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arXiv 1601.01375physics.optics
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耦合微腔中的PT对称性破缺与非线性光学隔离

PT Symmetry Breaking and Nonlinear Optical Isolation in Coupled Microcavities

Xin Zhou, Yidong Chong

备注：
15 pages, 8 figures
发表信息：
Optics Express 24, 6916 (2016)
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摘要：

本文对具有增益和损耗的耦合微腔非线性光隔离器进行了理论研究。使用耦合模理论，我们推导出一个对应的边界之间的渐近稳定的非线性政权，增益饱和的存在，和PT打破过渡的基本线性系统。对于零失谐和弱输入强度，可以严格推导出光隔离的起始点，并精确对应于PT转变点。当到外部端口的耦合不相等时，隔离比在过渡点处表现出由耦合比确定的突变。这可以被利用来实现主动控制的非线性光学隔离器，其中可以使用谐振器间分离的微小变化来打开或关闭强光学隔离。

英文摘要：

We perform a theoretical study of nonlinear optical isolator devices based on coupled microcavities with gain and loss. Using coupled-mode theory, we derive a correspondence between the boundary of asymptotic stability in the nonlinear regime, where gain saturation is present, and the PT-breaking transition in the underlying linear system. For zero detuning and weak input intensity, the onset of optical isolation can be rigorously derived, and corresponds precisely to the PT transition point. When the couplings to the external ports are unequal, the isolation ratio exhibits an abrupt jump at the transition point, determined by the ratio of the couplings. This could be exploited to realize an actively controlled nonlinear optical isolator, in which strong optical isolation can be switched on or off using tiny variations in the inter-resonator separation.

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