由曲线元表面成形的光胶囊
Light capsules shaped by curvilinear meta-surfaces
摘要：
本文提出了一种简单有效的方法，利用近似完整的圆形光壳产生面内空心光束，而不需要后向传播波的贡献。该方法依赖于调制中心对称光学波前的近场相位，例如来自高数值孔径聚焦波场的相位。我们说明了如何通过使用由工程等离子体纳米缝形成的超窄非平坦元表面来进行光束加速。数值模拟了一个关于光轴镜像对称的圆焦散面，它可以用作光学瓶。
英文摘要：
We propose a simple yet efficient method for generating in-plane hollow beams with a nearly-full circular light shell without the contribution of backward propagating waves. The method relies on modulating the phase in the near field of a centro-symmetric optical wavefront, such as that from a high-numericalaperture focused wave field. We illustrate how beam acceleration may be carried out by using an ultranarrow non-flat meta-surface formed by engineered plasmonic nanoslits. A mirrorsymmetric, with respect to the optical axis, circular caustic surface is numerically demonstrated that can be used as an optical bottle.
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