Abstract
We present an elliptical core D-shaped photonic crystal fiber-based plasmonic sensor, and the coupling characters for different refractive index of detected analyte are investigated by finite element method. It is found that the sensitivity depends strongly on the slope of the phase difference at resonant wavelength for phase interrogation, and the sensitivity can be up to 2.2 × 105 deg/RIU/cm when the sensor works close up to the upper detection limit of analyte refractive index of 1.373. Based on our discussion, the higher sensitivity always associates with narrower dynamic sensing range. As a comparison, wavelength interrogation has been included in the paper, and it offers wider dynamic sensing range and higher upper detection limit but much lower sensitivity. Overall, the resonances of different order plasmonic modes and core mode play essential role in both schemes.
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Acknowledgments
This work was supported in part by the State Key Development Program for Basic Research of China under Grant No. 2010CB327604, and the National Natural Science Foundation of China under Grant No. 61377100.
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Shi, F., Peng, L., Zhou, G. et al. An Elliptical Core D-Shaped Photonic Crystal Fiber-Based Plasmonic Sensor at Upper Detection Limit. Plasmonics 10, 1263–1268 (2015). https://doi.org/10.1007/s11468-015-9931-4
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DOI: https://doi.org/10.1007/s11468-015-9931-4