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Optics Letters

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  • Vol. 27, Iss. 9 — May. 1, 2002
  • pp: 689–691

Prism-coupled multimode waveguide refractometer

Zhi-Mei Qi, Naoki Matsuda, Jose H. Santos, Akiko Takatsu, and Kenji Kato  »View Author Affiliations


Optics Letters, Vol. 27, Issue 9, pp. 689-691 (2002)
http://dx.doi.org/10.1364/OL.27.000689


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Abstract

A new refractometer has been developed based on changes in the effective refractive index (RI) of the highest-order TE (or TM) mode in a prism-coupled multimode planar waveguide induced by interaction between an evanescent field and a liquid sample. The waveguide was a 100-mu;m -thick quartz plate fixed on a poly(methyl methacrylate) support containing a flow cell. A pair of prism couplers contacted the quartz plate in the flow-cell region. Such an optical sensor can detect the RI of liquid in a wide range by monitoring the resonant angle of the highest-order mode that changes order number with changes in the sample's RI. When a highest-order mode corresponding to a given RI range is used as the sensor probe, a slight RI change in this range can be detected by measurement of the output light intensity. With this method the sensor was demonstrated to have a resolution of 3×10-5 for the RI of an aqueous solution. Combining this result with theoretical calculation indicates that the sensor can detect a 0.5-nm-thick monolayer adsorbed from an aqueous solution. Therefore, the sensor is suitable for real-time detection of biomolecular interactions.

© 2002 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(160.2750) Materials : Glass and other amorphous materials
(220.4830) Optical design and fabrication : Systems design
(230.7400) Optical devices : Waveguides, slab
(240.6700) Optics at surfaces : Surfaces
(290.3030) Scattering : Index measurements

Citation
Zhi-Mei Qi, Naoki Matsuda, Jose H. Santos, Akiko Takatsu, and Kenji Kato, "Prism-coupled multimode waveguide refractometer," Opt. Lett. 27, 689-691 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-9-689


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References

  1. W. Lukosz, Sens. Actuators B 29, 37 (1995).
  2. Z.-M. Qi, K. Itoh, M. Murabayashi, and H. Yanagi, J. Lightwave Technol. 18, 1106 (2000).
  3. K. Kato, A. Takatsu, and N. Matsuda, Chem. Lett. 1999, 31.
  4. A. Klotz, C. Barzen, A. Brecht, R. D. Harris, G. R. Quigley, J. S. Wilkinson, and G. Gauglitz, Proc. SPIE 3620, 345 (1999).

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