13 March 2012 Design of refractive index sensors based on the wavelength-selective resonant coupling phenomenon in dual-core photonic crystal fibers
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Abstract
Design strategies for high-sensitivity refractive index sensors based on the principle of wavelength-selective resonant coupling in dual-core photonic crystal fibers are presented. Phase matching at a single wavelength can be achieved between an analyte-filled microstructured core and a small core with a down-doped rod or one small air hole in the center, thus enabling selectively directional resonant-coupling between the two cores. The transmission spectra of the output light presents a notch at the index-matched wavelength, yielding a resonant wavelength depending on the refractive index of the analyte. Numerical simulations demonstrate that both of the two proposed sensors can be used for highly sensitive detection of low-index analyte. In particular, the configuration realized by introducing the fiber with a small air hole in one core can be used to the detection of the analyte index around 1.33 and the sensitivity reach to 1.2×104  nm per refractive index unit (RIU). In addition, the detection limit is as low as 2.5×10−7  RIU at na = 1.33.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Bing Sun, Ming-Yang Chen, Yong-Kang Zhang, Ji-Chang Yang, "Design of refractive index sensors based on the wavelength-selective resonant coupling phenomenon in dual-core photonic crystal fibers," Journal of Biomedical Optics 17(3), 037002 (13 March 2012). https://doi.org/10.1117/1.JBO.17.3.037002 . Submission:
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