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Sensors 2012, 12(9), 11782-11789; doi:10.3390/s120911782

Integrated Microfibre Device for Refractive Index and Temperature Sensing

1,* , 2
Received: 30 June 2012 / Revised: 30 July 2012 / Accepted: 15 August 2012 / Published: 29 August 2012
(This article belongs to the Section Physical Sensors)
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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.
Keywords: microfibre; microfibre resonator; sensor; integrated devices microfibre; microfibre resonator; sensor; integrated devices
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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