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Beaming effect and directional emission from photonic-crystal waveguides

机译:光子晶体波导的光束效应和定向发射

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It is known that free-space focusing of light from sub-wavelength apertures, the so-called beaming effect of light,can be achieved through the excitation of radiative surface modes and their subsequent constructive interferencein space surrounding the apertures. This effect, studied extensively in metallic thin films, has recently beenshown to exist in photonic-crystal structures. In this paper, we present a comprehensive study of the beamingeffect and light directional emission achieved through simple geometric and material engineering of the surfaceand near-surface structures in two types of photonic-crystal waveguides, classified as increased- and decreasedindexstructures. We analyze different methods to enhance the directional emission and calculate the resultingefficiencies, highlighting the influence of reflections and matching conditions at the waveguide terminations.
机译:已知可以通过激发辐射表面模式及其随后在孔周围的空间中的相长干涉来实现来自亚波长孔的光的自由空间聚焦,即所谓的光的束效应。在金属薄膜中进行了广泛研究的这种效应最近已显示出存在于光子晶体结构中。在本文中,我们对通过两种类型的光子晶体波导中的表面和近表面结构的简单几何和材料工程实现的射束效应和光定向发射进行了全面研究,分为增加和减少折射率结构。我们分析了不同的方法来增强方向性发射并计算所得效率,重点介绍了波导终端处反射和匹配条件的影响。

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