Analysis of fill factor and diffraction influence on micro-lens array imaging system

Aiming at the problem of obvious diffraction when light encounters small-diameter components during transmission, we analyze the diffraction effect of micro-lens arrays in this paper. Since the fill factor of the micro-lens array determines the amount of light entering the system, which affects the diffraction effect, and ultimately affects the imaging quality together with the diffraction of the small components, we first use the scalar diffraction theory to analyze and establish the mathematical model of the fill factor of the aperture array and propose a theoretical calculation method. According to this method, different forms of aperture arrays with the same fill factor can be given through geometric relations and system parameters, and then we use an optical analysis software VirtualLab to simulate the diffraction effect. By comparing the light intensity distribution forms and exploring the diffraction effect of the aperture array form on the imaging quality, corresponding conclusions are drawn and a more advantageous structural form is selected.