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Highly Sensitive SPR Sensor Based on D-shaped Photonic Crystal Fiber Coated with Indium Tin Oxide at Near-Infrared Wavelength

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Abstract

A surface plasmon resonance (SPR) sensor based on D-shaped photonic crystal fiber (PCF) coated with indium tin oxide (ITO) film is proposed and numerically investigated. Thanks to the adjustable complex refractive index of ITO, the sensor can be operated in the near-infrared (NIR) region. The wavelength sensitivity, amplitude sensitivity, and phase sensitivity are investigated with different fiber structure parameters. Simulation results show that ∼6000 nm/refractive index unit (RIU), ∼148/RIU, and ∼1.2 × 106 deg/RIU/cm sensitivity can be achieved for wavelength interrogation, amplitude interrogation, and phase interrogation, respectively, when the environment refractive index varies between 1.30 and 1.31. It is noted that the wavelength sensitivity and phase sensitivity are more pronounced with larger refractive index. The proposed SPR sensor can be used in various applications, including medicine, environment, and large-scale targets detection.

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Acknowledgments

The project was supported by the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan).

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  1. School of Mechanical Engineering and Electronic Information, China University of Geosciences (Wuhan), Wuhan, 430074, China

    Tianye Huang

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  1. Tianye Huang
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Correspondence to Tianye Huang.

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Huang, T. Highly Sensitive SPR Sensor Based on D-shaped Photonic Crystal Fiber Coated with Indium Tin Oxide at Near-Infrared Wavelength. Plasmonics 12, 583–588 (2017). https://doi.org/10.1007/s11468-016-0301-7

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  • DOI: https://doi.org/10.1007/s11468-016-0301-7

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