Inverse Design of Dual-Band Valley-Hall Topological Photonic Crystals With Arbitrary Pseudospin States

IF 7.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yuki Sato, Shrinathan Esaki Muthu Pandara Kone, Junpei Oba, Kenichi Yatsugi
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引用次数: 0

Abstract

Valley photonic crystals (VPCs) offer topological kink states that ensure robust, unidirectional, and backscattering-immune light propagation. The design of VPCs is typically based on analogies with condensed-matter topological insulators that exhibit the quantum valley Hall effect; trial-and-error approaches are often used to tailor the photonic band structures and their topological properties, which are characterized by the local Berry curvatures. In this paper, an inverse design framework based on frequency-domain analysis is presented for VPCs with arbitrary pseudospin states. Specifically, the transverse spin angular momentum (TSAM) at the band edge is utilized to formulate the objective function for engineering the desired topological properties. Numerical experiments demonstrate that the proposed design approach can successfully produce photonic crystal waveguides exhibiting dual-band operation, enabling frequency-dependent light routing. The pseudospin-engineering method thus provides a cost-effective alternative for designing topological photonic waveguides, offering novel functionalities.

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具有任意赝自旋态的双带谷-霍尔拓扑光子晶体的逆设计
谷光子晶体(VPCs)提供拓扑扭结状态,确保鲁棒,单向和反向散射免疫光传播。VPCs的设计通常基于与表现出量子谷霍尔效应的凝聚态拓扑绝缘体的类比;试错法通常用于定制光子带结构及其拓扑性质,其特征是局部贝里曲率。本文提出了一种基于频域分析的具有任意伪自旋态的VPCs反设计框架。具体来说,利用带边缘的横向自旋角动量(TSAM)来制定目标函数,以实现所需的拓扑性质。数值实验表明,所提出的设计方法可以成功地产生具有双频工作的光子晶体波导,实现频率相关的光路由。因此,赝自旋工程方法为设计拓扑光子波导提供了一种具有成本效益的替代方法,提供了新的功能。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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