Journal
SENSORS
Volume 12, Issue 9, Pages 11782-11789Publisher
MDPI AG
DOI: 10.3390/s120911782
Keywords
microfibre; microfibre resonator; sensor; integrated devices
Funding
- University of Malaya [UM.C/ HIR/MOHE/SC/01, UM.TNC2/RC/AET/261/1/1/RP019-2012C]
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A microfibre device integrating a microfibre knot resonator in a Sagnac loop reflector is proposed for refractive index and temperature sensing. The reflective configuration of this optical structure offers the advantages of simple fabrication and ease of sensing. To achieve a balance between responsiveness and robustness, the entire microfibre structure is embedded in low index Teflon, except for the 0.5-2 mm diameter microfibre knot resonator sensing region. The proposed sensor has exhibited a linear spectral response with temperature and refractive index. A small change in free spectral range is observed when the microfibre device experiences a large refractive index change in the surrounding medium. The change is found to be in agreement with calculated results based on dispersion relationships.
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