耦合非全同微盘：避免能级交叉和单向远场发射
Coupled non-identical microdisks: avoided crossing of energy levels and unidirectional far-field emission
摘要：
我们研究了两个半径不同的耦合微盘的能级参量演化和单向远场发射。我们证明了能级的演化是由避免交叉固有地与例外点或非厄米简并。这些光谱特性解释了共振模式的高度非对称近场强度图案。观察到的单向远场发射示出理解通过考虑禁止的盘间耦合的光线图片由两个盘之间的最近点附近的受抑全内反射时，盘间的距离是足够小的。
英文摘要：
We investigate two coupled microdisks with non-identical radii focusing on the parametric evolution of energy levels and the unidirectional far-field emission. We show that the evolution of energy levels is characterized by the avoided crossing intrinsically associated with the exceptional point or the non-Hermitian degeneracy. These spectral properties explain highly asymmetric near-field intensity pattern of the resonance mode. The observed unidirectional far-field emission is shown to be understood by considering the forbidden inter-disk coupling in the ray picture induced by the frustrated total internal reflection near the closest point between two disks when the inter-disk distance is small enough.
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