Wide-mode-area slow light waveguides in valley photonic crystal heterostructures

IF 2.8 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Express Pub Date : 2024-05-31 DOI:10.1364/ome.525349

Chengkun Zhang, Yasutomo Ota, Satoshi Iwamoto

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Abstract

We designed slow-light waveguides with a wide mode area based on slab-type valley photonic crystal (VPhC) heterostructures which are composed of a graphene-like PhC sandwiched by two topologically distinct VPhCs. The group velocity of the topological guided mode hosted in a VPhC heterostructure can be slowed down by shifting the VPhC lattice toward the graphene-like PhC at the domain interfaces. Simultaneously, the mode width of the slow-light topological guided mode can be widened by increasing the size of the graphene-like PhC domain. We found that employing the graphene-like structure at the center domain is crucial for realizing a topological single-guided mode in such heterostructures. Furthermore, the impact of random fluctuations in air-hole size in the graphene-like domain was numerically investigated. Our simulation results demonstrate that the transmittance for the slow-light states can be kept high as far as the size fluctuation is small although it drops faster than that for fast-light states when the disorder level increases. The designed wide-mode-area slow-light waveguides are based on hole-based PhCs, offering novel on-chip applications of topological waveguides.

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山谷光子晶体异质结构中的宽模区慢光波导

我们设计的慢光波导具有很宽的模式面积，它基于板状谷光子晶体（VPhC）异质结构，由两个拓扑不同的 VPhC 夹着一个类石墨烯 PhC 组成。通过在畴界面将 VPhC 晶格移向类石墨烯 PhC，可以减慢 VPhC 异质结构中寄存的拓扑导引模式的群速度。同时，通过增大类石墨烯 PhC 域的尺寸，可以拓宽慢光拓扑导引模式的模式宽度。我们发现，在中心畴采用类石墨烯结构是在此类异质结构中实现拓扑单导模的关键。此外，我们还在数值上研究了类石墨烯域中气孔尺寸随机波动的影响。我们的模拟结果表明，只要尺寸波动较小，慢光态的透射率就能保持较高水平，不过当无序度增加时，慢光态的透射率比快光态的透射率下降得更快。所设计的宽模区慢光波导基于孔基 PhC，为拓扑波导提供了新颖的片上应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials Express MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS

CiteScore

5.50

自引率

3.60%

发文量

377

审稿时长

1.5 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optical Materials Express (OMEx), OSA''s open-access, rapid-review journal, primarily emphasizes advances in both conventional and novel optical materials, their properties, theory and modeling, synthesis and fabrication approaches for optics and photonics; how such materials contribute to novel optical behavior; and how they enable new or improved optical devices. The journal covers a full range of topics, including, but not limited to: Artificially engineered optical structures Biomaterials Optical detector materials Optical storage media Materials for integrated optics Nonlinear optical materials Laser materials Metamaterials Nanomaterials Organics and polymers Soft materials IR materials Materials for fiber optics Hybrid technologies Materials for quantum photonics Optical Materials Express considers original research articles, feature issue contributions, invited reviews, and comments on published articles. The Journal also publishes occasional short, timely opinion articles from experts and thought-leaders in the field on current or emerging topic areas that are generating significant interest.