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Beam shaping based on intermediate zone diffraction of a micro-aperture

Author(s): Danyan Zeng | Zhijun Sun

Journal: Optica Applicata
ISSN 0078-5466

Volume: 38;
Issue: 3;
Start page: 511;
Date: 2008;
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Keywords: aperture | diffraction | beam shaping

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.

Tango Jona
Tangokurs Rapperswil-Jona

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