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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 5 — Mar. 5, 2007
  • pp: 2307–2314

Fabrication and testing of planar chalcogenide waveguide integrated microfluidic sensor

Juejun Hu, Vladimir Tarasov, Anu Agarwal, Lionel Kimerling, Nathan Carlie, Laeticia Petit, and Kathleen Richardson  »View Author Affiliations


Optics Express, Vol. 15, Issue 5, pp. 2307-2314 (2007)
http://dx.doi.org/10.1364/OE.15.002307


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Abstract

We have fabricated and tested, to the best of our knowledge, the first microfluidic device monolithically integrated with planar chalcogenide glass waveguides on a silicon substrate. High-quality Ge23Sb7S70 glass films have been deposited onto oxide coated silicon wafers using thermal evaporation, and high-index-contrast channel waveguides have been defined using SF6 plasma etching. Microfluidic channel patterning in photocurable resin (SU8) and channel sealing by a polydimethylsiloxane (PDMS) cover completed the device fabrication. The chalcogenide waveguides yield a transmission loss of 2.3 dB/cm at 1550 nm. We show in this letter that using this device, N-methylaniline can be detected using its well-defined absorption fingerprint of the N-H bond near 1496 nm. Our measurements indicate linear response of the sensor to varying N-methylaniline concentrations. From our experiments, a sensitivity of this sensor down to a N-methylaniline concentration 0.7 vol. % is expected. Given the low-cost fabrication process used, and robust device configuration, our integration scheme provides a promising device platform for chemical sensing applications.

© 2007 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(230.7390) Optical devices : Waveguides, planar
(300.1030) Spectroscopy : Absorption

ToC Category:
Integrated Optics

History
Original Manuscript: January 4, 2007
Revised Manuscript: February 5, 2007
Manuscript Accepted: February 19, 2007
Published: March 5, 2007

Virtual Issues
Vol. 2, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Juejun Hu, Vladimir Tarasov, Anu Agarwal, Lionel Kimerling, Nathan Carlie, Laeticia Petit, and Kathleen Richardson, "Fabrication and testing of planar chalcogenide waveguide integrated microfluidic sensor," Opt. Express 15, 2307-2314 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-5-2307


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