太赫兹辐射
材料科学
超材料
光电子学
硫系化合物
光学
非凡的光传输
超短脉冲
等离子体子
激光器
表面等离子体子
表面等离子体激元
物理
作者
Tun Cao,NULL AUTHOR_ID,Meng Lian,Xieyu Chen,Libang Mao,Kuan Liu,Jingyuan Jia,Y. K. Su,Huihui Ren,Shoujun Zhang,Yifan Xu,Jiajia Chen,Zhen Tian,Dongming Guo,NULL AUTHOR_ID,NULL AUTHOR_ID
出处
期刊:Opto-electronic science
[Opto-Electronic Advances]
日期:2021-01-01
卷期号:1 (1): 210010-210010
被引量:32
标识
DOI:10.29026/oes.2022.210010
摘要
Metamaterials composed of metallic antennae arrays are used as they possess extraordinary optical transmission (EOT) in the terahertz (THz) region, whereby a giant forward light propagation can be created using constructive interference of tunneling surface plasmonic waves. However, numerous applications of THz meta-devices demand an active manipulation of the THz beam in free space. Although some studies have been carried out to control the EOT for the THz region, few of these are based upon electrical modulation of the EOT phenomenon, and novel strategies are required for actively and dynamically reconfigurable EOT meta-devices. In this work, we experimentally present that the EOT resonance can be coupled to optically reconfigurable chalcogenide metamaterials which offers a reversible all-optical control of the THz light. A modulation efficiency of 88% in transmission at 0.85 THz is experimentally observed using the EOT metamaterials, which is composed of a gold (Au) circular aperture array sitting on a non-volatile chalcogenide phase change material (Ge2Sb2Te5) film. This comes up with a robust and ultrafast reconfigurable EOT over 20 times of switching, excited by a nanosecond pulsed laser. The measured data have a good agreement with finite-element-method numerical simulation. This work promises THz modulators with significant on/off ratios and fast speeds.
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