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Ultra-narrowband near-infrared tunable two-dimensional perfect absorber for refractive index sensing

机译：超窄带近红外可调二维完美吸收器，用于折射率传感

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摘要

An ultra-narrow-bandwidth near-infrared perfect plasmonic absorber with a periodic structure composed of metal-insulator-metal configuration is numerically designed and analyzed for a refractive index sensor. A perfect absorptivity of 99.99% and a rather narrow bandwidth of 2 nm are observed in the near-infrared wave band when the light is vertically incident in the structure. The ultra-high absorption and ultra-narrowbandwidth are explained as local surface plasmon resonance stimulated in the structure. The absorber is put into use as a plasmonic refractive index sensor with wavelength sensitivity as high as 1500 nm/RIU and figure of merit as high as 750, which significantly surpass those of many plasmonic sensors proposed in the past few decades. The designed absorber is tunable by changing geometry parameters. Because of the excellent sensing properties mentioned above, the proposed structure can be widely applied in fields such as photodetectors, biosensors, and chemical molecule detection. (C) 2021 Optical Society of America
机译：针对折射率传感器，对一种由金属-绝缘体-金属结构组成的周期结构超窄带宽近红外理想等离子体吸收体进行了数值设计和分析。当光垂直入射到结构中时，在近红外波段观察到99.99%的完美吸收率和相当窄的2nm带宽。超高吸收和超窄带宽被解释为结构中激发的局域表面等离子体共振。该吸收体作为等离子体折射率传感器投入使用，其波长灵敏度高达1500 nm/RIU，优值高达750，大大超过了过去几十年提出的许多等离子体传感器。所设计的吸收器可通过改变几何参数进行调谐。由于上述优良的传感特性，该结构可广泛应用于光探测器、生物传感器和化学分子检测等领域。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第14期|共7页
  • 作者

    Huang Xing; Wang Tao; Yan Ruoqin; Jiang Xiaoyun; Yue Xinzhao; Wang Lu;

  • 作者单位

    Huazhong Univ Sci &

    Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China;

    Huazhong Univ Sci &

    Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China;

    Huazhong Univ Sci &

    Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China;

    Huazhong Univ Sci &

    Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China;

    Huazhong Univ Sci &

    Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China;

    Huazhong Univ Sci &

    Technol Wuhan Natl Lab Optoelect Wuhan Peoples R China;

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