光纤腔耦合碳化硅薄膜的理论计算  

Theoretical calculation of fiber cavity coupling silicon carbide membrance

作　　者：周继阳 李强 许金时[1,2] 李传锋[1,2] 郭光灿[1,2] Zhou Ji-Yang;Li Qiang;Xu Jin-Shi;Li Chuan-Feng;Guo Guang-Can(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China)

机构地区：[1]中国科学技术大学,中国科学院量子信息重点实验室,合肥230026 [2]中国科学技术大学,中国科学院量子信息与量子科技创新研究院,合肥230026 [3]中国科学院上海微系统与信息技术研究所,信息功能材料国家重点实验室,上海200050

出　　处：《物理学报》2022年第6期42-50,共9页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2016YFA0302700);国家自然科学基金(批准号:61725504,U19A2075,61905233,11774335,11821404,11975221);中国科学院前沿科学重点研究项目(批准号:ZDRW-XH-2019-1);安徽量子信息前沿计划(批准号:AHY060300,AHY020100);中央高校基本科研业务费专项资金(批准号:WK2030380017,WK2470000026);中国博士后科学基金(批准号:BX20200326,2021M693099)资助的课题.

摘　　要：半导体材料中的自旋色心是量子信息处理的理想载体,引起了人们的广泛兴趣.近几年,研究发现碳化硅材料中的双空位、硅空位等色心具有与金刚石中的氮-空位色心相似的性质,而且其荧光处于更有利于光纤传输的红外波段.然而受限于这类色心的荧光强度和谱线宽度,它们在量子密钥分发和量子网络构建等方面的实际应用依然面临严峻的挑战.利用光学腔耦合自旋色心实现荧光增强和滤波将能有效地解决这些难题.将光纤端面作为腔镜,并与自旋色心耦合可以实现小模式体积的腔耦合,而且天然地避免了需要再次将荧光耦合进光纤而造成损耗的缺点.本文理论计算了耦合碳化硅薄膜的光纤腔的性质和特征.首先通过优化各项参数包括薄膜表面粗糙度、腔镜反射率等,理论分析了存在于光纤腔中的不同模式的特点,以及光纤腔耦合色心的增强效果及相关影响因素.进一步地研究了对开放腔而言最主要的影响因素——振动对腔性质、色心的增强效果以及耦出效率的影响,最终得到在不同振动下的最大增强效果以及对应的耦出透射率.这些结果为今后光纤腔耦合色心的实验设计提供了最直接的理论指导,为实验的发展和优化指明了方向.Single spin color centers in solid materials are one of the promising candidates for quantum information processing,and attract a great deal of interest.Nowadays,single spin color centers in silicon carbide,such as divacancies and silicon vacancies have been developed rapidly,because they not only have similar properties of the NV centers in diamond,but also possess infrared fluorescence that is more favorable for transmission in optical fiber.However,these centers possess week fluorescence with broad spectrum,which prevents some key technologies from being put into practical application,such as quantum key distribution,photon-spin entanglement,spin-spin entanglement and quantum sensing.Therefore,optical resonator is very suitable for coupling centers to filter their spectrum and enhance the fluorescence by Purcell effect.It is very advantageous to use the fiber end face as cavity mirrors,thereby the fiber can provide small cavity volume corresponding to a large enhancement in spin color centers,and collect the fluorescence in cavity simultaneously,which has no extra loss in comparison with other collection methods.In this work,the properties and performance of fiber Fabry-Perot cavity coupling silicon carbide membrane are mainly studied through theoretical calculation.Firstly,some parameters are optimized such as membrane roughness and mirror reflection by calculating the mode of the fiber cavity and enhancing the color centers coupling into the cavity,then analyzing the properties of different modes in cavity,the enhancement effect on cavity coupling color centers,and other relevant factors affecting the cavity coupling color centers.Next,the influences of dominated factor and vibration on the properties of the cavity,the enhancement and outcoupling of centers coupled into the cavity are investigated,and finally the optimal outcoupling efficiency corresponding to different vibration intensities is obtained.These results give direct guidance for the further experimental design and direction for optimization of t

关 键 词：自旋色心 光纤腔 碳化硅薄膜 

分 类 号：O413[理学—理论物理] TB383.2[理学—物理]