Research On Microlens Arrangement And Crosstalk Suppression Of Double Layer Array Scanning Imaging System

Beam scanning technology has been increasingly widely used in various fields of life,so beam scanning imaging systems have gradually become a research hotspot.Among many methods that can achieve scanning imaging,microlens arrays,as a form of beam scanning methods,can achieve scanning imaging through the principle of relative displacement caused by double layer microlens arrays,so that the beam is incident periodically to a certain extent.In the process of scanning imaging using a microlens array system,due to the inherent characteristics and dynamic scanning form of microlenses,the diffraction effect and beam crosstalk cannot be ignored.Therefore,we conduct specific research based on the above issues in this paper.Due to the small unit size of microlens arrays,diffraction phenomena are particularly prominent in microlens array scanning imaging systems,and their impact on imaging cannot be ignored.Firstly,based on scalar diffraction theory,we construct computational models for subaperture diffraction with several typical shapes.Secondly,combining diffraction and Fourier array theory,the effects of aperture shape and array layout on the aperture plane are analyzed from the perspective of the fill factor.The expressions for the complex amplitude distribution and image plane light intensity distribution of the microlens array system are derived.The comprehensive effects of the fill factor and diffraction on the microlens array imaging system are discussed.Thirdly,the relationship between the microlens parameters and the aperture shape and array layout is derived and analyzed,and the influence of diffraction effect on the modulation transfer function of the array scanning imaging system is discussed.Finally,the diffraction effects of aperture shape and array distribution are simulated and analyzed using Virtual Lab software,which validates the constructed calculation model and proposed calculation method.Combining the comprehensive impact of fill factor and diffraction on the microlens array imaging system,and taking the impact of fill factor and diffraction effect as the comprehensive evaluation objective,the parameters and layout of the microlens array are optimized,providing a theoretical basis for the design of the microlens array scanning imaging system.At the same time,double layer microlenses require lateral displacement to achieve rapid beam scanning,so it is inevitable to generate crosstalk between adjacent sublenses during dynamic scanning.The crosstalk beam will overlap with the normal imaging beam,seriously affecting the imaging quality of the system.Therefore,we first analyze the generation mechanism of crosstalk in the microlens array scanning system.In order to suppress crosstalk beams in a double layer microlens array scanning system,a method of suppressing crosstalk with a multilayer stop array is proposed based on geometric optical tracing method and the blocking effect of the stop on crosstalk beams.This method achieves the blocking and suppression of crosstalk stray light during dynamic scanning.Taking a specific double layer microlens array scanning system as an example,the crosstalk phenomenon and suppression process of the system are simulated using FRED software,and the impact and suppression of crosstalk on the imaging quality of the system are intuitively analyzed and discussed.Through simulation and comparative analysis,it is found that after adding multilayers crosstalk suppression stop arrays,the crosstalk of the double layer microlens array is effectively suppressed.Combined with subsequent imaging systems,further simulation analysis is conducted.The results show that the scanning imaging system composed of a microlens array and an imaging system achieves very good suppression of crosstalk beams.Finally,an experimental platform for a double layer microlens array scanning system is built,and the correctness of the proposed crosstalk suppression method is verified by comparing the imaging experimental results before and after the placement of the crosstalk suppression stop array.Starting from the fill factor and diffraction effect,the research content of this dissertation provides reference evaluation criteria for optimal microlens array parameters and array layout optimization to achieve high-quality imaging optimization of double layer microlens array systems.Aiming at the problem of beam crosstalk generated during dynamic scanning,a crosstalk suppression method for multilayer stop arrays is proposed to solve the problem of crosstalk stray light in double layer microlens array imaging optical systems.It provides theoretical support for the diffraction effect and crosstalk beam control applications of microlens arrays during dynamic scanning,and has certain theoretical significance and application value for solving some cutting-edge issues in the field of micro optics.