AI 中文总结
本文研究谷极化表面晶格共振的赝角动量守恒，建立其与局域表面等离子体角动量的关联，提出匹配的结构化光场实现选择性耦合，为纳米光子控制等提供新机遇。
AI 中文摘要
表面晶格共振（SLRs）是纳米颗粒阵列中的集体极化激元激发，其带边态可实现基于对称性的辐射控制，包括散射、光致发光、传统及极化激元激光与玻色-爱因斯坦凝聚。本文表明，奇偶性破缺的蜂窝与 kagome 排列六边形阵列中，谷极化 SLRs 的整数赝角动量（PAM）直接编码于其发射电磁场的相位与偏振结构。研究了奇偶对称性破缺对 SLR PAM 及构成阵列的单个纳米颗粒相关的局域表面等离子体角动量的影响，并建立了这些量间的明确关联。利用电磁互易性，本文进一步提出一种结构化光场，其具有与底层 SLRs 相同的阵列对称性和整数 PAM，通过理论与数值证明，该光场可选择性耦合至具有匹配量化 PAM 的谷极化 SLRs。研究结果表明，涉及晶格共振的 PAM 分辨光-物质相互作用，为对称性选择性纳米光子控制、手性光产生及角动量调控超表面提供了新机遇。
英文摘要
Surface lattice resonances (SLRs) are collective polaritonic excitations in nanoparticle arrays, with band-edge states enabling symmetry-based control of radiation including scattering, photoluminescence, conventional and polariton lasing, and condensation. Here, we show that the integer pseudoangular momentum (PAM) of valley-polarized SLRs in parity-broken hexagonal arrays of honeycomb and kagome arrangements is directly encoded in the phase and polarization structure of their emitted electromagnetic fields. The effects of parity-symmetry breaking on SLR PAM and the localized surface plasmon angular momentum associated with the individual nanoparticles composing the array are investigated, and an explicit link between these quantities is established. Leveraging electromagnetic reciprocity, we further propose a structured optical field possessing the same array symmetries and integer PAM as the underlying SLRs and demonstrate theoretically and numerically that it selectively couples to valley-polarized SLRs with matching quantized PAM. Our results establish PAM-resolved light-matter interactions involving lattice resonances as providing new opportunities for symmetry-selective nanophotonic control, chiral light generation, and angular-momentum-engineered metasurfaces.
