Journal
OPTICS EXPRESS
Volume 26, Issue 7, Pages 8431-8442Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.008431
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Funding
- Dublin Institute of Technology
- DIT Fiosraigh Scholarship Program
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Thermo-optic tuning of whispering gallery modes (WGMs) in a nematic liquid crystal-filled thin-walled capillary tube resonator is reported. WGMs were excited by the evanescent field from a tapered optical fiber. Tapered optical fiber fabrication and reduction of wall thickness of the capillary tube was carried out by a ceramic micro-heater brushing technique. A simple and robust packaging technique is demonstrated to ensure stable and repeatable operation of the device. Tunability of WGMs with temperature was demonstrated with a sensitivity of 267.5 +/- 2.5 pm/degrees C. The demonstrated thermo-optic method for WGMs tuning is potentially useful for many tunable photonic devices and sensors. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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