Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

doi:10.1088/1674-1056/ac3bac

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 57802-057802.doi: 10.1088/1674-1056/ac3bac

Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

Bin Liu(刘彬)^1,2, Ma-Long Hu(胡马龙)², Yi-Wen Zhang(章艺文)², Yue You(游悦)², Zhao-Guo Liang(梁钊国)¹, Xiao-Niu Peng(彭小牛)^1,†, and Zhong-Jian Yang(杨中见)^2,‡

1 Hubei Key Laboratory of Ferroelectric and Dielectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, China;
2 Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, China

收稿日期:2021-09-29 修回日期:2021-11-15 发布日期:2022-04-18
通讯作者: Xiao-Niu Peng,E-mail:pengxn@hubu.edu.cn;Zhong-Jian Yang,E-mail:zjyang@csu.edu.cn E-mail:pengxn@hubu.edu.cn;zjyang@csu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.11704416 and 11704107),the Hunan Provincial Natural Science Foundation of China (Grant No.2021JJ20076),and the Hubei Provincial Natural Science Foundation of China (Grant No.2020CFB557).

Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

Bin Liu(刘彬)^1,2, Ma-Long Hu(胡马龙)², Yi-Wen Zhang(章艺文)², Yue You(游悦)², Zhao-Guo Liang(梁钊国)¹, Xiao-Niu Peng(彭小牛)^1,†, and Zhong-Jian Yang(杨中见)^2,‡

1 Hubei Key Laboratory of Ferroelectric and Dielectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, China;
2 Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha 410083, China

Received:2021-09-29 Revised:2021-11-15 Published:2022-04-18
Contact: Xiao-Niu Peng,E-mail:pengxn@hubu.edu.cn;Zhong-Jian Yang,E-mail:zjyang@csu.edu.cn E-mail:pengxn@hubu.edu.cn;zjyang@csu.edu.cn
About author:2021-11-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.11704416 and 11704107),the Hunan Provincial Natural Science Foundation of China (Grant No.2021JJ20076),and the Hubei Provincial Natural Science Foundation of China (Grant No.2020CFB557).

摘要/Abstract

摘要： We theoretically study the near-field couplings of two stacked all-dielectric nanodisks, where each disk has an electric anapole mode consisting of an electric dipole mode and an electric toroidal dipole (ETD) mode. Strong bonding and anti-bonding hybridizations of the ETD modes of the two disks occur. The bonding hybridized ETD can interfere with the dimer's electric dipole mode and induce a new electric anapole mode. The anti-bonding hybridization of the ETD modes can induce a magnetic toroidal dipole (MTD) response in the disk dimer. The MTD and magnetic dipole resonances of the dimer form a magnetic anapole mode. Thus, two dips associated with the hybridized modes appear on the scattering spectrum of the dimer. Furthermore, the MTD mode is also accompanied by an electric toroidal quadrupole mode. The hybridizations of the ETD and the induced higher-order modes can be adjusted by varying the geometries of the disks. The strong anapole mode couplings and the corresponding rich higher-order mode responses in simple all-dielectric nanostructures can provide new opportunities for nanoscale optical manipulations.

关键词: all-dielectric nanodisks, anapole, electric toroidal dipole, magnetic toroidal dipole

Abstract: We theoretically study the near-field couplings of two stacked all-dielectric nanodisks, where each disk has an electric anapole mode consisting of an electric dipole mode and an electric toroidal dipole (ETD) mode. Strong bonding and anti-bonding hybridizations of the ETD modes of the two disks occur. The bonding hybridized ETD can interfere with the dimer's electric dipole mode and induce a new electric anapole mode. The anti-bonding hybridization of the ETD modes can induce a magnetic toroidal dipole (MTD) response in the disk dimer. The MTD and magnetic dipole resonances of the dimer form a magnetic anapole mode. Thus, two dips associated with the hybridized modes appear on the scattering spectrum of the dimer. Furthermore, the MTD mode is also accompanied by an electric toroidal quadrupole mode. The hybridizations of the ETD and the induced higher-order modes can be adjusted by varying the geometries of the disks. The strong anapole mode couplings and the corresponding rich higher-order mode responses in simple all-dielectric nanostructures can provide new opportunities for nanoscale optical manipulations.

Key words: all-dielectric nanodisks, anapole, electric toroidal dipole, magnetic toroidal dipole

中图分类号: (Nanocrystals, nanoparticles, and nanoclusters)

78.67.Bf

42.25.Fx (Diffraction and scattering)

Bin Liu(刘彬), Ma-Long Hu(胡马龙), Yi-Wen Zhang(章艺文), Yue You(游悦), Zhao-Guo Liang(梁钊国), Xiao-Niu Peng(彭小牛), and Zhong-Jian Yang(杨中见). Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks[J]. 中国物理B, 2022, 31(5): 57802-057802.

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Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

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