论文标题
基于非重新磁性四波混合的光学隔离器
Optical isolators based on non-reciprocal four-wave mixing
论文作者
论文摘要
在这项工作中，我们提出并理论上表征了由全磁和非磁性谐振器组成的光学隔离器，该谐振器具有依赖强度的折射率和强大的相干场，并沿单个方向传播。在最先进的集成光子平台中可以直接实现此类设备。基础光学隔离的机制是基于四波混合过程的不对称作用引起的光学互惠的破坏，该过程将强大的泵场与共同传播的信号/闲置模式相连，但没有反向传播。利用与光流体的密切类比，我们提出的隔离机制是从坚固的泵束顶部的集体激发的bogoliubov分散来物理上理解的。对我们提出的一些最相关的设置进行了专门研究，例如相干照明的被动环谐振器和单向激光环或太极谐振器。
In this work we propose and theoretically characterize optical isolators consisting of an all-dielectric and non-magnetic resonator featuring an intensity-dependent refractive index and a strong coherent field propagating in a single direction. Such devices can be straightforwardly realized in state-of-the-art integrated photonics platforms. The mechanism underlying optical isolation is based on the breaking of optical reciprocity induced by the asymmetric action of four-wave mixing processes coupling a strong propagating pump field with co-propagating signal/idler modes but not with reverse-propagating ones. Taking advantage of a close analogy with fluids of light, our proposed isolation mechanism is physically understood in terms of the Bogoliubov dispersion of collective excitations on top of the strong pump beam. A few most relevant set-ups realizing our proposal are specifically investigated, such as a coherently illuminated passive ring resonator and unidirectionally lasing ring or Taiji resonators.
