中国物理B ›› 2024, Vol. 33 ›› Issue (3): 34206-034206.doi: 10.1088/1674-1056/acf661
Enhancing the Goos-Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings
Xiaowei Jiang(江孝伟)1,2, Bin Fang(方彬)1,†, and Chunlian Zhan(占春连)1,‡
- 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
Enhancing the Goos-Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings
Xiaowei Jiang(江孝伟)1,2, Bin Fang(方彬)1,†, and Chunlian Zhan(占春连)1,‡
- 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
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.
中图分类号: (Holographic optical elements; holographic gratings)
- 42.40.Eq