中国物理B ›› 2025, Vol. 34 ›› Issue (3): 34202-034202.doi: 10.1088/1674-1056/ada2f0

• • 上一篇    

Symmetry-protected and Brillouin zone folding driven bound states in the continuum in dielectric nanorod arrays for efficient third harmonic generation

Wen-Jing Wang(王文静)1,2, Shi-Jie Liang(梁世杰)1,2, Jia-Qi Zou(邹家祺)1,2, Yan-Yan Huo(霍燕燕)1,2, and Ting-Yin Ning(宁廷银)1,2,†   

  1. 1 Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China;
    2 Collaborative Innovation Center of Light Manipulation and Applications, Shandong Normal University, Jinan 250358, China
  • 收稿日期:2024-08-28 修回日期:2024-12-16 发布日期:2025-02-18
  • 通讯作者: Ting-Yin Ning E-mail:ningtingyin@sdnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174228 and 12274271).

Symmetry-protected and Brillouin zone folding driven bound states in the continuum in dielectric nanorod arrays for efficient third harmonic generation

Wen-Jing Wang(王文静)1,2, Shi-Jie Liang(梁世杰)1,2, Jia-Qi Zou(邹家祺)1,2, Yan-Yan Huo(霍燕燕)1,2, and Ting-Yin Ning(宁廷银)1,2,†   

  1. 1 Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China;
    2 Collaborative Innovation Center of Light Manipulation and Applications, Shandong Normal University, Jinan 250358, China
  • Received:2024-08-28 Revised:2024-12-16 Published:2025-02-18
  • Contact: Ting-Yin Ning E-mail:ningtingyin@sdnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174228 and 12274271).

摘要: Two types of bound states in continuum (BICs), symmetry-protected and Brillouin zone folding driven, are identified in hollow Si nanorod arrays. By modulating the direction and distance of the air holes from the center of the nanorods, it is possible to achieve either a single quasi-BIC or three quasi-BICs. The transmission spectra exhibit ultra-narrow lines, and the quasi-BICs demonstrate ultra-high $Q$ factors. Additionally, efficient third-harmonic generation occurs at low pump intensities. The results indicate that the proposed nanostructures of two types of BICs with a flexible modulation hold great potential applications for nonlinear photonic devices.

关键词: bound states in the continuum, Brillouin zone folding, third harmonic generation

Abstract: Two types of bound states in continuum (BICs), symmetry-protected and Brillouin zone folding driven, are identified in hollow Si nanorod arrays. By modulating the direction and distance of the air holes from the center of the nanorods, it is possible to achieve either a single quasi-BIC or three quasi-BICs. The transmission spectra exhibit ultra-narrow lines, and the quasi-BICs demonstrate ultra-high $Q$ factors. Additionally, efficient third-harmonic generation occurs at low pump intensities. The results indicate that the proposed nanostructures of two types of BICs with a flexible modulation hold great potential applications for nonlinear photonic devices.

Key words: bound states in the continuum, Brillouin zone folding, third harmonic generation

中图分类号:  (Frequency conversion; harmonic generation, including higher-order harmonic generation)

  • 42.65.Ky
42.70.Qs (Photonic bandgap materials) 71.20.-b (Electron density of states and band structure of crystalline solids)