Microchanneled chirped fibre Bragg gratings for simultaneous refractive index and temperature measurements

Pouneh Saffari; Hongyan Fu; Kaiming Zhou; Lin Zhang; Ian Bennion

doi:10.1117/12.820651

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18 May 2009 Microchanneled chirped fibre Bragg gratings for simultaneous refractive index and temperature measurements

Pouneh Saffari, Hongyan Fu, Kaiming Zhou, Lin Zhang, Ian Bennion

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Proceedings Volume 7356, Optical Sensors 2009; 735604 (2009) https://doi.org/10.1117/12.820651
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

We report here the fabrication, charaterisation and refractive index sensing of two microchanneled chirped fiber Bragg gratings (MCFBGs) with different channel sizes (~550μm and ~1000μm). The chirped grating structures were UV-inscribed in optical fibre and the microchannels were created in the middle of the CFBGs by femtosecond (fs) laser assisted chemical etching method. The creation of microchannels in the CFBG structures gives an access to the external index liquid, thus inducing refractive index (RI) sensitivity to the structure. In comparison with previously reported FBG based RI sensors, for which the cladding layers usually were removed, the MCFBGs represent a more ideal solution for robust devices as the microchannel will not degrade the structure strength. The two MCFBGs were spectrally charaterised for their RI and temperature responses and both gratings exhibited unique thermal and RI sensitivities, which may be utilised for implementation of bio-chemical sensors with capability to eliminate temperature crosssensitivity.

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Pouneh Saffari, Hongyan Fu, Kaiming Zhou, Lin Zhang, and Ian Bennion "Microchanneled chirped fibre Bragg gratings for simultaneous refractive index and temperature measurements", Proc. SPIE 7356, Optical Sensors 2009, 735604 (18 May 2009); https://doi.org/10.1117/12.820651

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