exercise.
After layers have been chosen, the mode profile can be simulated.