Switchable multifunctional terahertz metamaterial with slow-light and absorption functions based on phase change materials
Authors:
- 1 January 2023
- journal article
- research article
- Published by Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences in Acta Physica Sinica
- Vol. 72 (8) , 084202
Abstract
本文基于相变材料Ge2Sb2Te5（GST）设计了一种太赫兹超材料，在太赫兹波段实现了慢光和吸收功能的切换。该超材料由三部分构成，分别是金环构成的微结构层、二氧化硅介质层和GST薄膜。研究结果表明：当GST薄膜处于绝缘态时，由于两个谐振环的电磁诱导透明效应，入射THz光脉冲通过该THz超材料时群速度会减慢，最大群延迟可以达到3.6 ps；当GST薄膜转变为金属态时，THz超材料可实现双波段吸收，在0.365 THz处吸收率可以达到97%，在0.609 THz处吸收率可以实现完美吸收（吸收率100%）。另外，我们还研究了该THz超材料的入射光偏振不敏感特性，发现当入射光脉冲的偏振角从0°变化到90°时，THz超材料的慢光和吸收特性不受影响。所设计的THz超材料在光缓存器、光传感器、光开关等领域具有潜在的应用价值。Keywords
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