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Wide-window angular spectrum method for diffraction propagation in far and near field |
Optics Letters, Vol. 37, Issue 23, pp. 4943-4945 (2012)
http://dx.doi.org/10.1364/OL.37.004943
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Abstract
A novel method is proposed for simulating free-space diffraction propagation. This method is an improvement of the angular spectrum (AS) method and the band-limited angular spectrum (BLAS) method. Due to the sampling problem about the transfer function, AS is not suited for the long-distance propagation. For BLAS, the calculation accuracy would decrease when the propagation distance is relatively large. Using a wide calculation window can largely reduce the numerical error of AS and BLAS. However, a wide calculation window generally causes a huge calculation burden in the simulation. For the proposed method, the calculation window size is chosen to make sure all the sampling points in the frequency domain are effective in the sense of Nyquist theorem. The calculation complexity is independent of the calculation window size because of the use of the linear convolution. The linear convolution can be evaluated effectively by fast Fourier transform. This method can produce simulation results with high accuracy for far and near field propagation.
© 2012 Optical Society of America
OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(090.1970) Holography : Diffractive optics
(070.7345) Fourier optics and signal processing : Wave propagation
ToC Category:
Diffraction and Gratings
History
Original Manuscript: September 11, 2012
Manuscript Accepted: October 22, 2012
Published: November 28, 2012
Citation
Xiao Yu, Tang Xiahui, Qin Ying xiong, Peng Hao, and Wang Wei, "Wide-window angular spectrum method for diffraction propagation in far and near field," Opt. Lett. 37, 4943-4945 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-23-4943
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