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arXiv 2112.00151physics.opticscond-mat.other
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双偏振二阶光子拓扑绝缘体

Dual-Polarization Second-Order Photonic Topological Insulators

Yafeng Chen, Fei Meng, Zhihao Lan, Baohua Jia, Xiaodong Huang

摘要:

二阶光子拓扑绝缘体具有高度局域化的角态,对缺陷具有弹性,为开发迷人的光子器件开辟了新的途径。然而,现有的工作对二阶光子拓扑绝缘体主要集中在横向磁或横向电模式。本文通过拓扑优化,提出了一种同时具有横磁模和横电模的双极化拓扑光子晶体结构。通过构造简单的紧束缚晶格模型,以透明的方式揭示了优化后的光子晶体结构的拓扑特征。优化后的双偏振二阶光子拓扑绝缘体具有四组角态,其横磁模和横电模具有不同的轮廓和本征频率.此外,这些角状态对缺陷的鲁棒性被明确证明。我们的研究结果提供了发展偏振无关的拓扑光子器件的机会。

英文摘要:

Second-order photonic topological insulators that host highly localized corner states resilient to defects, are opening new routes towards developing fascinating photonic devices. However, the existing works on second-order photonic topological insulators have mainly focused on either transverse magnetic or transverse electric modes. In this paper, we propose a dual-polarization topological photonic crystal structure for both transverse magnetic and transverse electric modes through topology optimization. Simple tight-binding lattice models are constructed to reveal the topological features of the optimized photonic crystal structure in a transparent way. The optimized dual-polarization second-order photonic topological insulator hosts four groups of corner states with different profiles and eigenfrequencies for both the transverse magnetic and transverse electric modes. Moreover, the robustness of theses corner states against defects is explicitly demonstrated. Our results offer opportunities for developing polarization-independent topological photonic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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