Nonuniform sampled angular spectrum method by using trigonometric interpolation

• 来源期刊: 中国物理B（英文版）
• 关键词: wave optics diffraction Fourier optics diffraction efficiency
• 年，卷（期）: 2018,（9）
• 页码范围: 319-324
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/9/094203

摘要

The angular spectrum method(ASM)is a popular numerical approach for scalar diffraction calculations.However,traditional ASM has an inherent problem in that nonuniform sampling is precluded.In an attempt to address this limitation,an improved trigonometric interpolation ASM(TIASM)is proposed,in which the fast Fourier transform(FFT)is replaced by a trigonometric interpolation.The results show that TIASM is more suitable to situations in which the source field has a simple and strong frequency contrast,irrespective of whether the original phase distribution is a plane wave or a Fresnel zone plate phase distribution.