Compact three segmented multimode fibre modal interferometer for high sensitivity refractive-index measurement

We experimentally demonstrate a new compact surrounding refractive-index sensor using a MMF-CSF-MMF (MCM) structure. The evanescent waves in the coreless silica fibre (CSF) region can directly interact with the surrounding medium. Due to its distinctive resonant spectral feature, the MCM sensor showed a high sensitivity of 4.37 × 10−4 for a refractive index range of 1.30 to 1.44, suggesting that the proposed device may be suitable for a wide range of biomedical and chemical sensor applications.

[1]  Andrey Andreev,et al.  Single-mode fiber polished into the core as a sensor element , 1998 .

[2]  A. Mehta,et al.  Multimode interference-based fiber-optic displacement sensor , 2003, IEEE Photonics Technology Letters.

[3]  George Stewart,et al.  Prospects for fibre-optic evanescent-field gas sensors using absorption in the near-infrared , 1997 .

[4]  O. Wolfbeis.  Fiber-optic chemical sensors and biosensors. , 2002, Analytical chemistry.

[5]  Byeong Ha Lee,et al.  Measurement of refractive-index variation with temperature by use of long-period fiber gratings. , 2002, Optics letters.

[6]  Reinhardt Willsch,et al.  A fibre Bragg grating refractometer , 2001 .

[7]  S. B. Lee,et al.  Displacements of the resonant peaks of a long-period fiber grating induced by a change of ambient refractive index. , 1997, Optics letters.

[8]  S. James,et al.  Optical fibre long-period grating sensors: characteristics and application , 2003 .

[9]  Atsushi Seki,et al.  Hetero-core structured fiber optic surface plasmon resonance sensor with silver film , 2004 .

[10]  Alan D. Kersey,et al.  Analysis of the response of long period fiber gratings to external index of refraction , 1998 .

[11]  Donato Luna-Moreno,et al.  In-line optical fiber sensors based on cladded multimode tapered fibers. , 2004, Applied optics.

[12]  I. Bennion,et al.  Sampled fiber Bragg grating for simultaneous refractive-index and temperature measurement. , 2001, Optics letters.

[13]  P. Krulevitch,et al.  In vitro and in vivo measurements of fiber optic and electrochemical sensors to monitor brain tissue pH , 2001 .

[14]  O. Wolfbeis.  Fiber-optic chemical sensors and biosensors. , 2000, Analytical chemistry.

[15]  G. Holst,et al.  Fibre optic refractive index microsensor based on white-light SPR excitation , 2004 .

[16]  Ravi K. Varshney,et al.  Transmission characteristics of SMS fiber optic sensor structures , 2003 .