扭曲光子双层结构中光的涌现自旋与轨道角动量
Emergent spin and orbital angular momentum of light in twisted photonic bilayer
AI总结：
本研究发现扭曲光子双层结构可使零角动量非偏振光分别在透射、反射中获得自旋与轨道角动量，揭示其不同微观机制及与层间距的依赖关系，为角动量分辨光-物质相互作用提供新方向。
摘要：
我们证明，作为范德瓦尔斯结构光子对应物的扭曲光子双层结构的光学响应对光的自旋角动量（SAM）和轨道角动量（OAM）均敏感。一束角动量为零的非偏振光在透射时获得SAM，在反射时获得OAM。所建立的解析理论与数值计算表明，SAM和OAM源自不同的微观机制，且对层间距的依赖关系存在差异。这些预测现象无需光吸收，由扭曲结构中必然存在的莫尔图案的光子螺旋度依赖光衍射，以及SAM-OAM转换过程导致。我们还发现莫尔衍射光束中存在强SAM和OAM。本研究揭示了扭曲光子系统中涌现SAM与OAM之间的深层联系，为角动量分辨的光-物质相互作用提供了新的可能性。
英文摘要：
We demonstrate that the optical response of twisted photonic bilayers, photonic counterparts of van der Waals structures, is sensitive to both spin angular momentum (SAM) and orbital angular momentum (OAM) of light. A beam of unpolarized light with zero angular momentum acquires SAM in transmission and OAM in reflection. The developed analytical theory and numerical calculations show that the SAM and OAM arise from distinct microscopic mechanisms and depend differently on the interlayer distance. The predicted phenomena do not require light absorption and are caused by the photon-helicity-dependent light diffraction by the moiré pattern, which inevitably occurs in the twisted structure, and the SAM-OAM conversion processes. We also reveal strong SAM and OAM in the moiré-diffracted beams. Our findings uncover a profound connection between the emergent SAM and OAM in twisted photonic systems offering new possibilities for angular-momentum-resolved light-matter interactions.
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