Analysis of Anapole States in Dielectric Spheres and Application to Near-Field Enhancement

Autor:	Yizhang Li, Souvik Agasti, Utpal Dey, Jan Hesselbarth
Rok vydání:	2022
Předmět:	Physics Condensed matter physics Electric field Mie scattering Isotropy Physics::Optics Near and far field SPHERES Physics::Atomic Physics Dielectric Electrical and Electronic Engineering Material properties Microwave
Zdroj:	IEEE Transactions on Antennas and Propagation. 70:1144-1156
ISSN:	1558-2221 0018-926X
DOI:	10.1109/tap.2021.3111312
Popis:	Anapole states in isolated, homogeneous and isotropic dielectric spheres are studied theoretically in accordance with Mie theory, numerically by full-wave electromagnetic simulations and by measurements at microwave and millimeter-wave frequency. Depending on size and material properties of the dielectric spheres, the practical limitations of detection and possible applications of non-radiating anapole states are investigated. The electromagnetic signature, generated by anapole states of a spherical dielectric scatterer, in terms of finite extinction cross-section, is verified by measurements, for both its electric and magnetic versions, in Silicon and Alumina spheres, respectively. In addition, the existence and the detection of higher-order and hybrid anapole states are demonstrated. Finally, an approach to engineer electric field hotspots in a subwavelength-sized gap between two magnetic anapole coupled Alumina ceramic spheres is demonstrated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e2e128bb22fa2cde0c50e5195ed36c47 https://doi.org/10.1109/tap.2021.3111312 Zobrazit plný text záznamu