Tapered metasurfaces for eliminating up-down asymmetry of quasi-bound states in the continuum resonance

Xu, Hang1; Li, Hui1; Song, Chunyu1; Wang, Silei1; Tan, Qi1; Luo, Li3; Liu, Yanyan4; Zhang, Yating1; Li, Jie3; Yao, Jianquan1,2

2024-02-01

10.1016/j.optlastec.2023.109864

OPTICS AND LASER TECHNOLOGY   Impact Factor & Quartile

0030-3992

1879-2545

Either the bound states in the continuum (BIC) or quasi-BIC structure can be used as Hermitian system when it has up-down symmetry (Cartesian coordinates in the out-plane or z direction), so that BICs is stable. However, out-plane symmetry is not guaranteed in all cases. We take the quasi-BIC structure to enhance the absorption of two-dimensional materials as an example, but not limited to the use of other BIC structures, to solve the problem of the asymmetric quasi-BIC metasurfaces in the z direction. Previously reported works have proposed to control critical coupling light absorption in two-dimensional materials such as monolayer graphene by quasi-BIC metasurfaces. However, in order to apply the quasi-BIC structure in practice, the substrate needs to be added and it will greatly destroy the out-plane symmetry, resulting in the reduction of the original high absorption rate of graphene. To solve the above problems, the tapered structure designed in this paper can recapture the electromagnetic field into the quasi-BIC structure and avoid the leakage of the field into the substrate. This structure maintains the high absorption rate of the original structure on graphene, and the calculated results show that our tapered structure is applicable to different structures and substrates.

Quasi-BIC Tapered metasurfaces Graphene Refractive index matching Light absorption Up -down asymmetry

SCI

English

Corresponding

National Key Research and Development Program of China[2021YFB2800703] ; National Natural Science Foundation of China[U22A2008] ; Laboratory Foundation[2022JCJQLB055006] ; Laoshan Laboratory Science and Technology Innovation Project[LSKJ202200801]

Optics ; Physics

Optics ; Physics, Applied

WOS:001088765000001

ELSEVIER SCI LTD

ENGINEERING

Web of Science

1.Tianjin Univ, Sch Precis Instruments & Optoelect Engn, Key Lab Optoelect Informat Technol, Minist Educ, Tianjin 300072, Peoples R China
2.South Univ Sci & Technol China, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
3.Chengdu Univ Informat Technol, Informat Mat & Device Applicat Key Lab Sichuan Pro, Chengdu 610225, Peoples R China
4.Sci & Technol Electroopt Informat Secur Control La, Tianjin 300308, Peoples R China

Xu, Hang,Li, Hui,Song, Chunyu,et al. Tapered metasurfaces for eliminating up-down asymmetry of quasi-bound states in the continuum resonance[J]. OPTICS AND LASER TECHNOLOGY,2024,169.

Xu, Hang.,Li, Hui.,Song, Chunyu.,Wang, Silei.,Tan, Qi.,...&Yao, Jianquan.(2024).Tapered metasurfaces for eliminating up-down asymmetry of quasi-bound states in the continuum resonance.OPTICS AND LASER TECHNOLOGY,169.

Xu, Hang,et al."Tapered metasurfaces for eliminating up-down asymmetry of quasi-bound states in the continuum resonance".OPTICS AND LASER TECHNOLOGY 169(2024).