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학술지 Non-Uniform Sampling and Wide Range Angular Spectrum Method
Cited 15 time in scopus Download 3 time Share share facebook twitter linkedin kakaostory
저자
김용해, 변춘원, 오힘찬, 이재원, 피재은, 김기현, 이명래, 류호준, 추혜용, 황치선
발행일
201412
출처
Journal of Optics, v.16 no.12, pp.1-9
ISSN
2040-8978
출판사
Institute of Physics (IOP)
DOI
https://dx.doi.org/10.1088/2040-8978/16/12/125710
협약과제
14MR8100, 디지털 홀로그래픽 테이블탑형 단말 기술 개발, 김진웅
초록
A novel method is proposed for simulating free space field propagation from a source plane to a destination plane that is applicable for both small and large propagation distances. The angular spectrum method (ASM) was widely used for simulating near field propagation, but it caused a numerical error when the propagation distance was large because of aliasing due to under sampling. Band limited ASM satisfied the Nyquist condition on sampling by limiting a bandwidth of a propagation field to avoid an aliasing error so that it could extend the applicable propagation distance of the ASM. However, the band limited ASM also made an error due to the decrease of an effective sampling number in a Fourier space when the propagation distance was large. In the proposed wide range ASM, we use a non-uniform sampling in a Fourier space to keep a constant effective sampling number even though the propagation distance is large. As a result, the wide range ASM can produce simulation results with high accuracy for both far and near field propagation. For non-paraxial wave propagation, we applied the wide range ASM to a shifted destination plane as well.
키워드
Computer holography, Fourier optics, Signal processing
KSP 제안 키워드
Aliasing error, Angular spectrum, Computer holography, Fourier optics, Fourier space, Free Space, High accuracy, Non-paraxial, Non-uniform sampling, Numerical error, Sampling number