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Dynamic Photoinduced Controlling of the Large Phase Shift of Terahertz Waves via Vanadium Dioxide Coupling Nanostructures
ACS Photonics ( IF 6.5 ) Pub Date : 2018-07-12 00:00:00 , DOI: 10.1021/acsphotonics.8b00276
Yuncheng Zhao 1 , Yaxin Zhang 1 , Qiwu Shi 2 , Shixiong Liang 3 , Wanxia Huang 2 , Wei Kou 1 , Ziqiang Yang 1
Affiliation  

Utilizing terahertz (THz) waves to transmit data for communication and imaging places high demands on phase modulation. However, until now, it is difficult to realize a more than 100° phase shift in the transmission mode with one-layer structure. In this paper, a ring-dumbbell composite resonator nested with VO2 nanostructures is proposed to achieve the large phase shift. It is found that in this structure a hybrid mode with an enhanced resonant intensity, which is coupled by the L-C resonance and dipole resonance has been observed. Applying the photoinduced phase transition characteristics of VO2, the resonant intensity of the mode can be dynamically controlled, which leads to a large phase shift in the incident THz wave. The dynamic experimental results show that controlling the power of the external laser can achieve a phase shift of up to 138° near 0.6 THz using this one-layer VO2 nested composite structure. Moreover, within a 55 GHz (575–630 GHz) bandwidth, the phase shift exceeds 130°. This attractive phase shift modulation may provide prospective applications in THz imaging, communications, and so on.

中文翻译:

通过二氧化钒偶联纳米结构动态光诱导太赫兹波的大相移控制

利用太赫兹(THz)波传输数据进行通信和成像对相位调制提出了很高的要求。然而,直到现在,在具有一层结构的传输模式中都难以实现大于100°的相移。本文提出了一种嵌套有VO 2纳米结构的环形哑铃复合谐振器,以实现大的相移。发现在这种结构中,已经观察到具有增强的共振强度的混合模式,其通过LC共振和偶极共振耦合。VO 2的光致相变特性的应用,该模式的谐振强度可以动态控制,从而导致入射太赫兹波的大相移。动态实验结果表明,使用这种单层VO 2嵌套复合结构,控制外部激光器的功率可以在0.6 THz附近实现高达138°的相移。此外,在55 GHz(575–630 GHz)带宽内,相移超过130°。这种有吸引力的相移调制可以在THz成像,通信等方面提供预期的应用。
更新日期:2018-07-12
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