This 2D example shows how to calculate the angular response of an image sensor array. The angular response measures the optical efficiency of the device as a function of incidence angle. This result can be compared to an experimental setup and it can also be used to calculate the optical efficiency under uniform illumination as described in Simulation methodology.
The following figure shows the experimental setup being simulated. A laser beam illuminates the image sensor at some angle. We measure the fraction of power absorbed in the depletion region as a function of incidence angle. Two simulations (TE and TM) are required at each angle to get the efficiency for both polarizations and for un-polarized light.