Study On Localized Surface Fano Resonance Of Optical Waveguide Nanostructures

Surface plasmon resonance is a phenomenon that occurs at the junction of metal and medium.When incident light is incident on the metal through a waveguide such as SiO₂ or a polymer,it excites free electrons in the metal and causes collective oscillation of free electrons.When the incident light frequency is the same as the free electron oscillation frequency,resonance occurs.Surface plasmon Fano resonance is a new phenomenon discovered in surface plasmon nanostructures in recent years.It has a narrow line shape and high sensitivity to the surrounding environment,and has a wide application prospect,making it a research hotspot in recent years.In this paper,based on these properties of Fano resonance,optoelectronic devices that can be applied in the 1550 nm communication band and sensor devices used in different solutions to be tested are studied.The main research contents of this paper are as follows:?1?Deriving the dispersion relation of the surface plasmon and the field strength enhancement factor of the local surface plasmon according to the formula to better understand the principle of Fano resonance;?2?Studying the microscopic origin,definition,nature,production mode,and development history of surface plasma Fano resonance;?3?Study the simulation software time domain finite difference method?FDTD?used in this research topic to understand its calculation method and basic principle;?4?Design a structure capable of generating Fano resonance,and change its structural parameters to red shift the resonance wavelength to the wavelength of 1550 nm,in order to be applied in the communication band;?5?Understand the structural characteristics of Fano resonance and study what kind of structure can produce Fano resonance.According to the characteristics,a new structure that can generate Fano resonance is designed,and its sensing performance is studied to make a sensor device for application.