Amplitude and phase in the diffraction near fields of small phase objects (bars with rectangular cross sections ≤λ2) are calculated according to the scalar Kirchhoff and Rayleigh–Sommerfeld diffraction theories. Results are compared with 3-cm microwave measurements. The agreement between calculation and measurement depends on the size of the phase objects because interference fields under certain circumstances will satisfy the Kirchhoff boundary conditions of the different diffraction theories.
© 1991 Optical Society of America
Original Manuscript: April 11, 1990
Manuscript Accepted: August 9, 1990
Published: January 1, 1991
M. Totzeck, "Validity of the scalar Kirchhoff and Rayleigh–Sommerfeld diffraction theories in the near field of small phase objects," J. Opt. Soc. Am. A 8, 27-32 (1991)