Optical fiber surface plasmon resonance(SPR)sensors point toward promising application potential in the fields of biomarker detection,food allergen screening,and environmental monitoring due to their unique advantages.This review outlines approaches in improving the fiber SPR sensing performance,e.g.,sensitivity,detection accuracy,reliability,cross-sensitivity,selectivity,convenience and efficiency,and corresponding sensing applica-tions.The sensing principles of SPR sensors,especially the performance indicators and their influencing factors,have been introduced.Current technologies for improving the fiber SPR performance and their application sce-narios are then reviewed from the aspects of fiber substrate,intrinsic layer(metal layer),and surface nanomaterial modification.Reasonable design of the substrate can strengthen the evanescent electromagnetic field and realize the multi-parameter sensing,and can introduce the in situ sensing self-compensation,which allows corrections for errors induced by temperature fluctuation,non-specific binding,and external disturbances.The change of the intrinsic layer can adjust the column number,the penetration depth,and the propagation distance of surface plasmon polaritons.This can thereby promote the capability of sensors to detect the large-size analytes and can reduce the full width at half-maximum of SPR curves.The modification of various-dimensionality nanoma-terials on the sensor surfaces can heighten the overlap integral of the electromagnetic field intensity in the analyte region and can strengthen interactions between plasmons and excitons as well as interactions between analyte molecules and metal surfaces.Moreover,future directions of fiber SPR sensors are prospected based on the im-portant and challenging problems in the development of fiber SPR sensors.

JIANYING JING;KUN LIU;JUNFENG JIANG;TIANHUA XU;SHUANG WANG;JINYING MA;ZHAO ZHANG;WENLIN ZHANG;TIEGEN LIU

School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Opto-Electronics Information Technology,Ministry of Education,Tianjin University,Tianjin 300072,China;Tianjin Optical Fiber Sensing Engineering Center,Institute of Optical Fiber Sensing,Tianjin University,Tianjin 300072,China

光子学研究（英文）

[1]JIANYING JING;KUN LIU;JUNFENG JIANG;TIANHUA XU;SHUANG WANG;JINYING MA;ZHAO ZHANG;WENLIN ZHANG;TIEGEN LIU-.Performance improvement approaches for optical fiber SPR sensors and their sensing applications)[J].光子学研究（英文）,2022(01):126-147

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