From non-scattering to super-scattering with Mie-tronics  

作　　者：HOOMAN BARATI SEDEH NATALIA M.LITCHINITSER 

机构地区：[1]Department of Electrical and Computer Engineering,Duke University,Durham,North Carolina 27708,USA

出　　处：《Photonics Research》2024年第4期608-624,共17页光子学研究（英文版）

基　　金：Army Research Office(W911NF1810348);National Science Foundation(1809518);Office of Naval Research(N00014-20-1-2558)。

摘　　要：Electric anapoles, arising from the destructive interference of primitive and toroidal electric dipole moments, have recently emerged as a fundamental class of non-scattering sources. On the other hand, super-scattering states represent the opposite regime wherein the scattering cross-section of a subwavelength particle exceeds the single-channel limit, leading to a strong scattering behavior. Here, we demonstrate that the interplay between the topology of light and the subwavelength scatterer can lead to these two opposite responses within an isolated alldielectric meta-atom. In particular, we present the emergence of a new non-scattering state, referred to as hybrid anapole, which surpasses conventional electric dipole anapoles by achieving a remarkable 23-fold enhancement in the suppression of far-field radiation and almost threefold enhancement in the confinement of electromagnetic energy inside the meta-atom. We also explore the role of particle orientation and its inversion symmetry in the scattering response and predict the possibility of switching between non-scattering and super-scattering states within the same platform. The presented study elucidates the role of light and matter topologies in the scattering response of subwavelength meta-atoms, uncovering two opposite regimes of light-matter interaction and opening new avenues in applications such as nonlinear optics and spectroscopy.

关 键 词：SPECTROSCOPY opposite DIPOLE 

分 类 号：O43[机械工程—光学工程]