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

作　　者：Wen-Jing Wang Shi-Jie Liang Jia-Qi Zou Yan-Yan Huo Ting-Yin Ning 王文静;梁世杰;邹家祺;霍燕燕;宁廷银

机构地区：[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

出　　处：《Chinese Physics B》2025年第3期390-398,共9页中国物理B(英文版)

基　　金：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 

分 类 号：TN2[电子电信—物理电子学]