Anapole Mode Sustaining Silicon Metamaterials in Visible Spectral Range

• Published in: Laser & photonics reviews Vol. 12; no. 7
• Main Authors: Ospanova, Anar K., Stenishchev, Ivan V., Basharin, Alexey A.
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-07-2018
• Subjects: anapole mode; Data transfer (computers); Dielectric strength; Dipole moments; Metamaterials; multipolar decomposition; Nanofabrication; optical metamaterials; Silicon; silicon metamaterials; toroidal mode
• ISSN: 1863-8880; 1863-8899
• DOI: 10.1002/lpor.201800005

This paper is dedicated to a type of perforated silicon metamaterials, possessing anapole mode in visible spectral range due to destructive interference between electric and toroidal dipole moments. The proposed structure gains both in attainable material and simplified fabrication. Such a material exhibits a desirable physical effect and has obvious practical application: it supports the anapole mode without complicated 3D toroidal geometry and can be processed in one step by nanofabrication methods. The metamaterial paves the way for advanced optical devices on the base of all‐dielectric metamaterials. Besides inherently low dissipative losses and strong anapole response, such an optical metamaterial can demonstrate subtle sensing, nonradiative data transfer, Aharonov‐Bohm effect and other tempting applications in nanophotonics.
The proposed silicon metamaterial is suitable for optics and gains in simplified fabrication due to one‐step holes perforation and inherent low losses. This work demonstrates another application of silicon metamaterials for anapole mode demonstration, regarding to strong field localization, full transparency and others. These metamaterials are desirable for high‐Q resonators, modulators, cloaking and sensing. A type of silicon metamaterials is illustrated featuring suitable configuration for toroidal response and simplified design.