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A chemical sensor based on surface plasmon resonance on surface-modified optical fibers.

机译：基于表面改性光纤上的表面等离子体共振的化学传感器。

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摘要

A sensor is described which utilizes the phenomenon of surface plasmon resonance to detect changes in refractive index of chemical or biochemical samples applied to a surface modified optical fiber.; The sensor is constructed by polishing a short section of the lateral surface of an optical fiber to its evanescent field surrounding the fiber core. One or more thin films are applied to the polished section of the fiber to produce the sensing element. One of the films is the metal silver, which acts as the support for the surface plasmon.; Under the proper conditions, TM polarized energy propagating in the fiber can be coupled to a surface plasmon electromagnetic mode on the metal film. This coupling depends on the wavelength, the nature of the fiber, the refractive index and thickness of the thin films applied to the fiber, and the refractive index of a chemical sample in contact with the modified surface. The fiber to plasmon coupling is seen as a large attenuation of the light reaching the distal terminus of the fiber.; A dispersion equation is derived which predicts the conditions necessary to achieve resonance on both the three layer (fiber/metal/chemical sample) and four layer (fiber/metal/overlay/sample) geometries. Details of sensor construction and instrumental design are given, along with experiments which illustrate the feasibility of SPR generation on an optical fiber and verify the predicting power of the dispersion equations. A comparison is given between the fiber-based instrument and classical prism-based SPR devices.; Several possible future improvements and applications of the device are given, along with possible sensor and instrumental configurations.
机译：描述了一种传感器，该传感器利用表面等离子体共振现象来检测施加到表面改性光纤上的化学或生物化学样品的折射率变化。传感器是通过将光纤侧面的一小部分抛光到围绕光纤纤芯的渐逝场而构造的。将一层或多层薄膜施加到光纤的抛光部分以产生传感元件。薄膜之一是金属银，它充当表面等离激元的载体。在适当的条件下，可以将在光纤中传播的TM极化能量耦合到金属膜上的表面等离激元电磁模式。这种耦合取决于波长，纤维的性质，施加到纤维上的薄膜的折射率和厚度以及与改性表面接触的化学样品的折射率。光纤与等离激元的耦合被视为到达光纤远端的光的大衰减。推导了一个色散方程，该方程预测了在三层（纤维/金属/化学样品）和四层（纤维/金属/覆盖层/样品）几何结构上实现共振所需的条件。给出了传感器构造和仪器设计的详细信息，以及一些实验，这些实验说明了在光纤上生成SPR的可行性并验证了色散方程的预测能力。比较了基于光纤的仪器和基于经典棱镜的SPR设备。给出了该设备的几种可能的未来改进和应用，以及可能的传感器和仪器配置。

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  • 作者

    Bender, William John Havercamp.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Chemistry Analytical.; Physics Optics.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;光学;
  • 关键词

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