| The interaction of light and matter has always been a very important topic in the field of optics.With the continuous research of opto-mechanical devices,the optical micro-cavity can reach the nano-scale at the highest.Because the mechanical oscillator in the micro-cavity has an extremely small mass,so that it can exhibit pure quantum effects when it is photon-coupled with the cavity membrane.At present,the research in the field of cavity opto-mechanics involves many different systems,and nanomechanical resonators have been rapidly developed in various fields,among which the cavity magneto-mechanical system has become a key component to realize quantum coherence and coupling between magnons,cavity photons and phonons.new platform.Both electrostatic and piezoelectric forces can couple phonons and microwave photons,but they both inherently lack good tunability.The emergence of magnetostrictive force provides us with a new way to realize different information carriers.Introducing the YIG sphere as an efficient mechanical resonator into the air-magnetic mechanical system,the magnetization change induced by the excitation of magnons in the YIG sphere leads to the geometric deformation of the surface,introducing the coupling of magnon mode and phonon mode.YIG has rich magnetic nonlinearity and low loss properties in different information carriers,and these excellent properties make it possible to discover many interesting and important phenomena in cavity magnetodynamic systems and other quantum systems.The first chapter is the introduction.First of all,we make a brief introduction to the development process of nanomechanical systems at home and abroad,and introduce several typical optomechanical systems on this basis.In the second chapter,the theory proposes a magneto-optical system including magnon-phonon-photon interaction,which consists of a magnon(YIG sphere)and an optical resonant cavity.In this system,magnons are presented by the collective motion of a large number of spins in a macroscopic ferrimagnet,and magnons and photons are coupled through magnetic dipole interactions,and magnons and phonons are coupled through magnetostrictive interactions.Through rigorous quantum optics theory and input-output relation theory,the coherent optical transmission properties in this department are studied.By controlling the parametric mechanism in the department to achieve effective regulation of the output field,the department provides a promising platform for the study of macroscopic quantum phenomena.In the third chapter,on the basis of the second chapter,a magneto-optical mechanical system with dual resonator mode is theoretically proposed.In this system,the left and right optical resonators are both composed of a strong pump field and a Weak detection field drive,in which the left resonator has a mechanical vibration mode and is coupled with a magnon(yttrium iron garnet sphere),and there is mutual coupling between the optical fields of the two resonators.By controlling the ratio of the detection field strength on both sides of the system,the coupling strength between the magnon and the microwave photon,the coupling strength between the magnon and the mechanical oscillator,and the coupling strength between the left and right resonators,the optomechanical system Phenomena such as mode splitting,perfect quantum phase expansion coherence,perfect quantum destructive coherence,and magnon energy absorption will occur.At the same time,the coupling between the left and right resonators in this system plays a key role,providing a quantum channel and affecting the peak value of the transparent window.By studying and manipulating the parameters in this system,the effective regulation of the output field is achieved,and this research has potential application prospects in quantum information networks.The fourth chapter is the conclusion and outlook.Figure [14] Reference [116]... |
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