轨道光学手性作为涡旋二色性的起源

中文摘要 AI 辅助

光学手性量化了电磁场的几何扭曲，并构成手性光-物质相互作用的基础，然而其传统表述仅捕捉了与自旋相关的光的手性几何。我们引入了轨道光学手性并推导了其连续性方程，揭示了与角动量不同的物理性质。对于涡旋光束，自旋和轨道光学手性分别遵循自旋和轨道指数。应用于扭曲的纳米棒二聚体时，轨道光学手性通过四极杂化模式产生涡旋二色性，而偶极模式仅表现出圆二色性。这些结果建立了光学手性的统一框架，并提供了超越仅由自旋光学手性分辨的手性几何的访问途径。

英文摘要

Optical chirality quantifies the geometrical twisting of electromagnetic fields and underlies chiral light-matter interactions, yet its conventional formulation captures only the spin-associated chiral geometry of light. We introduce orbital optical chirality and derive its continuity equation, revealing physical properties distinct from those of angular momentum. For vortex beams, spin and orbital optical chiralities follow the spin and orbital indices, respectively. Applied to a twisted nanorod dimer, orbital optical chirality gives rise to vortex dichroism through quadrupolar hybridized modes, while dipolar modes exhibit only circular dichroism. These results establish a unified framework for optical chirality and provide access to chiral geometries beyond those resolved by spin optical chirality alone.

发表机构

• Research Institute for Electronic Science, Hokkaido University（北海道大学电子科学研究所）

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