Indium Tin Oxide Coated Two-Mode Fiber for Enhanced SPR Sensor in Near-Infrared Region
Indium Tin Oxide Coated Two-Mode Fiber for Enhanced SPR Sensor in Near-Infrared Region
复制标题
用于近红外区增强型 SPR 传感器的氧化铟锡涂层双模光纤
DOI：
10.1109/jphot.2017.2757513
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发表时间：
2017
影响因子：
2.4
通讯作者：
Chen Zhe
中科院分区：
文献类型：
--
作者：
Wang Yajun;Dong Jiangli;Luo Yunhan;Tang Jieyuan;Lu Huihui;Yu Jianhui;Guan Heyuan;Zhang Jun;Chen Zhe
提出了一种基于涂有氧化铟锡（ITO）薄膜的侧面抛光双模光纤（TMF）的表面等离子体共振（SPR）传感器。 ITO 可以通过改变载流子浓度来调节传感器的谐振波长。该传感器结合了TMF和ITO的优点，可以实现高灵敏度和近红外区域的等离子体频率。利用与特定表面等离子体模式耦合的 LP01 和 LP11a 模式，对 ITO 薄膜厚度和残余光纤厚度对传感性能的影响进行了数值研究。结果表明，当环境折射率在1.33和1.39之间变化时，谐振波长位于1500-2200 nm，LP01和LP11a模式的平均灵敏度分别为~10149和~10400 nm/RIU。 LP01 和 LP11a 模式的倏逝波的穿透深度分别为 460 和 502 nm。该传感器的灵敏度和穿透深度均大于基于单模光纤和多模光纤的SPR传感器。所提出的传感器可以在环境、医学和安全等各种应用中发挥重要作用。
A surface plasmon resonance (SPR) sensor based on side-polished two-mode fiber (TMF) coated with indium tin oxide (ITO) film is proposed. ITO enables tuning of resonance wavelength of the sensor through changing its carrier concentration. The advantages of the TMF and ITO are combined in the sensor, which can achieve high sensitivity and plasma frequencies in the near-infrared region. The impact of ITO film thickness and residual fiber thickness on the sensing performance are numerically investigated with LP01 and LP11a modes coupled to specific surface plasmon modes. The results show that the resonance wavelength locates in 1500–2200 nm and an average sensitivity of ∼10149 and ∼10400 nm/RIU can be achieved for LP01 and LP11a modes, respectively, when the environmental refractive index varies between 1.33 and 1.39. The penetration depths of evanescent wave for the LP01 and LP11a modes are 460 and 502 nm, respectively. Both the sensitivity and penetration depth of the sensor are larger than those of single-mode fiber and multimode fiber based SPR sensors. The proposed sensor can play an important role in various applications, including environment, medicine, and security.