Liquid core modal interferometer integrated with silica waveguides

An integrated structure is demonstrated as a refractive index sensor. The structure consists of a liquid-filled elliptical microchannel embedded in silica glass and integrated with waveguides. The microchannel features entry points that are open to the top surface of the device and distinct from the...

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Bibliographic Details
Published in:IEEE photonics technology letters 2006-03, Vol.18 (6), p.746-748
Main Authors: Dumais, P., Callender, C.L., Noad, J.P., Ledderhof, C.J.
Format: Article
Language:English
Subjects:
Integrated optics
Liquid waveguides
Liquids
Microchannel
Microchannels
Microsensors
Optical data processing
Optical interferometry
optical planar waveguide components
Optical refraction
Optical sensors
optical transducers
Optical variables control
Optical waveguides
Refractive index
Refractivity
Silica glass
Silicon compounds
Silicon dioxide
Waveguides
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Summary:An integrated structure is demonstrated as a refractive index sensor. The structure consists of a liquid-filled elliptical microchannel embedded in silica glass and integrated with waveguides. The microchannel features entry points that are open to the top surface of the device and distinct from the optical input. The structure allows light to couple from a solid-core input waveguide to the liquid-core waveguide formed by the microchannel, and back to a solid-core output waveguide. Bimodal interference allows the structure to be sensitive to the refractive index of the liquid, with a full beat corresponding to a refractive index change of /spl sim/10/sup -4/. The structure allows the direct integration of optical fluids with silica waveguides for sensing and optical processing applications.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2006.871109