Characterization of supported cylinder-planar germanium waveguide sensors with synchrotron Infrared radiation

Vongsvivut, Jitraporn, Fernandez, Jason, Ekgasit, Sanong and Braiman, Mark S. 2004, Characterization of supported cylinder-planar germanium waveguide sensors with synchrotron Infrared radiation, Applied spectroscopy, vol. 58, no. 2, pp. 143-151.

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Title Characterization of supported cylinder-planar germanium waveguide sensors with synchrotron Infrared radiation
Author(s) Vongsvivut, Jitraporn
Fernandez, Jason
Ekgasit, Sanong
Braiman, Mark S.
Journal name Applied spectroscopy
Volume number 58
Issue number 2
Start page 143
End page 151
Total pages 9
Publisher Society for Applied Spectroscopy
Place of publication Frederick, Md.
Publication date 2004-02
ISSN 0003-7028
1943-3530
Keyword(s) tapered waveguides
evanescent wave absorption spectroscopy
synchrotron IR radiation
blackbody IR source
throughput
Summary Cylinder-planar Ge waveguides are being developed as evanescent-wave sensors for chemical microanalysis. The only non-planar surface is a cylinder section having a 300-mm radius of curvature. This confers a symmetric taper, allowing for direct coupling into and out of the waveguide's 1-mm2 end faces while obtaining multiple reflections at the central <30-μm-thick sensing region. Ray-optic calculations indicate that the propagation angle at the central minimum has a strong nonlinear dependence on both angle and vertical position of the input ray. This results in rather inefficient coupling of input light into the off-axis modes that are most useful for evanescent-wave absorption spectroscopy. Mode-specific performance of the cylinder-planar waveguides has also been investigated experimentally. As compared to a blackbody source, the much greater brightness of synchrotron-generated infrared (IR) radiation allows a similar total energy throughput, but restricted to a smaller fraction of the allowed waveguide modes. However, such angle-selective excitation results in a strong oscillatory interference pattern in the transmission spectra. These spectral oscillations are the principal technical limitation on using synchrotron radiation to measure evanescent-wave absorption spectra with the thin waveguides.
Language eng
Field of Research 030107 Sensor Technology (Chemical aspects)
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2004, Society for Applied Spectroscopy
Persistent URL http://hdl.handle.net/10536/DRO/DU:30038958

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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