通过破对称超表面中的相干多极散射实现光-物质相互作用的动态控制
Dynamical control of light-matter interaction through coherent multipolar scattering in broken symmetry metasurfaces
浏览论文内容
中文总结 AI 辅助
该研究通过相位分辨多极分析，利用破对称硅介质超表面实现磁偶极子与磁四极子模式杂化，借助相干磁多极干涉增强铒离子自发辐射，为集成量子光子器件提供设计准则。
中文摘要 AI 辅助
通过调控光-物质相互作用实现对自发辐射的控制是量子纳米光子学的核心目标之一。由硅（Si）等高折射率谐振器构成的超表面是一种低损耗平台，支持多种强电、磁多极共振，为调控光学态密度（LDOS）提供了新机遇。本研究采用相位分辨多极分析，探究由硅长方体和圆盘谐振器构成的破对称介质超表面中的自发辐射控制。可控的面内几何不对称性可实现磁偶极子（MD）与磁四极子（MQ）模式的杂化，其相干相互作用会改变光学态密度（LDOS）。破对称介质超表面与连续谱中的准束缚态（quasi-BICs）及Fano共振系统密切相关，几何微扰会促进弱辐射模式与亮模式的耦合，从该角度看，观测到的MD-MQ杂化态可理解为破对称准BIC物理的近场与多极表现。这种相干磁多极相互作用会产生强近场局域，并为嵌入的发射器带来显著的自发辐射增强。对于工作在1.54μm附近的破对称硅超表面中的铒离子，分析显示其存在与共振磁多极耦合相关的显著增强。这些结果确立了磁多极干涉是低损耗介质超表面中实现辐射控制的物理透明机制，并为集成量子光子器件提供了实用设计准则。
英文摘要
Achieving control over spontaneous emission by tailoring light-matter interactions is a key objective in quantum nanophotonics. Metasurfaces composed of high-refractive-index resonators like silicon (Si) provide a low-loss platform that supports a variety of strong electric and magnetic multipolar resonances, offering new opportunities to tailor the local density of optical states (LDOS). This work employs phase-resolved multipolar analysis to investigate spontaneous-emission control in symmetry-broken dielectric metasurfaces composed of Si cuboid and disk resonators. Controlled in-plane geometrical asymmetry enables hybridization between magnetic dipole (MD) and magnetic quadrupole (MQ) modes, whose coherent interaction modifies the local density of optical states (LDOS). Symmetry-broken dielectric metasurfaces are closely related to quasi-bound states in the continuum (quasi-BICs) and Fano-resonant systems, where geometrical perturbations promote coupling between weakly radiative and bright resonances. From this perspective, the observed MD-MQ hybridized states may be understood as a near-field and multipolar manifestation of symmetry-broken quasi-BIC physics. The resulting coherent magnetic multipolar interaction produces strong near-field localization and substantial spontaneous-emission enhancement for embedded emitters. For Erbium ions in broken-symmetry Si metasurfaces operating near 1.54 um, the analysis reveals pronounced enhancement associated with resonant magnetic multipolar coupling. These results establish magnetic multipolar interference as a physically transparent mechanism for emission control in low-loss dielectric metasurfaces and provide useful design guidelines for integrated quantum photonic devices.
