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Fast-Fourier-transform based numerical integration method for the Rayleigh-Sommerfeld diffraction formula

2006; Optica Publishing Group; Volume: 45; Issue: 6 Linguagem: Inglês

10.1364/ao.45.001102

0003-6935

Fabin Shen, Anbo Wang,

Electromagnetic Simulation and Numerical Methods

The numerical calculation of the Rayleigh-Sommerfeld diffraction integral is investigated. The implementation of a fast-Fourier-transform (FFT) based direct integration (FFT-DI) method is presented, and Simpson's rule is used to improve the calculation accuracy. The sampling interval, the size of the computation window, and their influence on numerical accuracy and on computational complexity are discussed for the FFT-DI and the FFT-based angular spectrum (FFT-AS) methods. The performance of the FFT-DI method is verified by numerical simulation and compared with that of the FFT-AS method.