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Journal of Applied Optics

Controllable switching between electromagnetically induced absorption and transparency

BAI Xixi, 西安工程大学理学院，陕西西安 710048, WANG Chenjie, TI Haowei, LIU Haogong, YAN Xiang'an

Published Jan 1, 2024• 0 citations

Abstract

在一个非简并三能级梯型原子系统中，通过调谐探测场的强度，从理论和实验上研究了探测场通过铷原子蒸气的传输谱线。当探测场不再足够弱时，通过缀饰微扰链的方法推导了探测场响应的表达式并预言了电磁诱导吸收(electromagnetically induced absorption, EIA)的存在。实验上，在室温铷原子的D2线中，当弱探场状态切换到强探测状态时，不局限于单光子共振条件，电磁感应透明(electromagnetically induced transparency, EIT)向EIA的转换在探测场的不同失谐量处被实现。利用缀饰能级图分析了强的探测场和耦合场产生的二级缀饰态之间的相长干涉是EIA形成的主要原因。由于EIT和EIA的许多应用依赖于共振附近的异常色散，这个结果引入了控制色散符号的新能力。

DOI: 10.5768/jao202445.0310013

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在一个非简并三能级梯型原子系统中，通过调谐探测场的强度，从理论和实验上研究了探测场通过铷原子蒸气的传输谱线。当探测场不再足够弱时，通过缀饰微扰链的方法推导了探测场响应的表达式并预言了电磁诱导吸收(electromagnetically induced absorption, EIA)的存在。实验上，在室温铷原子的D2线中，当弱探场状态切换到强探测状态时，不局限于单光子共振条件，电磁感应透明(electromagnetically induced transparency, EIT)向EIA的转换在探测场的不同失谐量处被实现。利用缀饰能级图分析了强的探测场和耦合场产生的二级缀饰态之间的相长干涉是EIA形成的主要原因。由于EIT和EIA的许多应用依赖于共振附近的异常色散，这个结果引入了控制色散符号的新能力。

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In the present work, a theoretical and experimental study to enhance electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) signals in an 85 R b atomic vapor medium at room temperature is conducted. Also, switching from EIT to EIA signal at a particular value of the magnetic field is observed. Further, by using circularly polarized coupling light, the dispersion profile of the linearly polarized probe signal is investigated theoretically and experimentally. The nine-level system of 85 R b D2 transition in a ladder-type configuration is fully solved by using the density matrix theory. The simulated results are found in good qualitative agreement with experimental observations. Hence, an experimental setup is developed for (1) achieving enhanced EIT and EIA signal, (2) switching from EIT to EIA, and (3) dispersion measurement. These observations have potential applications towards measurement of the group velocity of light, quantum memory, quantum information, and optical switching.

电磁地导致的透明性(EIT ) 技术是为在原子整体并且为在光子之间的相互作用的改进的轻地的量状态的存储的重要工具。在这份报纸，我们简短总结我们的组在一个单个三脚架为光子的极化基于两倍 EIT 效果，存储双隧道的纺纱波浪刺激的量干扰和旋转波浪向量的协调操作在提高的跨阶段的调整上进行的最近的试验性的研究原子系统。这里介绍的工作在量信息处理的发展中的领域里有潜在的申请。

All-optical analogs of electromagnetically induced absorption (EIA) and electromagnetically induced transparency (EIT) are important for light storage, sensing, and optical communication. Here, we report results of a computational study focusing on the EIA and EIT characteristics of triple-microcavity hosting one-dimensional photonic crystals (PHCs). In contrast to previous experimental investigation of dual PHC cavities, realization EIA and EIT in the triple-cavity PHC is not restricted to reflection and transmission, respectively. In addition, the dispersive response of the triple-cavity is also distinct since EIA in the triple-cavity may lead to the generation of both sub- and superluminal light pulses. Furthermore, the dispersion of the system at either output may be reversed by altering the distribution of the coupled light among the three cavities. Finally, we discuss the experimental implementation of these features based on a single monolithic PHC and show tuning of the EIA and EIT phenomenon over a broad spectral range by using strain-tunable polymer-based PHC microcavities. Among others, these findings are advantageous for realizing ultra-narrow bandwidth optical filters, all-optical switching, temporal control of cavity quantum electrodynamics effects, and on-chip dispersion control.