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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 26, Iss. 9 — May. 1, 2001
  • pp: 629–631

Composite optical waveguide composed of a tapered film of bromothymol blue evaporated onto a potassium ion–exchanged waveguide and its application as a guided wave absorption–based ammonia-gas sensor

Zhi-mei Qi, Abliz Yimit, Kiminori Itoh, Masayuki Murabayashi, Naoki Matsuda, Akiko Takatsu, and Kenji Kato  »View Author Affiliations


Optics Letters, Vol. 26, Issue 9, pp. 629-631 (2001)
http://dx.doi.org/10.1364/OL.26.000629


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Abstract

For what is the first time to our knowledge, we have successfully evaporated a tapered film of bromothymol blue (BTB) onto a potassium ion–exchanged (PIE) waveguide to form a composite optical waveguide (COWG) for trace-ammonia detection. The BTB film has a high refractive index (1.69) and a smooth surface and is transparent to a 633-nm laser beam in air. In the COWG structure, the BTB film serves as a single-mode waveguide, and adiabatic transition of the TE<sub>0</sub> mode was realized between the BTB waveguide and the PIE waveguide with both BTB tapers. In the presence of ammonia, the BTB film changes color from yellow to blue, which causes absorption of the 633-nm guided wave. Our experimental results demonstrate that such a guided wave absorption–based ammonia-gas sensor is much more sensitive than one based on evanescent-wave absorption. A detection limit of part in 10<sup>9</sup> of ammonia has been realized for a BTB film–PIE glass COWG.

© 2001 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(230.7390) Optical devices : Waveguides, planar
(280.1120) Remote sensing and sensors : Air pollution monitoring
(310.1860) Thin films : Deposition and fabrication
(310.6860) Thin films : Thin films, optical properties
(330.1730) Vision, color, and visual optics : Colorimetry

Citation
Zhi-mei Qi, Abliz Yimit, Kiminori Itoh, Masayuki Murabayashi, Naoki Matsuda, Akiko Takatsu, and Kenji Kato, "Composite optical waveguide composed of a tapered film of bromothymol blue evaporated onto a potassium ion–exchanged waveguide and its application as a guided wave absorption–based ammonia-gas sensor," Opt. Lett. 26, 629-631 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-9-629

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