An analytic formula for the light field amplitude (and therefore also intensity) behind a circular aperture illuminated by spherical or plane waves in the Fresnel limit is given, and the essential difference between Fresnel diffraction and Fraunhofer diffraction is discussed.
© 1998 Optical Society of America
Original Manuscript: June 17, 1997
Revised Manuscript: October 2, 1997
Manuscript Accepted: October 6, 1997
Published: March 1, 1998
Peng Wang, Yuguang Xu, Wei Wang, and Zhijian Wang, "Analytic expression for Fresnel diffraction," J. Opt. Soc. Am. A 15, 684-688 (1998)