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Integrated Microfibre Device for Refractive Index and Temperature Sensing
Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia
Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
* Author to whom correspondence should be addressed.
Received: 30 June 2012; in revised form: 30 July 2012 / Accepted: 15 August 2012 / Published: 29 August 2012
Abstract: 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.
Keywords: microfibre; microfibre resonator; sensor; integrated devices
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MDPI and ACS Style
Lim, K.-S.; Aryanfar, I.; Chong, W.-Y.; Cheong, Y.-K.; Harun, S.W.; Ahmad, H. Integrated Microfibre Device for Refractive Index and Temperature Sensing. Sensors 2012, 12, 11782-11789.
Lim K-S, Aryanfar I, Chong W-Y, Cheong Y-K, Harun SW, Ahmad H. Integrated Microfibre Device for Refractive Index and Temperature Sensing. Sensors. 2012; 12(9):11782-11789.
Lim, Kok-Sing; Aryanfar, Iman; Chong, Wu-Yi; Cheong, Yew-Ken; Harun, Sulaiman W.; Ahmad, Harith. 2012. "Integrated Microfibre Device for Refractive Index and Temperature Sensing." Sensors 12, no. 9: 11782-11789.