Optical waveguide focusing system with short free-working distance

Haifeng Wang, F.H. Groen, S.F. Pereira, J.J.M. Braat

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
156 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)4486-4487
Number of pages2
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 2003


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