Nonlinear Control of Electromagnetic Topological Edge States
Nonlinear Control of Electromagnetic Topological Edge States
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DOI：
10.1103/physrevlett.121.163901
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发表时间：
2018-10-18
影响因子：
8.6
通讯作者：
Kivshar, Yu. S.
中科院分区：
文献类型：
--
作者：
Dobrykh, D. A.;Yulin, A. V.;Kivshar, Yu. S.
拓扑光子学是近年来出现的一种实现强健光路的聪明方法，对非线性效应的研究有望为光子拓扑态的可调谐打开大门。在此，我们在实验上实现了泵浦-探测区耦合非线性谐振腔阵列中电磁拓扑边态的非线性诱导光谱调谐。当非线性较弱时，我们观察到谐振器的频谱漂移主要集中在边缘模，对体模的影响很小。对于强抽运，我们描述了几种边缘态的转变及其与体模的杂化，并预言了参数驱动下从拓扑稳定到不稳定动态区域的转变。
Topological photonics has emerged recently as a smart approach for realizing robust optical circuitry, and the study of nonlinear effects is expected to open the door for tunability of photonic topological states. Here we realize experimentally nonlinearity-induced spectral tuning of electromagnetic topological edge states in arrays of coupled nonlinear resonators in the pump-probe regime. When nonlinearity is weak, we observe that the frequencies of the resonators exhibit spectral shifts concentrated mainly at the edge mode and affecting only weakly the bulk modes. For a strong pumping, we describe several scenarios of the transformation of the edge states and their hybridization with bulk modes, and also predict a parametrically driven transition from topological stationary to unstable dynamic regimes.