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Unlocked evanescent waves in periodic structures

机译:周期性结构中的解锁e逝波

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摘要

We predict the existence of evanescent modes with unlocked phases in two-dimensional (2D) dielectric periodic structures. Contrary to what is known for one-dimensional structures, where evanescent fields lock to the host modulation, we show that in 2D systems a new class of evanescent modes exists with an unlocked real part of the wave vector. Hence, beams constructed from such unlocked evanescent waves can exhibit spatial effects. A significant focalization of a beam propagating within the band gap of a flat photonic crystal slab is also shown. The predicted phenomenon is expected to be generic for spatially modulated materials.
机译:我们预测在二维(2D)介电周期性结构中存在具有未锁相的渐逝模式。与已知的一维结构(fields逝场锁定到主机调制)相反,我们显示了在2D系统中,一类新的van逝模式存在,且波矢量的未锁定实部。因此,由这种未锁定的van逝波构成的光束会表现出空间效应。还显示了在平坦光子晶体平板的带隙内传播的光束的显着聚焦。预期的现象对于空间调制材料是通用的。

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