It is evident from looking at the listing of current NSC objects in chapter 12 that there is no single object of the desired shape. There are however, Rectangular Volume and Rectangular Torus Volume objects that can be combined to create the lightpipe.

Let’s go ahead and create the lightpipe from scratch.

Open ZEMAX and switch to pure non-sequential mode. (File > Non-Sequential mode)

Set the system units to mm and W/Cm2 (System > General > Units)

Set the wavelength to 0.55 um (System > Wavelengths)

Set the Maximum Nested/Touching Objects under System>General>Non-Sequential to 5. This defines an upper limit on how many objects can be inside, straddled, or in direct contact with each other. Do not set this number larger than you need since it will require more memory without any additional benefit.