Cavity modes with optical orbital angular momentum in a metamaterial ring based on transformation optics
Cavity modes with optical orbital angular momentum in a metamaterial ring based on transformation optics
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基于变换光学的超材料环中具有光学轨道角动量的腔模
DOI：
10.1364/oe.23.032087
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发表时间：
2015-12-14
期刊：
影响因子：
3.8
通讯作者：
Wang, Mu
中科院分区：
文献类型：
--
作者：
Wu, H. W.;Wang, F.;Wang, Mu
本文基于变换光学理论研究了超材料环中具有横向轨道角动量的腔模。超材料环通过增大方位角将光的直线轨迹转变为循环轨迹，有效地呈现出具有横向轨道角动量的模式。模拟结果证实了理论预测，即模式的横向轨道角动量不仅依赖于入射光的频率，而且依赖于方位角的变换尺度。由于能量耗散不可避免地降低了模式的场幅度，因此还研究了环内模式的受限电磁能量和品质因数，以评估这些腔模式的稳定性。结果表明，即使环的尺寸远小于入射光的波长，超材料环也能有效地限制光，并保持高品质因子的稳定模式和轨道角动量。这种利用具有光学横向轨道角动量的模式的技术可以为与微操作相关的应用提供独特的平台。2015美国光学学会Optical Society of America
In this work, we theoretically study the cavity modes with transverse orbital angular momentum in metamaterial ring based on transformation optics. The metamaterial ring is designed to transform the straight trajectory of light into the circulating one by enlarging the azimuthal angle, effectively presenting the modes with transverse orbital angular momentum. The simulation results confirm the theoretical predictions, which state that the transverse orbital angular momentum of the mode not only depends on the frequency of the incident light, but also depends on the transformation scale of the azimuthal angle. Because energy dissipation inevitably reduces the field amplitude of the modes, the confined electromagnetic energy and the quality factor of the modes inside the ring are also studied in order to evaluate the stability of those cavity modes. The results show that the metamaterial ring can effectively confine light with a high quality factor and maintain steady modes with the orbital angular momentum, even if the dimension of the ring is much smaller than the wavelength of the incident light. This technique for exploiting the modes with optical transverse orbital angular momentum may provides a unique platform for applications related to micromanipulation. (C)2015 Optical Society of America