Proceedings PaperValidity of the scalar Kirchhoff and Rayleigh-Sommerfeld diffraction theories in the near-field of small phase objects of finite thickness
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The properties of complex systems of integrated optics depend mainly on the nearfields of the components, if their distances are less than a few wavelengths. For field-calculations the Kirchhoff and the Rayleigh-Sommerfeld diffraction theories may be applied also to phase objects. Usually these are assumed to be "thin" ; then in the "object plane" the incident wave may be multiplied with the complex object transmittance (Kirchhoff's boundary conditions). But, in general, this approximation leads to deviations; these are investigated for small phase objects (n-i << 1, Ac < 20°) of finite thickness.