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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 9 — May. 6, 2013
  • pp: 11492–11505

Fluorescent polymer coated capillaries as optofluidic refractometric sensors

Kristopher J. Rowland, Alexandre François, Peter Hoffmann, and Tanya M. Monro  »View Author Affiliations


Optics Express, Vol. 21, Issue 9, pp. 11492-11505 (2013)
http://dx.doi.org/10.1364/OE.21.011492


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Abstract

A capillary microresonator platform for refractometric sensing is demonstrated by coating the interior of thick-walled silica capillaries with a sub-wavelength layer of high refractive index, dye-doped polymer. No intermediate processing, such as etching or tapering, of the capillary is required. Side illumination and detection of the polymer layer reveals a fluorescence spectrum that is periodically modulated by whispering gallery mode resonances within the layer. Using a Fourier technique to calculate the spectral resonance shifts, the fabricated capillary resonators exhibited refractometric sensitivities up to approximately 30 nm/RIU upon flowing aqueous glucose through them. These sensors could be readily integrated with existing biological and chemical separation platforms such as capillary electrophoresis and gas chromatography where such thick walled capillaries are routinely used with polymer coatings. A review of the modelling required to calculate whispering gallery eigenmodes of such inverted cylindrical resonators is also presented.

© 2013 OSA

OCIS Codes
(230.5750) Optical devices : Resonators
(140.3948) Lasers and laser optics : Microcavity devices
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Sensors

History
Original Manuscript: February 26, 2013
Revised Manuscript: April 7, 2013
Manuscript Accepted: April 22, 2013
Published: May 3, 2013

Virtual Issues
Vol. 8, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Kristopher J. Rowland, Alexandre François, Peter Hoffmann, and Tanya M. Monro, "Fluorescent polymer coated capillaries as optofluidic refractometric sensors," Opt. Express 21, 11492-11505 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-9-11492


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