A long-period grating (LPG) based compact optical fiber sensor working in reflection mode is demonstrated. A technique to make a mirror on the cladding region of a fiber end-face to reflect only the cladding modes was realized by growing a polymeric microtip on the core region of the fiber end-face, by photopolymerization, followed by coating the fiber end-face with an aluminum film. Using the cladding-mode-selective fiber end-face mirror, the transmission spectrum of the LPG was "inverted" and reflected. Preliminary results of using the sensor to measure the refractive index of glycerol/water solutions were successfully demonstrated.
CITATION STYLE
Jiang, M., Zhang, A. P., Wang, Y.-C., Tam, H.-Y., & He, S. (2009). Fabrication of a compact reflective long-period grating sensor with a cladding-mode-selective fiber end-face mirror. Optics Express, 17(20), 17976. https://doi.org/10.1364/oe.17.017976
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