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Proceedings Paper

High-sensitivity refractive index sensor based on large-angle tilted fiber grating with carbon nanotube deposition
Author(s): Abdulyezir A. Badmos; Qizhen Sun; Zhijun Yan; Raz N. Arif; Junxi Zhang; Alex Rozhin; Lin Zhang
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Paper Abstract

This paper presents a highly sensitive ambient refractive index (RI) sensor based on 81° tilted fiber grating (81°-TFG) structure UV-inscribed in standard telecom fiber (62.5μm cladding radius) with carbon nanotube (CNT) overlay deposition. The sensing mechanism is based on the ability of CNT to induce change in transmitted optical power and the high sensitivity of 81°-TFG to ambient refractive index. The thin CNT film with high refractive index enhances the cladding modes of the TFG, resulting in the significant interaction between the propagating light and the surrounding medium. Consequently, the surrounding RI change will induce not only the resonant wavelength shift but also the power intensity change of the attenuation band in the transmission spectrum. Result shows that the change in transmitted optical power produces a corresponding linear reduction in intensity with increment in RI values. The sample shows high sensitivities of ~207.38nm/RIU, ~241.79nm/RIU at RI range 1.344–1.374 and ~113.09nm/RIU, ~144.40nm/RIU at RI range 1.374–1.392 (for X-pol and Y-pol respectively). It also shows power intensity sensitivity of ~ 65.728dBm/RIU and ~ 45.898 (for X-pol and Y-pol respectively). The low thermal sensitivity property of the 81°-TFG offers reduction in thermal cross-sensitivity and enhances specificity of the sensor.

Paper Details

Date Published: 29 April 2016
PDF: 9 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 989916 (29 April 2016); doi: 10.1117/12.2227703
Show Author Affiliations
Abdulyezir A. Badmos, Aston Univ. (United Kingdom)
Qizhen Sun, Aston Univ. (United Kingdom)
Zhijun Yan, Aston Univ. (United Kingdom)
Raz N. Arif, Aston Univ. (United Kingdom)
Junxi Zhang, Aston Univ. (United Kingdom)
Alex Rozhin, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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