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Applied Physics Letters / Volume 99 / Issue 14 / LASERS, OPTICS, AND OPTOELECTRONICS
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Appl. Phys. Lett. 99, 141111 (2011); http://dx.doi.org/10.1063/1.3648109 (3 pages)

Highly efficient excitation and detection of whispering gallery modes in a dye-doped microsphere using a microstructured optical fiber

Alexandre François, Kristopher J. Rowland, and Tanya M. Monro

The Institute for Photonics & Advanced Sensing, The University of Adelaide, Adelaide, South Australia 5005, Australia

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(Received 3 July 2011; accepted 10 September 2011; published online 6 October 2011)

A technique for the excitation of whispering gallery modes (WGMs) has been demonstrated using a dye-doped microsphere positioned onto the tip of a suspended core microstructured optical fiber. With this configuration, we have shown that both the excitation and collection efficiency of the WGMs modulated fluorescence spectra of the dye are greatly improved compared to a more conventional excitation scheme; an overall efficiency increase by a factor of 200 is demonstrated. It is also shown that positioning the resonator onto the fiber tip does not impact its sensitivity, providing a compact and robust architecture for applications such as localized in-vivo/vitro biosensing.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

dyes, fibre optic sensors, fluorescence, holey fibres, optical resonators, whispering gallery modes

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3648109

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
(Color online) (a) WGMs excitation and collection optical setup. Optical microscope images of a wagon wheel MOF without (b) and with (c) a single 10 μm dye doped polystyrene sphere deposited on the fiber tip. (d) Optical losses measurement of the MOF used.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
WGMs spectrum of a single microsphere under different excitation and collection schemes (a) microscope excitation and collection, (b) MOF excitation/microscope collection, (c) microscope excitation/MOF collection, and (d) MOF excitation/MOF collection.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(a) WGMs spectra of a single microsphere (Ø ∼ 10.54 μm) attached to a glass slide within a microfluidic flow cell surrounded with solutions of increasing glycerol concentration. (b) WGMs spectra of a single microsphere (Ø ∼ 9.91 μm) attached to a MOF tip and dipped in solutions of increasing glycerol concentration (bottom to top: DI water, 0.78125%, 1.5625%, 3.125%, 6.25%, 12.5%, 25%).

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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