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Reconfigurable All-dielectric Metasurfaces based on Optical Phase change Materials: Design Approaches

机译:基于光学相变材料的可重构全介电超表面:设计方法

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Optical metasurface is a recently emerged paradigm for controlling light propagation, which enables implementation of ultra-compact optical devices with extended functionalities. Nowadays the main challenge in the field is to realize active metasurfaces with high quality, high efficiency, and large tuning range. Here we present a design approach for constructing a two-state reconfigurable metalens made of low-loss optical phase-change material (O-PCM). The metalens design is capable to produce diffraction limited focusing, large change in focal length (from 1.5 mm to 2mm), and decent focusing efficiency of about 20% in both states. The proposed design methodology is generic and can be easily extended towards constructing metasurfaces, which can switch between two or more arbitrary phase maps.
机译:光学超表面是用于控制光传播的最近出现的范例,其使得能够实现具有扩展功能的超紧凑光学器件。如今,该领域的主要挑战是实现高质量,高效率和大调整范围的有源超颖表面。在这里,我们提出了一种设计方法,用于构造由低损耗光学相变材料(O-PCM)制成的两态可重构金属元。 Metalens设计能够在两种状态下产生衍射受限的聚焦,焦距的较大变化(从1.5 mm到2mm),以及不错的聚焦效率,大约为20%。所提出的设计方法是通用的,可以轻松扩展到构造超表面,该超表面可以在两个或多个任意相位图之间切换。

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