Summary:For the comprehensive characterization of electromagnetic fields, information not only about energy density, but also about phase is of critical value. While in simulations we can compute this information directly from digital data, in a real lab more complex approach is required. A common tool for measuring this information is the Shack Hartmann sensor, which uses a microlens array (MLA) to reconstruct the wavefront of an incident field by the displacement of the corresponding light spot in the focal plane. To investigate this type of device, we demonstrated a simulation of a Shack Hartmann sensor, with different wavefronts as inputs. Mission description
a) Plane wave - wavelength 640 nm - Distance from origin infinity - 2 mm 2 mm diameter (rectangular) b) Oblique plane wave - wavelength 640 nm - 25° Tilt - 2 mm 2 mm diameter (rectangular) c) Weak spherical wave - wavelength 640 nm - distance from origin is 100 mm - 2 mm 2 mm diameter (rectangular) d) Strong spherical wave - wavelength 640 nm- distance from origin is 40 mm - 2 mm 2 mm diameter (rectangular) microlens array- Material: N-BK7- Convex - Convex - Radius of curvature: 5 mm - 200 m 200 m Lens size (rectangular) - 5 5 microlens detectors - Wavefront of the input field - The energy density of the electromagnetic field at the focal surface of the ideal plane waveSystem Component - Component
The microlens array assembly allows for easy definition of arbitrarily shaped microlens arrays. Materials and dimensions are defined via the SOLID tab, while the surface shape of the microlens is configured using a stacking concept and can be accessed via a separate Surface Add-ons tab. This component can be simulated by the entire structure or by individual microlenses. 
System Builders Detectors
Camera Detector calculates the energy density of the electromagnetic field at any point in the system. The electromagnetic field detector calculates pure, complex-valued field data. If the user wishes to see this information, it can also calculate and extract the wavefront of the field. 
Summary - Components. 
ResultsFirst impressions of light and field simulations
Wavefront before MLA
Plane waves. For the sake of space, the full text can be found here**.