Unconventional modes induced chiral symmetry breaking in optical microcavity
Unconventional modes induced chiral symmetry breaking in optical microcavity
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非常规模式引起光学微腔手性对称性破缺
DOI：
10.1016/j.optlastec.2021.107557
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发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
Qiang Zhang
中科院分区：
文献类型：
--
作者：
Zhiyuan Gu;Qiang Zhang
近十年来，人们对光在光学微腔中的操纵进行了大量的研究。特别是，手性对称性的破坏在信号处理、光学传感和非线性光学等领域有着广泛的应用，是研究的重要目标之一。在此，我们从理论上证明了与F-P腔耦合的微腔中顺时针（CW）和逆时针（CCW）波之间的破缺对称性。通过在部分F-P腔中引入损耗，可以实现具有强局域化的非常规模态。从这个意义上说，外腔的修正模式将不平衡的光强传输到微腔的连续波和连续波中，从而破坏了这两个分量之间的对称性。通过调整F-P腔的损耗可以得到0.925的手性α。利用所产生的手性，在微腔附近放置一个总线波导，实现了无二义性的单向发射。此外，我们的数值结果证实了单向发射对外部扰动（如纳米粒子）表现出超敏感性。通过比较传输到波导两个端口的光强，可以有效地识别小至1 - 7nm的纳米颗粒。我们认为这项工作对于研究非厄米系统的富物理和提高微腔的潜力是必不可少的。
In the past decade, great efforts have been devoted to manipulate lights in optical microcavity. Particularly, breaking the chiral symmetry is one of the essential targets to achieve due to its broad applications in signal processing, optical sensing, and nonlinear optics. Herein, we theoretically demonstrate the broken symmetry between clockwise (CW) and counter-clockwise (CCW) waves in microcavity coupled with a Fabry-Pérot (F-P) cavity. By introducing loss into part of the F-P cavity, the unconventional modes with strong localization can be realized. In this sense, the modified mode of the external cavity will transport unbalanced light intensity into the CW and CCW waves of the microcavity, sequently breaking the symmetry between these two components. The chirality α of 0.925 can be obtained by tuning the loss of the F-P cavity. Leveraging on the generated chirality, unambiguous unidirectional emission is realized when a bus-waveguide is arranged near the microcavity. Furthermore, our numerical results confirm that the unidirectional emission shows ultra-sensitivity to the external perturbations such as nano particles. Nano particles as small as 1–7 nm can be effectively recognized by comparing the light intensity delivered to the two ports of the waveguide. We believe this work is essential for studying the rich physics in non-Hermitian systems and advancing the potentials of microcavity.
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