首页|Line by line inscribed small period long period grating for wide range refractive index sensing
Line by line inscribed small period long period grating for wide range refractive index sensing
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NSTL
Elsevier
? 2021 Elsevier B.V.Long period grating (LPG) with a small grating period (25 μm) is inscribed with the femtosecond laser line-by-line technique. The fabricated LPG consists of 500 vertical refractive index (RI) modification lines (15μm in length), corresponding to a compact total length of 12.5 mm. With the fabricated LPG, coupling between core modes is significantly enhanced (from previously reported <0.6 dB to ～11 dB). Moreover, coupling from core mode to forward- and backward-propagating? cladding modes is also enabled. Thanks to the co-existence of forward- and backward-propagating cladding mode resonances, wide range and sensitive RI sensing is realized by the LPG, with a RI sensitivity more than 500 nm/RIU. In addition, the grating shows a low temperature cross-sensitivity, and the enhanced core mode resonance can serve as a monitor for temperature variation, allowing simultaneous measurement of RI and temperature. Note that these advantages are achieved with only one uniform grating. With a simple structure, the proposed grating will be a good choice for applications where wide RI sensing range and simultaneous temperature monitoring are required.
Femtosecond laser direct writingFiber gratingsOptical fiber sensorsRefractive index sensing
Wang J.、Shen F.、Jiang H.、Xia H.、Xie K.、Shu X.、Zhou K.、Zhang L.
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School of Information Engineering Guangdong University of Technology
The State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment School of Electromechanical Engineering Guangdong University of Technology
Wuhan National Laboratory for Optoelectronics & School of Optical and Electronic Information Huazhong University of Science and Technology
Institute of Photonic and Technologies Aston University
NSTL
Elsevier
