Study on diffraction patterns of 2D colloidal crystals and substrate deformation
A polystyrene microsphere array self-assembled on a flexible substrate was taken as the research object,a building-block-like device was designed to demonstrate the arrangement related dif-fraction patterns and measure the deformation of its substrate by using theories of the optical diffrac-tion method and crystal structures.The device could realize showing intuitively the relationship be-tween the arrangement of microspheres and the diffraction patterns,and also realized the knowledge transition from macroscopic diffraction patterns to microscopic lattice structures.And the deformation of its substrate could be estimated according to period,the experimental results were in good agree-ment with the theoretical predictions.The device had the advantages of visualization,high measure-ment accuracy,and easy operation.It could be the extension for the undergraduate experiment teach-ing.
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