Opt Lett. 2022 Nov 1;47(21):5650-5653. doi: 10.1364/OL.475372.
In this paper, we use a phoxonic crystal (PxC) which can control the topological states of light and sound by breaking inversion symmetry and thus make it possible to achieve rainbow trapping of light and sound simultaneously. It is shown that topologically protected edge states can be obtained at the interfaces between PxCs with different topological phases. Thus, we designed a gradient structure to realize the topological rainbow trapping of light and sound by linearly modulating the structural parameter. In the proposed gradient structure, the edge states of light and sound modes with different frequencies are respectively trapped at different positions, owing to near zero group velocity. The topological rainbows of light and sound are simultaneously realized in one structure, which open a new, to the best of our knowledge, view and provide a feasible platform for the application of the topological optomechanical devices.
在本文中，我们使用了一种声子晶体（PxC），它可以通过打破反转对称性来控制光和声音的拓扑状态，从而实现光和声的同时彩虹捕获。结果表明，在具有不同拓扑相的 PxC 之间的界面上可以获得拓扑保护的边缘态。因此，我们设计了一种梯度结构，通过线性调制结构参数来实现光和声的拓扑彩虹捕获。在提出的梯度结构中，由于群速度接近零，不同频率的光和声音模式的边缘态分别被捕获在不同的位置。光和声的拓扑彩虹在一个结构中同时实现，这开辟了一个新的视角，为拓扑光机械器件的应用提供了一个可行的平台。
