中国物理B ›› 2023, Vol. 32 ›› Issue (12): 124201-124201.doi: 10.1088/1674-1056/acddd3

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Tailoring topological corner states in photonic crystals by near- and far-field coupling effects

Zhao-Jian Zhang(张兆健)1,2,†, Zhi-Hao Lan(兰智豪)3, Huan Chen(陈欢)1,2, Yang Yu(于洋)1,2, and Jun-Bo Yang(杨俊波)1,2,‡   

  1. 1 Department of Physics, National University of Defense Technology, Changsha 410073, China;
    2 Center of Material Science, National University of Defense Technology, Changsha 410073, China;
    3 Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom
  • 收稿日期:2023-05-22 修回日期:2023-06-03 接受日期:2023-06-13 出版日期:2023-11-14 发布日期:2023-11-22
  • 通讯作者: Zhao-Jian Zhang, Jun-Bo Yang E-mail:zhangzhaojian@nudt.edu.cn;yangjunbo@nudt.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.62275271, 12272407, and 62275269), the National Key Research and Development Program of China (Grant No.2022YFF0706005), the Natural Science Foundation of Hunan Province, China (Grant Nos.2023JJ40683, 2022JJ40552, and 2020JJ5646), and the Program for New Century Excellent Talents in University, China (Grant No.NCET-12-0142).

Tailoring topological corner states in photonic crystals by near- and far-field coupling effects

Zhao-Jian Zhang(张兆健)1,2,†, Zhi-Hao Lan(兰智豪)3, Huan Chen(陈欢)1,2, Yang Yu(于洋)1,2, and Jun-Bo Yang(杨俊波)1,2,‡   

  1. 1 Department of Physics, National University of Defense Technology, Changsha 410073, China;
    2 Center of Material Science, National University of Defense Technology, Changsha 410073, China;
    3 Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom
  • Received:2023-05-22 Revised:2023-06-03 Accepted:2023-06-13 Online:2023-11-14 Published:2023-11-22
  • Contact: Zhao-Jian Zhang, Jun-Bo Yang E-mail:zhangzhaojian@nudt.edu.cn;yangjunbo@nudt.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.62275271, 12272407, and 62275269), the National Key Research and Development Program of China (Grant No.2022YFF0706005), the Natural Science Foundation of Hunan Province, China (Grant Nos.2023JJ40683, 2022JJ40552, and 2020JJ5646), and the Program for New Century Excellent Talents in University, China (Grant No.NCET-12-0142).

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摘要： We explore the behaviors of optically coupled topological corner states in supercell arrays composed of photonic crystal rods, where each supercell is a second-order topological insulator. Our findings indicate that the coupled corner states possess nondegenerate eigenfrequencies at the Γ point, with coupled dipole corner states excited resonantly by incident plane waves and displaying a polarization-independent characteristic. The resonance properties of coupled dipole corner states can be effectively modulated via evanescently near-field coupling, while multipole decomposition shows that they are primarily dominated by electric quadrupole moment and magnetic dipole moment. Furthermore, we demonstrate that these coupled corner states can form surface lattice resonances driven by diffractively far-field coupling, leading to a dramatic increase in the quality factor. This work introduces more optical approaches to tailoring photonic topological states, and holds potential applications in mid-infrared topological micro-nano devices.

关键词: topological corner states, photonic crystal slabs, optical coupling effects, surface lattice resonances

Abstract: We explore the behaviors of optically coupled topological corner states in supercell arrays composed of photonic crystal rods, where each supercell is a second-order topological insulator. Our findings indicate that the coupled corner states possess nondegenerate eigenfrequencies at the Γ point, with coupled dipole corner states excited resonantly by incident plane waves and displaying a polarization-independent characteristic. The resonance properties of coupled dipole corner states can be effectively modulated via evanescently near-field coupling, while multipole decomposition shows that they are primarily dominated by electric quadrupole moment and magnetic dipole moment. Furthermore, we demonstrate that these coupled corner states can form surface lattice resonances driven by diffractively far-field coupling, leading to a dramatic increase in the quality factor. This work introduces more optical approaches to tailoring photonic topological states, and holds potential applications in mid-infrared topological micro-nano devices.

Key words: topological corner states, photonic crystal slabs, optical coupling effects, surface lattice resonances

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.55.Tv (Photonic crystal lasers and coherent effects)