Study On Calculation And Application Of One-Dimensional Optomechanical Crystal And Whispering Gallery Cavity

Cavity optomechanics is a branch of physics,which mainly studies the interaction between the light field and the mechanical motion on microcavities.It can be used to study the strong interaction process between light and matter,and realize physical phenomena such as quantum ground state cooling,quantum entanglement,electromagnetically induced transparency,and slow wave propagation.Cavity optomechanics has important scientific research significance in the field of quantum information technology.Meanwhile,cavity optomechanics also has broad application prospects in the field of precision measurement.Physical quantities such as acceleration,small displacement,weak force and mass,can influence the mechanical vibration of the cavity optomechanical system.The mechanical vibration mode of the cavity optomechanical system can be read through optomechanical coupling to realize the detection of these physical quantities.In this thesis,a series of theoretical simulations on the calculation and application of one-dimensional optomechanical crystal cavity and whispering gallery microcavity.The work can be summarized as follows:1.The numerical calculation methods and key performance parameters of the optomechanical crystal cavity are introduced.For the aim of the quantum ground state cooling of the mechanical oscillator,a one-dimensional optomechanical crystal cavity with high mechanical resonance frequency and high optomechanical coupling parameter is simulated and designed.The one-dimensional optomechanical crystal cavity with phononic shield is simulated by theoretical simulation.2.We present the analysis of the influence of fabrication imperfections on the optical,mechanical and optomechanical coupling characteristics in an optomechanical crystal cavity.Using a perturbation that breaks a symmetry in the elastic structure,we induce phonon leakage without affecting the optical properties.3.The optical and mechanical properties of the one-dimensional optomechanical crystal cavity and the lithium niobate microdisk are tested based on the set-up measurement system through the tapered fiber coupling method.4.Through the finite element simulation of the coupling between the microparticle and the lithium niobate microdisk,the lithium niobate microdisk can be used to detect the mechanical motion of the microparticle.