论文标题
有限尺寸介导的激光等离激元结合状态的辐射耦合
Finite size mediated radiative coupling of lasing plasmonic bound state in continuum
论文作者
论文摘要
分析了连续体中激光等离子体结合态的辐射特性。在远场以及有限大小的等离子晶格的源平面上分析了激光信号的拓扑电荷。确定了实现BIC与辐射连续体耦合的物理机制。我们表明，虽然BIC在多极共振中起源于其远场辐射特性，但受到依赖性的偶极矩分布，由有限的等离子晶格中的对称性破裂引起的位置依赖性偶极矩分布。值得注意的是，这种偶极矩启用了与辐射连续体的耦合，维持了无限晶格BIC的基本拓扑特征。
Radiative properties of lasing plasmonic bound state in continuum are analyzed. The topological charge of the lasing signal is analyzed in the far field as well as in the source plane of the finite sized plasmonic lattice. The physical mechanism enabling the coupling of the BIC to radiation continuum is identified. We show that while the BICs have their origin in multipolar resonances, their far-field radiation properties are governed by the position dependent dipole moment distribution induced by the symmetry breaking in a finite plasmonic lattice. Remarkably, this dipole-moment enabled coupling to radiation continuum maintains the essential topological features of the infinite lattice BICs.
