Spatial distribution analysis of two-dimensional microlens arrays by finite element method

A microlens array is a junction of small-sized lenses distributed one-with-other for decreasing the sizes in some sensors or CCD for applications where portability is mandatory. However, working with circular apertures reduces the arrangement efficiency due to the distance between each element. Using several parameters, as spatial distributions, optical apertures, and materials for the microlenses, prevents the light incidence on non-photosensitive areas due to diffraction. The study of these parameters employing the finite element method (FEM) is a complementary tool to arrangement optimization. We present an investigation based on FEM for microlens arrays optimization in two dimensions, where the arrangement, geometry, and materials for the array are changed. The analysis can be useful to estimate the incidence on a non-photosensitive surface due to diffraction of any aperture geometry, or lens material, knowing the focal length and the wavefront transmitted, as the previous step to the final elaboration.