Sensitivity of silica microspheres modified by xerogel layers to acetone and ethanol

0374695 - ÚFE 2012 RIV US eng C - Conference Paper (international conference)
Matějec, Vlastimil - Todorov, Filip - Jelínek, M. - Fibrich, M. - Chomát, Miroslav - Kubeček, V. - Berková, Daniela
Sensitivity of silica microspheres modified by xerogel layers to acetone and ethanol.
Optical Sensors 2011 and Photonic Crystal Fibers V (Proceedings of SPIE Vol. 8073). Bellingham: SPIE, 2011, 80730X1-80730X11. ISBN 978-0-8194-8663-9.
[Conference on Optical Sensors and Photonic Crystal Fibers V. Praha (CZ), 18.04.2011-20.04.2011]
Institutional research plan: CEZ:AV0Z20670512
Keywords : surface effects * optical microresonator * ethanol
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

The paper deals with the preparation and characterization of whispering-gallery-mode silica spherical microresonators and with effects of liquid acetone, ethanol, and xerogel layers applied onto these microresonators on their resonance spectra. Microrespheres with diameters ranging from 320 to 360 mu m have been prepared by heating a tip of a silica fiber with a hydrogen-oxygen burner. The microspheres were excited by a fiber taper or a bulk prism and their resonance spectra were measured. Values of the Q factor from 10(4) to 10(6) have been determined from these spectra. In experiments, it has been found that short contact of microspheres with acetone causes a shift of resonance dips due to surface effects caused by acetone. A decrease of the Q factor has been observed with a microresonator onto which a xerogel silica layer was applied by the sol-gel method. A very high decrease of the Q factor has been observed when the silica microresonator was brought in contact with liquid ethanol.
Permanent Link: http://hdl.handle.net/11104/0207552