【摘 要】
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In this paper,a refractive index(RI)sensor based on the twin-core photonic crystal fiber(TC-PCF)is presented.In-troducing the rectangular array in the core area
【机 构】
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The Key Laboratory of Computer Vision and System of Ministry of Education,Tianjin Key Laboratory of
论文部分内容阅读
In this paper,a refractive index(RI)sensor based on the twin-core photonic crystal fiber(TC-PCF)is presented.In-troducing the rectangular array in the core area makes the PCF possible to obtain high birefringence and low confine-ment loss over the wavelength range from 0.6 μm to 1.7 μm.Therefore,the core region can enhance the interaction between the core mode and the filling material.We studied theoretically the evolution characteristics of the birefrin-gence and operating wavelength corresponding to the strongest polarization point under the condition of filling the rectangular array with RI matching fluid range from 1.33 to 1.41.Simulation results reveal that the proposed TC-PCF has opposite evolutions of change rates between the B and wavelength,and the maximum RI sensing sensitivities of 1.809×10-2 B/RIU and 8 700 nm/RIU at low and high RI infill are obtained respectively,which means that the TC-PCF features of dual-parameter demodulation for the RI sensing can maintain a high refractive index sensing sen-sitivity within a large scope of RI ranging from 1.33 to 1.41.Compared with the results of single-parameter demodula-tion,it is an optimized method to improve the sensitivity of low refractive index sensors,which has great application potency in the field of biochemical sensing and detection.
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