Zemax implements microlens array beam shaping (principle + simulation)

 Fundamental:

ØMicro lens

• Dimensions range from microns to hundreds of microns

• Capable of refraction, reflection and diffraction

• Its small size, light weight and flexible design

ØMicrolens array : an optical integrated component with many microlens permutations and combinations .

Beam shaping is realized by dividing the light into many small areas of the light source, and then focusing on an area of ​​the same size through the focusing lens, as shown in Figure 1 and Figure 2.

figure 1

figure 2 

Analytical method:

        First, ray tracing method (geometric optics)

        Second, Fourier analysis method (diffraction optics)

 Zemax simulation:

Note: Here the microlens array is mainly used in the lighting system. The microlens array is composed of multiple microlens elements. Therefore, the establishment of the structure is established and simulated in the non-sequential module of Zemax.

Step 1: Establish the basic structure of the system (including: light source, lens element, detector)

        ------------Here mainly introduces the establishment of the lens array, and the previous notes about the light source----------

Because it is a lens array, the most direct way is to select [Lens Array] in [Object Type], and then set the position and material of the lens array, the size of the "lens element" and the curvature of the surface, etc., and finally according to the actual situation Set the number of lens elements in the X and Y directions, and you are done. (Other parameters, as the case may be!)

Then you need to set up a [focusing lens] to focus the light emitted by each lens element into the same area.

 

 Figure 3 Structure parameter table

Notice:

        1. The number of light rays of the light source should be sufficient

        2. The position and resolution of the detector also need to be appropriate to avoid problems caused by too little or too much data for simulation.

Step 2: The detector performs ray tracing (for each simulation, generally click "clear and trace")

Figure 4 Ray tracing

Step 4: View the result

Figure 5 (a) Gaussian light source

Figure 5(b) Light field near the back focal plane of the microlens

 Figure 5(c) Light field near the back focal plane of the focusing lens

 Finally, the microlens beam shaping under the basic structure is implemented here. For this structure, many parameters can also be optimized, for example: modifying the parameters of the microlens, structure type, coating and other parameters; you can also add two microlenses Lens arrays; beam shaping effects can also be analyzed when the microlenses are tilted or the lens elements are different.

For specific documents, see:  Zemax Realizes Microlens Array Beam Shaping - Machine Learning Documentation Resources - CSDN Library