论文标题
重新审视PT对称耦合波导中的po弹载体
Revisit the Poynting vector in PT-symmetric coupled waveguides
论文作者
论文摘要
我们表明，在平均时间（PT）对称耦合的波导中，时间平均的Poynting载体始终是正面的，并且无法在特殊点（EPS）上解释停止的光。为了解决这一悖论，我们必须接受以下事实：非热式系统中的e和h和poynting向量是一般复杂的。根据瞬时poynting载体的原始定义，提出了一个关于组速度的公式，该公式与直接从分散曲线计算出的完全吻合。它不仅解释了EPS的停止光，还解释了附近的快速效果。这项调查弥合了经典的电动力学和非炎性物理学之间的差距，并突出了非富甲光学的新颖性。
We show that the time-averaged Poynting vector in parity-time (PT ) symmetric coupled waveguides is always positive and cannot explain the stopped light at exceptional points (EPs). In order to solve this paradox, we must accept the fact that the fields E and H and the Poynting vector in non-Hermitian systems are in general complex. Based on the original definition of the instantaneous Poynting vector, a formula on the group velocity is proposed, which agrees perfectly well with that calculated directly from the dispersion curves. It explains not only the stopped light at EPs, but also the fast-light effect near it. This investigation bridges a gap between the classic electrodynamics and the non-Hermitian physics, and highlights the novelty of non-Hermitian optics.
