Rsoft comes with a number of libraries for real materials. To access these materials, we can add them at any time from the Materials button on the side. However, to build a Multilayer structure that can utilize many materials, select “Multilayer” under 3D Structure Type.

Now, select “Materials…” to add desired materials. Move through the RSoft Libraries to chose a material and use the button in the top right (not the X button, silly) to use the material in the project. Now select OK to be brought back to the Startup Window, where we must now design a layered structure using these materials. Note that while building the layers, you can add more materials.

Selecting “Edit Layers…” on the Startup window brings you to the following window. Here, you can define your layers by selecting “New Layer”. Enter the Height and Material of the layer and select “Accept Layer” and repeat the process until the structure is finished. Select OK when done and select OK on the Startup window if all other settings are complete. This is my structure. Note that my structure size adds up to 1. Remember what the size of your layers are.

Now, design the shape of the structure. I’ve made a rectangular waveguide. What is also important to consider is where the beam should enter the structure. By default, the beam is focused across the entire structure. In the case where a particular layer is meant to be a waveguide, this should be reduced in size. By remembering the sizes of the layers however it will not be difficult to aim the beam at a particular section of the waveguide. For my structure, I will aim my beam at the 0.2 GaInAsP layer. The positioning, width, height, angle and more of the launch beam can be edited in the “Launch Parameters” window, accessible through “Launch Fields” on the right side.

Finally, run a simulation with your structure!