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首页> 外文期刊>Optics Letters >Controlling the phase delay of light transmitted through double-layer metallic subwavelength slit arrays
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Controlling the phase delay of light transmitted through double-layer metallic subwavelength slit arrays

机译:控制透过双层金属亚波长狭缝阵列的光的相位延迟

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摘要

We demonstrate that the phase of light transmitted through double-layer subwavelength metallic slit arrays can be controlled through lateral shift of the two layers. Our samples consist of two aluminum layers, each of which contains an array of subwavelength slits. The two layers are placed in sufficient proximity to allow coupling of the evanescent fields at resonance. By changing the lateral shift between the layers from zero to half the period, the phase of the transmitted electromagnetic field is increased by pi, while the transmitted intensity remains high. Such a controllable phase delay could open new capabilities for nanophotonic devices that cannot be achieved with single-layer structures.
机译:我们证明了通过双层亚波长金属狭缝阵列传输的光的相位可以通过两层的横向移动来控制。我们的样品由两个铝层组成,每个铝层包含一个亚波长缝隙阵列。将这两层放置在足够接近的位置,以使瞬逝场在共振时耦合。通过将层之间的横向位移从零改变为周期的一半,透射电磁场的相位将增加pi,而透射强度则保持较高。这种可控的相位延迟可为单层结构无法实现的纳米光子器件打开新的功能。

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