Floquet-Lieb拓扑光子绝缘体的宽边态超连续介质

IF 5.4 1区 物理与天体物理 Q1 OPTICS APL Photonics Pub Date : 2023-10-01 DOI:10.1063/5.0160174
Hanfa Song, Tyler J. Zimmerling, Bo Leng, Vien Van
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引用次数: 0

摘要

传统的拓扑光子绝缘体通常具有狭窄的非平凡带隙,被宽色散体带截断,导致有限的边缘模式传输带宽,可以用于潜在的应用。在这里,我们展示了一个具有所有平坦带的Floquet-Lieb拓扑光子绝缘体,该绝缘体可以支持跨多个floquet -布里渊区域的连续边缘模式传输。这种边缘态的超连续统是由局域平带模式和边缘态的共存和正交性造成的,允许后者的连续激发而不会散射到体模中。此外,我们表明,无论扰动有多大,这些平坦带都完全不受现场电位随机变化的影响,从而确保边缘模式对这种类型的紊乱具有完全的鲁棒性。我们利用具有完美近邻耦合的二维微环谐振格实现了Floquet-Lieb绝缘子。透射测量和散射光分布的直接成像显示了一个边缘模式超连续体,跨越了三个以上的微环自由光谱范围。所提出的Floquet-Lieb绝缘体可以用于实现具有宽带和超鲁棒性的拓扑光子器件,用于集成量子光子学和可编程光子电路。
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Wide edge state supercontinuum in a Floquet–Lieb topological photonic insulator
Conventional topological photonic insulators typically have narrow nontrivial band gaps truncated by broad dispersive bulk bands, resulting in limited edge mode transmission bandwidths that can be exploited for potential applications. Here, we demonstrate a Floquet–Lieb topological photonic insulator with all flat bands that can support continuous edge mode transmission across multiple Floquet–Brillouin zones. This supercontinuum of edge states results from the coexistence and orthogonality of the localized flat-band modes and the edge states, allowing for continuous excitation of the latter without scattering into the bulk modes. Moreover, we show that these flat bands are perfectly immune to random variations in the on-site potential, regardless of how large the perturbations are, thus ensuring complete robustness of the edge modes to this type of disorder. We realized Floquet–Lieb insulators using 2D microring resonator lattices with perfect nearest-neighbor couplings. Transmission measurements and direct imaging of the scattered light distributions showed an edge mode supercontinuum spanning more than three microring free spectral ranges. The proposed Floquet–Lieb insulator can potentially be used to realize topological photonic devices with wide bandwidths and super robustness for applications in integrated quantum photonics and programmable photonic circuits.
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来源期刊
APL Photonics
APL Photonics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍: APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.
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