Optical Responses And Phonon Laser In Hybrid Optical Cavity Systems

With the rapid development of nanotechnology and precision machining industries,the hybrid optical cavity systems have attracted extensive research interest due to their excellent scalability and ultra-high sensitivity,and provide an important platform for exploring the fundamental principles of quantum mechanics through the radiation pressure between optical and mechanical modes.Therefore,this interaction enables macroscopic systems to exhibit various quantum effects through energy exchange between different subsystems,such as optomechanically induced transparency and phonon laser.To achieve excellent optical amplification or mechanical gain,it is usually necessary to use the gain medium and satisfy strict condition of gain-loss balance.In all-optical polarization control,the polarization conversion efficiency depends heavily on the intensity of the pump field.To improve the ability of system to manipulate the scalar and vector characteristics of photons and generate efficient phonon laser,the thesis studies optical responses and phonon laser in different hybrid optical cavity systems,and the specific research contents are as follows:In a hybrid three-mode cavity optomechanical system consisting of two optical cavities and a mechanical oscillator,the optical response of the system to the probe output field is investigated by driving the two optical cavities separately with two strong pump fields.It has been found that optomechanical interactions in the auxiliary optical modes and tunneling coupling between optical cavity modes can significantly manipulate the optical responses of the system to the probe field.When two optical cavities are driven by the red-detuned pump fields,there is an inhibition relationship between the optomechanical interaction between the two cavities,so the optical field of the auxiliary cavity can indirectly suppress the energy-level transition process in the main optical cavity.When the pump field in the auxiliary optical cavity is adjusted to the blue-detuned regime,the photons in the auxiliary optical cavity and the phonons in the mechanical resonator are excited,which promotes the energy-level transition process in the main optical cavity.When the tunneling interaction is considered,exceptional point representing extremely optical amplification effect is observed.Furthermore,by adjusting the tunneling coupling strength and power of a blue detuning laser in the auxiliary optical mode,excellent fastslow light effects and the conversion between fast light and slow light are investigated.The optomechanically induced Faraday effect are investigated in a cavity optomechanical system consisting of two cavities,which are containing two degenerate and orthogonal optical modes.It is found that the polarization pump field can control the vector properties of the polarization transmitted light field,and two orthogonal polarized modes are separated.The optical mode conversion mediated by the optomechanical interaction between the optical cavity and the mechanical resonator can be realized to manipulate the vector properties of the photon.The optomechanically induced Faraday effect is confirmed by the conversion of the polarization state.In addition,the splitting effect can be verified by the energy-level splitting of two orthogonal polarization modes.In addition,conversion between linearly polarized and circularly polarized modes is explored,and the chiral symmetry of two mutually orthogonal polarization output fields is observed.The optical mode orthogonal to the polarization pump field is controlled by the tunneling interaction,which ensures the complete polarization control of any specific polarization probe field.By using the polarization pump field in the auxiliary optical cavity,the polarization conversion efficiency can be enhanced effectively,which effectively inhibits the polarized output component parallel to the probe input field,and the probe output component orthogonal to the probe input field can be effectively amplified by the gain of auxiliary optical cavity.Finally,different optical control under different polarization states is studied,which provides an effective scheme for the realization of optical isolator.In an optomechanical system consisting of an optical cavity and two mechanical resonators,the optomechanically induced Faraday effect controlled by mechanical driving and coulomb coupling is studied.To effectively improve the ability of system to manipulate the photon vector properties,we introduce coherent mechanical driving into the mechanical resonator,and the excited phonons can significantly improve the polarization conversion efficiency of the probe field.Even at the lower pump power,the perfect polarized mode conversion can be effectively guaranteed,which brings significant practical advantages and makes effective polarization optical mode conversion feasible experimentally.At the same time,the optical loss in the polarization conversion process is completely avoided,which ensures the effective transmission of a weak signal field in the transmission process of multiple optical devices.Using the mechanical driving scheme,the frequency shift can be avoided by manipulating spin angular momentum of photons.In a non-Hermitian cavity magnomechnaical system,we propose a scheme to engineer phonon laser with dissipative magnon-phonon coupling.The exceptional point(the analog of the party-time symmetric),emerging in the system and changing the properties of photons,magnons,and phonons,can be observed with a tunable dissipative magnonphoton coupling caused by the cavity Lenz’s law.Moreover,we find that at the exceptional point,a strong nonlinear relation appears between the mechanical amplification factor and the detuning parameter,which results in a dramatic enhancement of magnetostrictive force and mechanical gain.Therefore,the highly efficient phonon laser and the ultralow threshold power be produced in the system.Furthermore,exceptional point induced by dissipative coupling is flexible and tunable compared to the party-time symmetric regime,and the ultralow threshold power phonon laser is immune to the loss rates of the photon and magnon modes.