文献类型：期刊文献

英文题名：Cavity-Free Circulator with Low Insertion Loss Using Hot Atoms

作者：Zhang, Shicheng[1];Lin, Gongwei[1];Hu, Yiqi[1,2];Qi, Yihong[1];Niu, Yueping[1,3];Gong, Shangqing[1]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China

年份：2020

卷号：14

期号：2

外文期刊名：PHYSICAL REVIEW APPLIED

收录：;EI(收录号：20204109309575);WOS:【SCI-EXPANDED(收录号:WOS:000560631000002)】；

基金：This work is supported by the National Natural Science Foundation of China (Grants No. 11974109, No. 11674094, and No. 11774089) and Shanghai Natural Science Foundation (Grants No. 17ZR1442700 and No. 18ZR1410500).

语种：英文

外文关键词：Optical devices - Light transmission - Q factor measurement - Atoms - Insertion losses

摘要：Nonreciprocal optical devices, such as isolators and circulators, provide highly desirable functionalities in routing signals. This motivates the active research on high-efficiency nonreciprocal devices, especially for miniaturized and integrable magnetic-free schemes. All the present experimental demonstrations of circulators in optical domains are based on the high-Q factor cavity. In this work, we demonstrate a cavity-free optical circulator with low insertion loss by making use of a far-detuned nonlinear Raman process with the assistance of the atomic Doppler effect. Due to the large detuning, the excited state can be adiabatically eliminated, resulting in nearly vanishing absorption. An optical circulator with average transmission of more than 85% and fidelity above 0.98 is well achieved in an experiment with hot atoms. Our scheme shows the possibility of cavity-free nonreciprocal optical devices with low insertion loss.