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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 6 — Jun. 17, 2008

Measurement of the enhanced evanescent fields of integrated waveguides for optical near-field sensing

Julia Hahn, Christian E. Rüter, Frank Fecher, Jürgen Petter, Detlef Kip, and Theo Tschudi  »View Author Affiliations


Applied Optics, Vol. 47, Issue 13, pp. 2357-2360 (2008)
http://dx.doi.org/10.1364/AO.47.002357


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Abstract

The sensitivity of an integrated optical sensing device can be enhanced by coating it with a high refractive index layer, while both incoupled intensity and spatial resolution are maintained. The potential for enhanced sensing is demonstrated using titanium indiffused waveguiding structures in LiNbO 3 coated with a TiO 2 film. To the best of our knowledge, it could be measured for the first time that the outcoupled intensity at the surface was enhanced by a factor of 12–15 while keeping the penetration depth of the evanescent field constant of the order of only a few tens of nanometers. The evanescent fields of the guided modes were measured and characterized with a scanning near-field optical microscope and are in accordance with the numerical simulations.

© 2008 Optical Society of America

OCIS Codes
(130.3730) Integrated optics : Lithium niobate
(230.3120) Optical devices : Integrated optics devices
(310.2785) Thin films : Guided wave applications
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Integrated Optics

History
Original Manuscript: January 3, 2008
Revised Manuscript: April 2, 2008
Manuscript Accepted: April 4, 2008
Published: April 28, 2008

Virtual Issues
Vol. 3, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Julia Hahn, Christian E. Rüter, Frank Fecher, Jürgen Petter, Detlef Kip, and Theo Tschudi, "Measurement of the enhanced evanescent fields of integrated waveguides for optical near-field sensing," Appl. Opt. 47, 2357-2360 (2008)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-47-13-2357


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