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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 16 — Jun. 1, 2006
  • pp: 3760–3767

Applications of quantum dots in optical fiber luminescent oxygen sensors

Pedro A. S. Jorge, Mona Mayeh, Ramazan Benrashid, Paulo Caldas, José L. Santos, and Faramarz Farahi  »View Author Affiliations


Applied Optics, Vol. 45, Issue 16, pp. 3760-3767 (2006)
http://dx.doi.org/10.1364/AO.45.003760


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Abstract

The potential applications of luminescent semiconductor nanocrystals to optical oxygen sensing are explored. The suitability of quantum dots to provide a reference signal in luminescence-based chemical sensors is addressed. A CdSe–ZnS nanocrystal, with an emission peak at 520   nm , is used to provide a reference signal. Measurements of oxygen concentration, which are based on the dynamic quenching of the luminescence of a ruthenium complex, are performed. Both the dye and the nanocrystal are immobilized in a solgel matrix and are excited by a blue LED. Experimental results show that the ratio between the reference and the sensor signals is highly insensitive to fluctuations of the excitation optical power. The use of CdTe, near-infrared quantum dots with an emission wavelength of 680   nm , in combination with a ruthenium complex to provide a new mechanism for oxygen sensing, is investigated. The possibility of creating oxygen sensitivity in different spectral regions is demonstrated. The results obtained clearly show that this technique can be applied to develop a wavelength division multiplexed system of oxygen sensors.

© 2006 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(300.0300) Spectroscopy : Spectroscopy
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

History
Original Manuscript: September 6, 2005
Manuscript Accepted: October 21, 2005

Citation
Pedro A. S. Jorge, Mona Mayeh, Ramazan Benrashid, Paulo Caldas, José L. Santos, and Faramarz Farahi, "Applications of quantum dots in optical fiber luminescent oxygen sensors," Appl. Opt. 45, 3760-3767 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-16-3760


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