Ultrafast, high modulation depth terahertz modulators based on carbon nanotube thin films
Ultrafast, high modulation depth terahertz modulators based on carbon nanotube thin films
复制标题
基于碳纳米管薄膜的超快、高调制深度太赫兹调制器
DOI：
10.1016/j.carbon.2020.11.008
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发表时间：
2021-03-01
期刊：
影响因子：
10.9
通讯作者：
Lloyd-Hughes, James
中科院分区：
文献类型：
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作者：
Burdanova, Maria G.;Katyba, Gleb M.;Lloyd-Hughes, James
太赫兹技术和通信系统的发展正在创造对能够快速调制太赫兹光束的设备的需求。在这里，我们报道了基于碳纳米管薄膜的光诱导透明的高性能、宽带太赫兹调制器的设计和特性。这种新型调制器不是在标准调制模式下工作，在标准调制模式下，光激励降低了透射率，而是表现出具有增强透射率的反向调制模式。在飞秒脉冲照射下，当调制速度为340 GHz时，获得了+80%的调制深度。在400 GHz~2.6 THz的频率范围内，研究了薄膜厚度对插入损耗、调制速度和调制深度的影响。良好的调制深度和高的调制速度显示了碳纳米管薄膜在超快太赫兹调制器中的巨大潜力。(C)2020爱思唯尔有限公司。保留所有权利。
The development of THz technology and communication systems is creating demand for devices that can modulate THz beams rapidly. Here we report the design and characterisation of high-performance, broadband THz modulators based on the photo-induced transparency of carbon nanotube films. Rather than operating in the standard modulation mode, where optical excitation lowers transmission, this new class of modulators exhibits an inverted modulation mode with an enhanced transmission. Under femtosecond pulsed illumination, modulation depths reaching +80% were obtained simultaneously with modulation speeds of 340 GHz. The influence of the film thickness on the insertion loss, modulation speed and modulation depth was explored over a frequency range from 400 GHz to 2.6 THz. The excellent modulation depth and high modulation speed demonstrated the significant potential of carbon nanotube thin films for ultrafast THz modulators. (C) 2020 Elsevier Ltd. All rights reserved.