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在实验上研究了共振于铯原子跃迁线附近的微环芯腔与锥形纳米光纤的耦合特性。通过精密控制微环芯腔与锥形纳米光纤的相对位置,实现了两者的欠耦合、临界耦合和过耦合的精确控制。当微环芯腔与锥形纳米光纤间距为0.6μm时,系统达到临界耦合,透射率为0.3%±0.3%,耦合效率为99.7%±0.3%。由微环芯腔透射光谱得到微环芯腔的自由光谱区为1067±5GHz,等效腔长为223±1μm,线宽为2.9±0.1GHz,本征品质因数为(6.2±0.6)×10~4。随着微环芯腔与锥形纳米光纤间距的减小,微环芯腔的线宽逐渐增大,共振频率发生红移,频率移动为19.2±0.1GHz。该研究找到了有效控制微环芯腔与锥形纳米光纤耦合状态的方法,为下一步实现微环芯腔与原子间强耦合奠定了实验基础。同时该研究加深了人们对微环芯腔不同耦合状态的认识,为研究欠耦合和过耦合状态提供了实验基础。
The coupling characteristics of the microring core cavity with the tapered nanofiber resonant near the cesium atom transition line have been experimentally studied. By precisely controlling the relative positions of the micro-ring core cavity and the tapered nano-fiber, the under-coupling, the critical coupling and the over-coupling are precisely controlled. When the distance between the micro-ring core cavity and the tapered nano-fiber is 0.6μm, the system achieves a critical coupling with a transmittance of 0.3% ± 0.3% and a coupling efficiency of 99.7% ± 0.3%. The results showed that the free spectral region of the microcirculation core cavity was 1067 ± 5GHz, the equivalent cavity length was 223 ± 1μm, the linewidth was 2.9 ± 0.1GHz and the intrinsic quality factor was (6.2 ± 0.6) × 10 ~ 4. With the decrease of the distance between the micro-ring cavity and the tapered nano-fiber, the line width of the micro-ring core cavity gradually increases, and the resonance frequency shifts by a frequency of 19.2 ± 0.1 GHz. The research has found a way to effectively control the coupling state between the micro-ring core and the tapered nano-fiber, which lays the foundation for the further realization of the strong coupling between the micro-ring core and the atom. At the same time, this study deepens the understanding of the different coupling states of the microcirculation core cavity and provides the experimental basis for the research on the state of under coupling and over coupling.