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13 May 2010 Preparation and characterization of optical microspheres for refractive-index sensing
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The paper deals with the preparation and characterization of whispering-gallery-mode (WGM) microresonators. Three types of materials were used for the preparation of these microresonators, namely silica optical fibers, polydimethylsiloxane polymer and UV-acrylate polymer. In the case of the silica fibers microspheres were prepared by heating the fiber tip with a miniburner or CO2 laser. Polymer microresonators were applied onto tips of fiber substrates when they were dipped into polymer and immediately cured. Microresonators with a diameter ranging from 70 to 1000 μm were prepared. Transmission properties of the prepared microresonators were investigated in experiments where a microresonator was excited by a red laser at 660 nm by using evanescent field of a coupling element, namely a glass or silica fiber prism. The output power from the coupling element was detected. Temporal changes of the output power caused by heating the microresonators were also measured and explained in terms of the microresonator quality factor.
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Filip Todorov, Michal Jelínek, Vlastimil Matejec, Miroslav Chomát, Václav Kubecek, Daniela Berková, and Radek Sedlár "Preparation and characterization of optical microspheres for refractive-index sensing", Proc. SPIE 7716, Micro-Optics 2010, 77161X (13 May 2010);

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