纳米光纤表面倏势场的场强分布可以用麦克斯韦方程组和边界条件来描述。通过解析法可以得到其精确解224。场强在纳米光纤表面以指数形式衰减。全内反射显微镜TIRM和扫描近场光学显微镜SNOM是两种用于描述生物和光学应用中产生的倏势场的重要技术227–229。在传统方案中激光在高折射率的棱镜和低折射率的空气的表面发生全反射倏势场延伸到纳米光纤表面空气中亚波长量级的距离。这两种技术都要用到价格昂贵的显微镜。

Translation:

The distribution of the field strength of the surface plasmon field of a nanofiber can be described using Maxwell's equations and boundary conditions. Its exact solution can be obtained through analytical methods [224]. The field strength decays exponentially at the surface of the nanofiber. Total internal reflection microscopy (TIRM) and scanning near-field optical microscopy (SNOM) are two important techniques used to describe the plasmon fields generated in biological and optical applications [227-229]. In traditional approaches, laser light undergoes total reflection at the surface of a high refractive index prism and low refractive index air, and the plasmon field extends to a sub-wavelength distance in the air at the surface of the nanofiber. Both of these techniques require expensive microscopes. TIRM technology directly measures the plasmon field by inserting microspheres into the field [230] or by coating the interface with a polymer [227], which can damage the surface of the nanofiber and increase experimental complexity. SNOM technology inserts a small aperture probe into the near field of the plasmon field to measure the integrated waveguide's plasmon field [231]. However, the insertion of the probe interferes with the intensity distribution of the plasmon field between the probe and the surface