Tuning the magnetic toroidal dipole response in dielectric metasurfaces

Author:

Wang Xinfeng,Chen Deliang1,Ma Wenbin,You Shaojun2,Zhou Mimi,Wang Liyang,Zhang Qing,Luo Shengyun2,Zhou ChaobiaoORCID

Affiliation:

1. Guizhou Education University

2. Guizhou Minzu University

Abstract

A toroidal dipole is a fundamental electromagnetic excitation independent of electric and magnetic dipoles. At present, a great deal of attention has been paid to the characteristics and applications of electric toroidal dipole resonance, while investigation of magnetic toroidal dipole (MTD) resonance is limited. The dielectric metasurface provides a good platform for the excitation of MTD. In this work, we numerically study the MTD response on a silicon tetramer metasurface. The near-field distribution and multipole decomposition fully confirm that the MTD dominates the resonance mode. Also, by integrating the phase-change material G e 2 S b 2 T e 5 film onto this metasurface, the modulation properties of relative transmission, MTD far-field scattering, phase, and local electric and magnetic fields of this hybrid device are effectively studied. The maximum modulation depth of transmission reaches 88%, which is attributed to the strong resonance of MTD. Our work provides a route for the achievement of actively tunable optical nano-devices.

Funder

National Natural Science Foundation of China

Guizhou Provincial Science and Technology Projects

Natural Science Foundation of Guizhou Minzu University

Science and Technology Talent Support Project of the Department of Education in the Guizhou Province

Construction Project of Characteristic Key Laboratory in Guizhou Colleges and Universities

Key laboratory of Guizhou Minzu University

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics

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