文献类型：期刊文献

英文题名：Lossless nonreciprocity using dual-Raman interference

作者：Liu, Lifeng[1,2];Zhan, Yifan[1];Zhang, Shicheng[1];Gong, Shangqing[1];Niu, Yueping[1]

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

年份：2025

卷号：33

期号：22

起止页码：46564

外文期刊名：OPTICS EXPRESS

收录：;EI(收录号：20254519457790);WOS:【SCI-EXPANDED(收录号:WOS:001616125100010)】；

基金：Funding. National Natural Science Foundation of China (12034007, 12374327) ; Shanghai Municipal Education Commission (2023ZKZD39) ; Program of Shanghai Academic Research Leader (21XD1400700) .

语种：英文

外文关键词：Light transmission - Optical communication - Phase shift

摘要：Atomic absorption-induced insertion loss poses a fundamental limitation on signal transmission in optical nonreciprocity (ONR) systems. We propose a lossless and magnetic-field-free ONR scheme based on dual-Raman interference in two far-detuned Lambda-type three-level systems. In the forward direction, destructive interference cancels the imaginary part of the susceptibility while retaining a large phase shift, enabling absorption-free transmission. In contrast, Doppler shifts arising from atomic thermal motion disrupt the Raman resonances in the backward direction, suppressing both absorption and phase modulation. This direction-dependent optical response yields nonreciprocal phase shifts which, when implemented in a Mach-Zehnder interferometer, enable an optical isolator with 100% forward transmittance and an isolation of up to 37 dB. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement