论文标题
虚构耦合诱导的狄拉克点和非重生遗产晶格中的组速度控制
Imaginary coupling induced Dirac points and group velocity control in non-reciprocal Hermitian Lattice
论文作者
论文摘要
我们提出了一种机制，可以通过非晶格晶格中的假想耦合效应实现分叉光的群速度控制。物理模型由每个单元中的两层光子晶格和非重新磁耦合组成，由于遗物性，可以在第一个布里群区域内用一对dirac点支持真实的能量谱。此外，我们表明该系统通过调整耦合强度，在越野点处经历拓扑相变，从而使各个晶格层的左或右边界存在拓扑边缘状态。通过调整虚耦合和波数，可以操纵光波的组速度，并且在零件点和条件下都可以在没有组速度分散的情况下实现分叉光传输。我们的工作可能指导具有组速度控制功能的光子定向耦合器的设计。
We propose a mechanism to achieve the group velocity control of bifurcation light via an imaginary coupling effect in the non-reciprocal lattice. The physical model is composed of two-layer photonic lattices with non-reciprocal coupling in each unit cell, which can support a real energy spectrum with a pair of Dirac points in the first Brillouin zone due to the Hermicity. Furthermore, we show that the systems experience topological phase transition at the Dirac points by tuning the coupling strength, allowing the existence of topological edge states on the left or right boundaries of respective lattice layers. By adjusting the imaginary coupling and the wave number, the group velocity of the light wave can be manipulated, and bifurcation light transmission can be achieved both at the Dirac points and the condition without the group velocity dispersion. Our work might guide the design of photonic directional couplers with group velocity control functions.
