首页|Reversible Optical Isolators and Quasi-Circulators Using a Magneto-Optical Fabry-Pérot Cavity
Reversible Optical Isolators and Quasi-Circulators Using a Magneto-Optical Fabry-Pérot Cavity
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Nonreciprocal optical devices are essential for laser protection,modern optical communication and quan-tum information processing by enforcing one-way light propagation.The conventional Faraday magneto-optical nonreciprocal devices rely on a strong magnetic field,which is provided by a permanent magnet.As a result,the isolation direction of such devices is fixed and severely restricts their applications in quantum networks.In this work,we experimentally demonstrate the simultaneous one-way transmission and unidirectional reflection by using a magneto-optical Fabry-Pérot cavity and a magnetic field strength of 50 mT.An optical isolator and a three-port quasi-circulator are realized based on this nonreciprocal cavity system.The isolator achieves an isolation ratio of up to 22 dB and an averaged insertion loss down to 0.97 dB.The quasi-circulator is realized with a fidelity exceeding 99％and an overall survival probability of 89.9％,corresponding to an insertion loss of～0.46 dB.The magnetic field is provided by an electromagnetic coil,thereby allowing for reversing the light circulating path.The reversible quasi-circulator paves the way for building reconfigurable quantum networks.
张天天、周文鹏、李志向、唐宇涛、许帆、吴浩东、张涵、唐江山、阮亚平、夏可宇
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College of Engineering and Applied Sciences,National Laboratory of Solid State Microstructures,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China
Shenzhen Shaanxi Coal Hi-tech Research Institute Co.,Ltd,Shenzhen 518083,China
School of Physics,Nanjing University,Nanjing 210023,China
Jiangsu Key Laboratory of Artificial Functional Materials,Nanjing University,Nanjing 210023,China
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国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金Program for Innovative Talents and Teams in JiangsuShccig-Qinling Program中国博士后科学基金Jiangsu Funding Program for Excellent Postdoctoral Talent
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