Optical chemsensor based on etched tilted Bragg grating structures in multimode fibre
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We present a simple optical chemsensor device based on tilted Bragg grating structures ultraviolet-inscribed in conventional multimode fiber and sensitized by a hydrofluoric (HF)-etching treatment. The transition behaviors of fiber Bragg gratings (FBGs) from normal to tilted structures and their spectral evolution under HF-etching have been studied. The etched devices have been used to measure the concentrations of sugar solution, showing a potential capability of detecting concentration changes as small as <0.5%, which is an order of magnitude lower than that of previously reported FBG sensors in single-mode fiber.
| Original language | English |
|---|---|
| Pages (from-to) | 864-866 |
| Journal | IEEE Photonics Technology Letters |
| Volume | 17 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 4 Apr 2005 |