Diffraction-free beams in thin films

Details Diffraction-free beams in thin films Diffraction-free beams in thin films

2009-10-29

arxiv.org/abs/0910.5642v1

Physics

Optics

Scientific paper

The propagation and transmission of Bessel beams through nano-layered structures has been discussed recently. Within this framework we recognize the formation of unguided diffraction-free waves with the spot size approaching and occasionally surpassing the limit of a wavelength when a Bessel beam of any order n is launched onto a thin material slab with grazing incidence. Based on the plane-wave representation of cylindrical waves, a simple model is introduced providing an exact prescription of the transverse pattern of this type of diffraction-suppressed localized waves. Potential applications in surface science are put forward for consideration.

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