Strong Coupling Systems Based On Micro/nano-mechanical Resonators

Thanks to the rapid development of micro/nano processing technology in recent years,the manufacturing process and experimental technology of micro/nano mechan-ical resonators have made breakthroughs.Due to its favorable scalability and compat-ibility,this system has a wide range of applications in various fields such as physics,chemistry and biology.Meanwhile,various quantum-mechanical resonator hybrid sys-tems have gradually become popular research.It is foreseeable that this kind of hybrid system will play an important role in the future quantum information technology cen-ter.The role of the bridge.In addition,the research on such hybrid systems will further promote the development of quantum mechanics basic theory,precision measurement,artificial metamaterials and other fields.However,the research fields described above face a huge challenge,that is,it is not yet able to form a sufficient strong coupling between the quantum system and the mechanical resonator.Based on the basic theory of micro/nano mechanical resonators,combined with the relatively complete silicon-based micro/nano device processing technology,we realize a series of classical strong coupling systems with micro/nano mechanical resonators.In this thesis,we built a low temperature experimental platform at liquid helium tem-perature,independently designed and processed the required micro/nano mechanical resonator devices,carried out a series of experiments on classical strong coupling sys-tems,and achieved the following results.1.We use the magnetomotive method to excite and measure the motion state of the micro/nano mechanical resonator at low temperature.At the same time,we designed and improved the processing technology to increase the quality factor up to the magnitude of 105,and constructed strong coupling systems of two or more nearest-coupled mechanical resonators using these high-quality mechanical resonators.2.We realize arbitrary manipulation of the coupling strength in the above system,and constructed an artificial lattice composed of multiple micro/nano mechanical resonators.We have proposed and experimentally verified a proposal for break-ing the reciprocity of lattice,and experimentally demonstrated the unidirectional transmission of radiofrequency signals on millimeter-sized wafers.3.We propose a method for a micro/nano mechanical resonator-atomic point contact hybrid system,and have experimentally verified this method by using chemical bonds between gold atoms.In this hybrid system,the micro/nano mechanical res-onator exhibits a giant strong nonlinear effect.By using this strong nonlinearity,the detection sensitivity of the mechanical resonator is greatly enhanced.The works we have done have broad application prospects in the fields of signal transmission,weak force measurement,macroscopic quantum effect,etc.,and also lay a foundation for the realization of quantum-mechanical resonator strong coupling system in the future.