Precise mathematical description of the diffraction pattern beyond a square aperture in an absorbing medium

Christel de Jong

doi:10.1117/12.55846

1 May 1991 Precise mathematical description of the diffraction pattern beyond a square aperture in an absorbing medium

Christel de Jong

Author Affiliations +

Optical Engineering, Vol. 30, Issue 5, (May 1991). https://doi.org/10.1117/12.55846

Abstract

A precise expression for the diffraction pattern from a square aperture is derived. The field at the aperture is assumed to be a plane wavefront of constant intensity. The parameters involved are the wavelength λ of the incident light, the distance z_c between the aperture and the plane of interest, the dimension D of the square aperture, and the absorption coefficient a of the medium. The presented model is valid for all values of these parameters. It is also applicable to situations in which the Fresnel approximation does not provide an accurate solution anymore. It turns out that the intensity distribution is determined solely by the values of two dimensionless numbers: D²/(λz_c) and λ/z_c. Computational results are given for 200 nm ≤ λ ≤ 600 nm; 10^-3 μm ≤ z_c ≤ 100 μm; and 1 μm ≤ D ≤ 100 μm.

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Christel de Jong "Precise mathematical description of the diffraction pattern beyond a square aperture in an absorbing medium," Optical Engineering 30(5), (1 May 1991). https://doi.org/10.1117/12.55846

Published: 1 May 1991

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