The missing link between standing- and traveling-wave resonators
The missing link between standing- and traveling-wave resonators
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DOI：
10.1515/nanoph-2022-0304
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发表时间：
2022-08
期刊：
影响因子：
7.5
通讯作者：
Q. Zhong;Haoqi Zhao;Liang Feng;K. Busch;Ş. Özdemir;R. El-Ganainy
中科院分区：
文献类型：
--
作者：
Q. Zhong;Haoqi Zhao;Liang Feng;K. Busch;Ş. Özdemir;R. El-Ganainy
光学谐振器是利用波干涉和反馈来限制光在所有三个维度的结构。根据反馈机制的不同，谐振器可以支持驻波或行波模式。多年来，这两种不同类型模式之间的区别已经变得如此普遍，以至于现在它是分类光学谐振器的主要特征之一。在这里，我们表明在这两个截然不同的群体之间存在着一种中间联系。特别是，我们引入了一类新的支持混合光模式的光子谐振器，即在谐振器的一个位置，与模式相关的电磁场具有纯粹的驻波模式，而在不同的位置，相同模式的场代表纯粹的行波。所提出的概念是通用的，可以使用芯片级光子学和自由空间光学来实现。此外，它还可以推广到其他波现象，如微波和声学。
Abstract Optical resonators are structures that utilize wave interference and feedback to confine light in all three dimensions. Depending on the feedback mechanism, resonators can support either standing- or traveling-wave modes. Over the years, the distinction between these two different types of modes has become so prevalent that nowadays it is one of the main characteristics for classifying optical resonators. Here, we show that an intermediate link between these two rather different groups exists. In particular, we introduce a new class of photonic resonators that supports a hybrid optical mode, i.e. at one location along the resonator the electromagnetic fields associated with the mode feature a purely standing-wave pattern, while at a different location, the fields of the same mode represent a pure traveling wave. The proposed concept is general and can be implemented using chip-scale photonics as well as free-space optics. Moreover, it can be extended to other wave phenomena such as microwaves and acoustics.