Designing spinning Bloch states in 2D photonic crystals for stirring nanoparticles.
Designing spinning Bloch states in 2D photonic crystals for stirring nanoparticles.
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DOI：
10.1103/physrevlett.103.033903
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发表时间：
2009-07
影响因子：
8.6
通讯作者：
M. Onoda;T. Ochiai
中科院分区：
文献类型：
--
作者：
M. Onoda;T. Ochiai
基于自旋电子学的光学类比，从理论上研究了无空间反转对称性的二维光子晶体中自旋布洛赫态的产生。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。在真实的空间中，具有大Berry曲率的布洛赫态表现为光学龙卷风。分析了这种结构的辐射力，并讨论了它在选择性光搅拌器中的可能应用，作为光镊技术的补充方案。
Based on an optical analogy of spintronics, the generation of spinning Bloch states 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 nontrivial 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. 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 for selective optical stirrer is discussed as a complementary proposal in optical tweezers technology.