文献类型：期刊文献

英文题名：Passive Nonlinear Optical Isolators Bypassing Dynamic Reciprocity

作者：Hu, Yiqi[1,2];Qi, Yihong[1];You, Yu[1,2];Zhang, Shicheng[1];Lin, Gongwei[1];Li, Xiaolin[1];Gong, Jiangbin[3];Gong, Shangqing[1,4];Niu, Yueping[1,4]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore;[4]Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China

年份：2021

卷号：16

期号：1

外文期刊名：PHYSICAL REVIEW APPLIED

收录：;EI(收录号：20213010668043);WOS:【SCI-EXPANDED(收录号:WOS:000681257600001)】；

基金：This work is supported by the National Natural Sci-ence Foundation of China (Grants No. 11974109, No. 11774089, No. 11874146, No. 11674094, No. 12034007, and No. 61835013) and the Shanghai Natural Sci-ence Foundation (Grants No. 20YF1410800 and No. 18ZR1410500) .

语种：英文

外文关键词：Nonlinear optics - Simulation platform - Microwave isolators

摘要：Magnetic-free optical isolators are critical components for the realization of integrated optical systems. The underlying physics of passive nonlinear optical isolators is not solely about breaking the Lorentz reciprocity without requiring any external bias. Indeed, one major obstacle to the operation of self-Kerr type nonlinear optical isolators is the so-called dynamic reciprocity, of which a serious outcome is that a backward signal cannot be isolated in the presence of a forward strong signal. In this work, we advocate the concept of velocity-selective nonlinearity to bypass such dynamic reciprocity. Using a proof-of-principle platform with warm rubidium atoms in an asymmetric cavity, we experimentally achieve the isolation of a backward signal in the presence of a strong forward signal, with experimental observations in agreement with our theoretical simulations. This work has thus made one essential step towards functioning Kerr-type passive optical isolators.