Analysis and design of a microlens array scanning system based on spherical aberration

Area of Science:

• Optics and Photonics
• Optical Engineering
• Beam Scanning Technologies

Background:

• Microlens arrays (MLAs) offer a novel approach to beam scanning applications.
• A key challenge in MLA systems is the generation of excrescent light due to overlapping beams from adjacent microlenses.
• This excrescent light increases with the scanning angle, leading to incomplete filling of the MLA's clear aperture.

Purpose of the Study:

• To analyze the impact of excrescent light on the detection distance and imaging resolution of MLA scanning systems.
• To propose an initial configuration design method for MLA systems based on minimizing spherical aberration.
• To provide insights beneficial for the design and evaluation of MLA-based optical systems.

Main Methods:

• Analysis of optical path and light distribution within the MLA system at varying scanning angles.
• Investigation of the relationship between scanning angle, excrescent light, and clear aperture utilization.
• Development of a design methodology rooted in the principle of minimum spherical aberration for MLA initial setup.

Main Results:

• Quantification of how excrescent light affects detection distance and imaging resolution in MLA systems.
• Demonstration of a design method for optimizing the initial configuration of MLA systems.
• Identification of design parameters crucial for mitigating performance degradation at larger scanning angles.

Conclusions:

• The study provides a foundational understanding of MLA scanning system limitations related to excrescent light.
• The proposed design method offers a practical approach to enhance MLA system performance.
• Findings are valuable for researchers and engineers involved in the development and assessment of MLA technologies.