Diffraction by extremely small holes in thin absorbing and transparent screens and by disks

摘要

The generalization of Bethe-Bouwkamp diffraction theory for the case of diffraction by the hole in absorbing and transparent thin screens and by the disks is proposed. Duality transformation of Bethe-Bouwkamp solution is implemented. The approximate analytical expressions are found for the near electromagnetic diffraction field for extremely small hole or disk.