Optical waveguide focusing system with short free-working distance

Haifeing Wang, M. R.; Groen, F. H.; Pereira, S. F.; Braat, J. J. M.
December 2003
Applied Physics Letters;12/1/2003, Vol. 83 Issue 22, p4486
Academic Journal
In photonics, light usually diffracts in all directions when it emerges from a planar optical waveguide. Besides this fact, in this letter we show that a waveguide with a rectangular cross section can be turned to a focusing system by using three-dimensional self-imaging technique. We obtained a configuration where the focus of the field lies outside the waveguide, in air, with a spot size of approximately the resolution limit of half a wavelength. This type of waveguide could be used as a coupling element in integrated optics or in high numerical aperture optical systems. © 2003 American Institute of Physics.


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