关键词: 光学微腔/
微腔模式/
品质因数/
模式体积
English Abstract
Theoretical analysis of new optical microcavity
Gu Hong-Ming,Huang Yong-Qing,
Wang Huan-Huan,
Wu Gang,
Duan Xiao-Feng,
Liu Kai,
Ren Xiao-Min
1.State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 61574019, 61674018, 61674020) and the Fund of State Key Laboratory of Information Photonics and Optical Communications, China (Grant No. IPOC2017ZZ01).Received Date:10 January 2018
Accepted Date:21 March 2018
Published Online:20 July 2019
Abstract:Optical microcavity can confine light into a small volume by resonant recirculation. Devices based on optical microcavities are already indispensable for a wide range of applications and studies. They not only apply to traditional optics, but also have broad application prospects in quantum information and integrated optoelectronic chips. In quantum optical devices, microcavity can cause atoms or quantum dots to emit spontaneous photons in a desired direction or can provide an environment where dissipative mechanisms such as spontaneous emission are overcome so that quantum entanglement of radiation and matter is possible. For better application in quantum communication, optical microcavity needs to have a high quality factor and a low mode volume. Considering the beam coupling, spot shape and experimental production and others, the Fabry-Perot (F-P) microcavity has been widely applied to the field of optoelectronics. However, the Q-factor of the F-P microcavity is generally low, and the mode volume is large, so it needs to be improved.In addition, high Q-factor microcavity can also play a large role in detecting particles and biological macromolecules.In this paper, through the theory of wave optics, the eigenmodes of a new type of cone-top cylindrical optical micro-cavity are analyzed, and the resonant wavelength expression of the resonant cavity is obtained. We discuss the effects of the top mirror angle on the resonator performance and application of COMSOL simulation software to verify the proposed cone-top cylindrical microcavity. The optimized design and simulation results show that the quality factor of the new resonator can be increased by 22.4% to 49928.5 and the effective mode volume of the resonator can be reduced by 47.8% compared with the traditional parallel resonator. In this case, the corresponding new cavity length is 4.51 μm and the diameter is 3.13 μm. In this article its fabrications are also discussed.
Keywords: optical microcavity/
microcavity mode/
quality factor/
mode volume
