Ms. Xiuxin Liu Profile

Xiuxin Liu

at Dalian Univ of Technology

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Proceedings Article | 11 November 2014 Paper

The wavelength-tunable tapered surface plasmon resonance fiber sensor based on separated input-output channels

Shimeng Chen, Yun Liu, Xiaotong Gao, Xiuxin Liu, Wei Peng

Proceedings Volume 9274, 92741D (2014) https://doi.org/10.1117/12.2071555

KEYWORDS: Sensors, Fiber optics sensors, Geometrical optics, Mirrors, Wavelength tuning, Polishing, Optics manufacturing, Ocean optics, Surface plasmons, Signal to noise ratio

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We present a wavelength-tunable tapered optics fiber surface Plasmon resonance (SPR) sensor by polishing the end faces of multimode fibers(MMF).Two hard plastic clad optical fibers joint closely and are used as the light input and output channels. Their end faces are polished to produce two oblique planes, which are coated with gold film to be the sensing surface and the front mirror. The presence of the tapered geometry formed by the two oblique planes in the orthogonal directions makes it possible to adjust incident angle through changing the tilt angles of the two end faces, so as to achieve tuning the SPR coupling wavelength-angle pair. Compared with previous researches based a tapered optic fiber probe, we report the approach theoretically increase the signal noise ratio (SNR) by separating incident and emergent light propagating in the different coordinate fiber. Since fabricating the sensing surface and the front mirror on the two fibers to replace one single fiber tip, there is more incident light can reach the sensing surface and satisfy SPR effective. In addition, this improvement in structure has advantages of large grinding and sensing area, which can lead to high sensitivity and simple manufacture process of the sensor. Experimental measurement demonstrates the sensor has a favorable SPR resonanceabsorption and the ability of measuring refractive index (RI) of aqueous solution. This novel tapered SPR sensor has the potential to be applied to the biological sensing field.

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