论文标题
基于山谷光子晶体的可调边缘状态的波长划分设备的设计
Design of wavelength division multiplexing devices based on tunable edge states of valley photonic crystals
论文作者
论文摘要
波长施用多路复用（WDM）设备是光子整合电路（图片）的关键要素。基于硅波导和光子晶体的常规WDM设备由于缺陷引起强的向后散射引入的高损失，因此具有有限的透射率。此外，减少这些设备的足迹是一项挑战。在这里，我们从理论上展示了基于全丝硅拓扑谷光子晶体（VPC）结构的电信范围内的WDM设备。我们通过调整硅基板晶格的物理参数来调整其有效折射率，该硅基底物可以连续调整拓扑边缘状态的工作波长范围，从而允许设计具有不同通道的WDM设备。 WDM设备具有两个通道（1470 nm-1523 nm和1548 nm-1609 nm），对比度分别为22.4 dB和24.9 dB。操纵拓扑边缘状态的工作带宽的原理通常可以应用于设计不同的可集成光子设备，因此它将找到广泛的应用。
Wavelength division multiplexing (WDM) devices are key elements of Photonic integrated circuits (PICs). Conventional WDM devices based on silicon waveguides and photonic crystals have limited transmittance due to high loss introduced by the strong backward scattering from defects. In addition, it is challenging to reduce the footprint of those devices. Here we theoretically demonstrate a WDM device in the telecommunication range based on all-dielectric silicon topological valley photonic crystal (VPC) structures. We tune its effective refractive index by tuning the physical parameters of the lattice in the silicon substrate, which can continuously tune the working wavelength range of the topological edge states, which allows designing WDM devices with different channels. The WDM device has two channels (1470 nm-1523 nm and 1548 nm-1609 nm), with contrast ratios of 22.4 dB and 24.9 dB, respectively. The principle of manipulating the working bandwidth of the topological edge states can be generally applied in designing different integratable photonic devices, thus it will find broad applications.
