Kurosawa Hiroyuki, Choi Bongseok, Iwanaga Masanobu
National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, 305-0044, Japan.
National Institute of Information and Communications Technology (NICT), 588-2 Iwaoka, Kobe, 651-2492, Japan.
Nanoscale Res Lett. 2018 Jul 31;13(1):225. doi: 10.1186/s11671-018-2627-x.
This study focuses on the experimental and numerical investigations for the degradation characteristics of a metasurface polarizer. The metasurface has a stacked complementary structure that exhibits a high extinction ratio of the order of 10,000 in the near-infrared region. However, its performance has significantly degraded over time. To clarify the origin of this degradation, the effects of surface roughness and metallic loss are investigated numerically. The degradation is mainly attributed to increase in the loss. These numerical calculations also reveal that the extinction ratio is enhanced by adjusting the thicknesses of the complementary structures to different values. This study paves a way to realize a metasurface polarizer that has a low sensitivity to the time degradation and has a high extinction ratio.
本研究聚焦于对超表面偏振器退化特性的实验和数值研究。该超表面具有堆叠互补结构,在近红外区域呈现出高达10000量级的高消光比。然而,其性能随时间显著退化。为阐明这种退化的根源,对表面粗糙度和金属损耗的影响进行了数值研究。退化主要归因于损耗的增加。这些数值计算还表明,通过将互补结构的厚度调整为不同值,消光比会得到提高。本研究为实现对时间退化低敏感度且具有高消光比的超表面偏振器铺平了道路。