Guilin Sun
Ansys Employee
The software its self uses "transmission" in general, it can be reflectance or transmittance. You can determine if it is R or T.
To achieve zero reflection at approximately 5.8 microns, you will need to optimize your device, which is another topic. Please refer
sweep : Parameter sweep utility - Lumerical Support
optimization: Optimization utility - Lumerical Support
Please write a new post at the Photonics Forum
Photonics ÔÇö Ansys Learning Forum
if you have questions.