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17 November 2014 Intensity modulation photonic crystal fiber based refractometer in the visible wavelength range
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A novel evanescent field refractometer based on a two-core photonic crystal fiber (TWPCF) sandwiched between multimode fibers(MMFs) is demonstrated. Through splicing a short piece of TWPCF between two MMFs, a simple structure and high sensitivity RI sensor can be constructed. Instead of using wavelength information as sensor signal, we focus more on the light intensity signal different from most PCF based RI sensor. The TWPCF section functions as a tailorable bridge between the excited high order modes and the surrounding refractive index (SRI). With a light filter inserting in the front of white light, the transmission spectrum of the light through the sensing region occurs in a welldefined wavelength bands. As a result, the peak power of the transmission light is tailored with the SRI perturbation via the MMF-TWPCF–MMF structure. The experiment result shows a quadratic relation between the light intensity and samples within RI range of 1.33-1.41 while a linear response can be achieved from the 1.33-1.35 which is a most used RI range for biologically sensing.
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Yun Liu, Shimeng Chen, Xinpu Zhang, Zhenfeng Gong, and Wei Peng "Intensity modulation photonic crystal fiber based refractometer in the visible wavelength range", Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 92741A (17 November 2014);

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