Search for: [Abstrakt = "We analyze optical diffraction of a micro\-aperture \(slit or hole\) in a metal screen in the intermediate zone and report its application for beam focusing and collimating in micro\-optics. Both finite\-difference time\-domain simulations and Rayleigh–Sommerfeld diffraction formula were applied to calculate the intermediate\-zone diffraction patterns. It is shown that, by controlling the aperture size, the focal length and depth can be adjusted in a very wide range, from subwavelength to tens of wavelengths, while the focal width maintains in an order of wavelength."]

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