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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 21723–21731

Diffractionless beam in free space with adiabatic changing refractive index in a single mode tapered slab waveguide

Chang-Ching Tsai, Claudio Vinegoni, and Ralph Weissleder  »View Author Affiliations


Optics Express, Vol. 17, Issue 24, pp. 21723-21731 (2009)
http://dx.doi.org/10.1364/OE.17.021723


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Abstract

We propose a novel design to produce a free space diffractionless beam by adiabatically reducing the difference of the refractive index between the core and the cladding regions of a single mode tapered slab waveguide. To ensure only one propagating eigenmode in the adiabatic transition, the correlation of the waveguide core width and the refractive index is investigated. Under the adiabatic condition, we demonstrate that our waveguide can emit a diffractionless beam in free space up to 500 micrometers maintaining 72% of its original peak intensity. The proposed waveguide could find excellent applications for imaging purposes where an extended depth of field is required.

© 2009 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(130.0130) Integrated optics : Integrated optics
(230.7400) Optical devices : Waveguides, slab

ToC Category:
Optical Devices

History
Original Manuscript: July 22, 2009
Revised Manuscript: October 7, 2009
Manuscript Accepted: October 12, 2009
Published: November 12, 2009

Citation
Chang-Ching Tsai, Claudio Vinegoni, and Ralph Weissleder, "Diffractionless beam in free space with adiabatic changing refractive index in a single mode tapered slab waveguide," Opt. Express 17, 21723-21731 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-24-21723


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