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Refractometric sensing with fluorescent-core microcapillaries

  • Author / Creator
    Manchee, Kyle
  • A capillary-type fluorescent-core microcavity refractive index sensor based on whispering gallery mode (WGM) resonances is presented. The device consists of a glass microcapillary with a thin layer of fluorescent silicon quantum dots (QDs) coated on the channel surface. The high index of the QD layer confines the electric field near the capillary channel and causes the development of WGMs in the fluorescence spectrum. Refractometric sensing was achieved in these fluorescent-core microcapillaries (FCMs) by pumping aqueous sucrose solutions through the capillary while measuring the fluorescence WGMs with a spectrometer. A finite-difference frequency-domain model was developed and used to study the performance of the FCMs. While the observed refractometric sensitivity and detection limit of the current device were inferior to competing technologies, FCMs offer other practical advantages, such as straight-forward fabrication, robust samples, and minimal instrumental requirements, all of which make FCMs an appealing technology for integration with lab-on-a-chip devices.

  • Subjects / Keywords
  • Graduation date
    2011-11
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/R34Q6M
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Master's
  • Department
    • Department of Physics
  • Supervisor / co-supervisor and their department(s)
    • Meldrum, Al (Physics)
  • Examining committee members and their departments
    • Freeman, Mark (Physics)
    • Veinot, Jonathan (Chemistry)
    • DeCorby, Ray (Electrical and Computer Engineering)