Research Papers: Sensing

Design of refractive index sensors based on the wavelength-selective resonant coupling phenomenon in dual-core photonic crystal fibers

[+] Author Affiliations
Bing Sun, Ming-Yang Chen, Yong-Kang Zhang, Ji-chang Yang

Jiangsu University, School of Mechanical Engineering, Department of Optical Engineering, Zhenjiang 212013, Jiangsu Province, China

J. Biomed. Opt. 17(3), 037002 (Mar 13, 2012). doi:10.1117/1.JBO.17.3.037002
History: Received August 10, 2011; Revised January 12, 2012; Accepted January 13, 2012
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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 1.2×104nm per refractive index unit (RIU). In addition, the detection limit is as low as 2.5×107RIU at na=1.33.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Bing Sun ; Ming-Yang Chen ; Yong-Kang Zhang and Ji-chang Yang
"Design of refractive index sensors based on the wavelength-selective resonant coupling phenomenon in dual-core photonic crystal fibers", J. Biomed. Opt. 17(3), 037002 (Mar 13, 2012). ; http://dx.doi.org/10.1117/1.JBO.17.3.037002


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