The Study Of Sensitive Sensing Based On Whispering-gallery Mode Microcavities

With the development of modern information technology,the requirements for the integration of micro-and-nano devices are gradually increasing.As Moore's law is approaching the limit,the advantages of large-scale integration of electronic devices will no longer exist.Micro-nano optical devices have advantages in heat dissipation,anti electromagnetic interference and data transmission,and have gradually becoming the research hotspot of optical communication and physical optics in recent years.Among them,the research and applications of optical microcavities as a basic optical element in optical information processing and high sensitivity detection are gradually deepening.Because of its properties of high quality factor and small mode volume,Whispering-gallery mode optical microcavity can enhance the interaction between light and matter in the system,so it shows rich physical phenomena and properties.In this paper,the whispering-gallery mode optical microcavity is used as the research platform to explore its nonlinear dynamic properties,as well as the theory of nano-particle sensing and magnetic field detection.The main contents of this paper are as follows1?Based on the whispering-gallery mode optical microcavity,a sensing scheme for real-time angular coordinate detection of nanoparticles is proposed.By measuring the quality factor and eigenfrequencies of the microcavity which are used as the basic parameters,the scatter is coupled to the evanescent field of the microcavity to produce the splitting of the optical mode;the scheme uses the three lasers with different frequency as the pump to detect the target scatter,and the real-time angular coordinates can be derived from the transmission spectrum characteristics.This method does not need the frequency scanning of the pump field,and it has high time resolution and real-time performance.2?A weak magnetic field detection scheme based on the optical-magnetic whispering-gallery mode microcavity is proposed.By adjusting the frequency of light field and microwave field,the input light field and microwave field are scanned synchronously in the opposite direction to detect the frequency shift of optical mode.According to the linear relationship between the magnon frequency and the external bias magnetic field,the magnetic field intensity can be obtained.Because the measurement process does not require external degrees of freedom as the control,the external magnetic field can be directly measured and readout through the optical magnetic cavity spectrum,so it is more stable.3?The effective control method of chaos in the optical magnetic microcavity is studied.There is a physical process of scattering photons in different states by magnons in the optical magnetic cavity system.We find that in the highly symmetric system,the reflection of photons will also produce chaos.Further research shows that chaos will appear when the evolution trajectory of quantum superposition state becomes ellipse.In this study,the Poincare's cross section of the system is chosen as the extremum state in the energy evolution process of right-handed and left-handed single photon states,and the generation of chaos and its boundary conditions are studied.