Enhancing the Goos-Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings  

作　　者：江孝伟 方彬 占春连 Xiaowei Jiang;Bin Fang;Chunlian Zhan(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China;College of Information Engineering,Quzhou College of Technology,Quzhou 324000,China)

机构地区：[1]College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China [2]College of Information Engineering,Quzhou College of Technology,Quzhou 324000,China

出　　处：《Chinese Physics B》2024年第3期393-400,共8页中国物理B（英文版）

基　　金：Project supported by the Zhejiang Provincial Natural Science Foundation of China(Grant No.LQ23F040001);the National Natural Science Foundation of China(Grant No.12204446);the Public Welfare Technology Research Project of Zhejiang Province(Grant No.LGC22E050006);the Quzhou Science and Technology Project of China(Grant No.2022K104).

摘　　要：Quasi-bound state in the continuum(QBIC)resonance is gradually attracting attention and being applied in Goos-Hänchen(GH)shift enhancement due to its high quality(Q)factor and superior optical confinement.Currently,symmetry-protected QBIC resonance is often achieved by breaking the geometric symmetry,but few cases are achieved by breaking the material symmetry.This paper proposes a dielectric compound grating to achieve a high Q factor and high-reflection symmetry-protectede QBIC resonance based on material asymmetry.Theoretical calculations show that the symmetry-protected QBIC resonance achieved by material asymmetry can significantly increase the GH shift up to-980 times the resonance wavelength,and the maximum GH shift is located at the reflection peak with unity reflectance.This paper provides a theoretical basis for designing and fabricating high-performance GH shift tunable metasurfaces/dielectric gratings in the future.

关 键 词：bound state in the continuum Goos-Hänchen shift dielectric compound grating material asymmetry 

分 类 号：O43[机械工程—光学工程]