7 November 2007 New optical cylindrical microresonators
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In this paper we describe a novel technique for the fabrication of aluminosilicate microfibres and microtubes which are shown to act as optical cylindrical microresonators. The alumosilicate microfibres and microtubes were fabricated by using vacuum-assisted wetting and filtration of silica gel through a microchannel glass matrix. The microfibres and microtubes were studied using Scanning Electron Microscopy (SEM), micro-photoluminescence spectroscopy and fluorescence lifetime imaging confocal microscopy. In the emission spectra of the micro-resonators we find very narrow periodic peaks corresponding to the whispering gallery modes of two orthogonal polarizations with quality factors up to 3200. A strong enhancement in photoluminescence decay rates at high excitation power demonstrates the occurrence of amplified spontaneous emission from a single microtube. These microtubes show a large evanescent field extending many microns beyond the tube radius. Potential applications for these novel microresonators will be in the area of optical microsensors for a single molecule detection of biological and chemical species, including anti-terrorism and defense sectors.
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Yurii K. Gun'ko, Yurii K. Gun'ko, Sivakumar Balakrishnan, Sivakumar Balakrishnan, Joseph E. McCarthy, Joseph E. McCarthy, Yuri P. Rakovich, Yuri P. Rakovich, John F. Donegan, John F. Donegan, Tatiana S. Perova, Tatiana S. Perova, Vasily Melnikov, Vasily Melnikov, } "New optical cylindrical microresonators", Proc. SPIE 6739, Electro-Optical Remote Sensing, Detection, and Photonic Technologies and Their Applications, 67391F (7 November 2007); doi: 10.1117/12.737362; https://doi.org/10.1117/12.737362

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