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Optimizing gas sensors based on quantum cascade lasers and photonic bandgap hollow waveguides

 
: Young, C.; Hartwig, S.; Lambrecht, A.; Kim, S.; Mizaikoff, B.

:
Postprint urn:nbn:de:0011-n-691161 (777 KByte PDF)
MD5 Fingerprint: cde7e998ee37ad58810d8465faaed3a3
© 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Erstellt am: 13.7.2010


Mizaikoff, B. ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Sensors 2007, the Sixth IEEE Conference on Sensors : October 28 - 31, 2007, Hyatt Regency Atlanta, Atlanta, Georgia, USA
New York, NY: IEEE, 2007
ISBN: 978-1-4244-1262-4
ISBN: 1-4244-1262-5
S.1345-1348
Conference on Sensors <6, 2007, Atlanta/Ga.>
Englisch
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
FTIR spectroscopy; QCL; hollow waveguides; photonic bandgap waveguides

Abstract
In the present study, bending losses in conventional hollow waveguides (internally Ag/AgI coated) and in photonic bandgap (PBG) hollow waveguides (HWG) are compared based on studies via FT-IR spectroscopy and quantum cascade lasers (QCL). To date, literature on bending losses in hollow waveguides focuses on conventional HWG structures (e.g., silica structural tube with internal Ag/AgI coating), whereas the results discussed here compare relative bending losses in novel photonic bandgap waveguides, a new type of HWG progressively more integrated in gas sensors, versus conventional HWGs for the first time. Photonic bandgap waveguides are expected to exhibit lower polarization dependent relative bending losses due to radiation propagation via omnidirectional reflection, in contrast to conventional HWGs. Accordingly, photonic bandgap waveguides offer superior flexibility and robustness against bending losses in coiled configurations rendering them promising structures for next-generation miniaturized QCL-based HWG gas sensors.

: http://publica.fraunhofer.de/dokumente/N-69116.html