Investigation On The Microstructured Optical Fiber-Based Surface Plasmon Resonance Sensor

Sensing technology related to the development and advancement of future technology is the key technology to obtain information. And its development in the final analysis depends on the study of novel sensors. In recent years, microstructured optical fibers as a new type of fibers are widely used in physics, chemistry, biology and medical fields and so on. Compared with conventional optical fibers, microstructured optical fibers are drawing flexible, containing multi holes and easy to optimize the optical field distribution which provide a new way of thinking for the sensors’design and are important for the surface plasmon sensors to integration and miniaturization.The work of this dissertation is studied both theoretically and experimentally on microstructured optical fiber-based surface plasmon resonance sensors. The major work and innovations are as follows.1. Introduce the basic concepts, characteristics and development of microstructure optical fibers and surface plasmon resonance. Then analyze the basic principles of surface plasmon resonance sensor in detail.2. Design a novel microstructured fiber-based surface plasmon resonance sensor. Use finite element to build the theoretical model. Then analyze the gold nanolayer and microstructured fiber structure parameters influence on the performance of this surface plasmon sensor. The results show that:the maximum sensitivity of the sensor is1.68×104nm/RIU, and the maximum resolution is5.9×10-6RIU. In addition, under the same structure and theoretical model, compared to the gold nanolayer sensor, the silver nanolayer sensor have higher sensitivity, signal to noise ratio and quality factor. However, due to the chemical properties of gold is more stable than silver, we usually use gold as the metal to excite surface plasmon resonance in practical.3. Try to introduce self-assembled monolayer technology which is easy to implement, low-cost and safe to coat the surface of the fiber. The results show that:The method can coat gold nanoparticles with the fiber surface. Due to the technology is not affected by the fiber shape, size and other physical factors, so this can be applied to the deposition experiment in microstructured optical fiber coating. However, to successfully coated with a high-quality monolayer, we should pay attention to the pretreatment of the sample surface, PH value of the liquid, temperature and other factors.