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Thin films of phase change materials for light control of metamaterials in the optical and infrared spectral domain

机译：相变材料薄膜，用于在光谱和红外光谱范围内控制超材料的光

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摘要

Nanophotonic component can be tuned by means of a thin phase change material (PCM) film put in its vicinity; PCM changes phases upon heat stimuli and thus provides a phase or amplitude optical contrast at the nanoscale. Vanadium dioxide (VO_2) is a promising material which undergoes semiconductor-to-metal phase transition at about 68 ℃. In this work we combine its transition with a metamaterial made of golden nanodiscs, in the infrared spectral range. Metamaterial dimensions can be adjusted to provide the almost unitary absorption in the desired spectral range, which can be switched to zero absorption by changing the VO_2 phase. We further propose the optical switching of a large number of unitary cells by means of a near-infrared or visible laser. For given wavelength and power of the laser, we show how the spot-size can be adjusted to ensure that the whole VO_2 reaches the transition temperature. We further investigate the substrate influence. We believe that this approach can be generally used to design the metamaterial for a specific application, and find optimum experimental requirements for its switching.
机译：可以通过放置在其附近的相变材料（PCM）薄膜来调节纳米光子组件。 PCM在热刺激下改变相位，从而在纳米级提供相位或幅度的光学对比。二氧化钒（VO_2）是一种有前途的材料，它在约68℃时经历半导体到金属的相变。在这项工作中，我们将其过渡过程与在红外光谱范围内由金色纳米圆盘制成的超材料相结合。可以调整超材料的尺寸，以在所需的光谱范围内提供几乎单一的吸收，可以通过更改VO_2相将其切换为零吸收。我们进一步提出通过近红外或可见激光对大量单体电池进行光开关。对于给定的激光波长和功率，我们展示了如何调整光点大小以确保整个VO_2达到转变温度。我们将进一步研究底物的影响。我们认为，这种方法通常可用于设计用于特定应用的超材料，并为其切换找到最佳实验要求。

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