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Then the Chern quantity is gotten by calculating the integral of Berry curvature on the first Brillouin zone. Numerical examples of both transverse-electric (TE) and transverse-magnetic (TM) settings tend to be shown, where convergent Chern numbers can be acquired making use of instead coarse grids, hence validating the efficiency and precision associated with the recommended method.Design and optimization of lensless phase-retrieval optical system with period modulatio