光子晶体中的光学龙卷风
Optical tornadoes in photonic crystals
摘要：
基于自旋电子学的光学类比，从理论上研究了不具有空间反演对称性的二维光子晶体中光学龙卷风的产生。我们解决它的密切关系，在晶体动量空间的Berry曲率，这代表了非平凡的几何性质的布洛赫状态。结果表明，通过调节蜂窝状光子晶体中的两种介质棒，可以很容易地控制Berry曲率。然后，具有大Berry曲率的Bloch态在实空间中表现为光学龙卷风。分析了这种构型的辐射力，并讨论了其可能的应用。
英文摘要：
Based on an optical analogy of spintronics, the generation of optical tornadoes is theoretically investigated in two-dimensional photonic crystals without space-inversion symmetry. We address its close relation to the Berry curvature in crystal momentum space, which represents the non-trivial geometric property of a Bloch state. It is shown that the Berry curvature is easily controlled by tuning two types of dielectric rods in a honeycomb photonic crystal. Then, Bloch states with large Berry curvatures appear as optical tornadoes in real space. The radiation force of such a configuration is analyzed, and its possible application is also discussed.
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