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Type: Journal article
Title: Fluorescent polymer coated capillaries as optofluidic refractometric sensors
Author: Rowland, K.
François, A.
Hoffmann, P.
Monro, T.
Citation: Optics Express, 2013; 21(9):11492-11505
Publisher: Optical Soc Amer
Issue Date: 2013
ISSN: 1094-4087
Statement of
Kristopher J. Rowland, Alexandre François, Peter Hoffmann, and Tanya M. Monro
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.
Keywords: Polymers
Spectrometry, Fluorescence
Equipment Design
Equipment Failure Analysis
Micro-Electrical-Mechanical Systems
Capillary Action
Rights: © 2013 OSA
DOI: 10.1364/OE.21.011492
Appears in Collections:Aurora harvest
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