Multifunctional and dynamically tunable terahertz metamaterials based on TiNi shape memory alloy films with a simple design
Multifunctional and dynamically tunable terahertz metamaterials based on TiNi shape memory alloy films with a simple design
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基于TiNi形状记忆合金薄膜的多功能、动态可调太赫兹超材料，设计简单
DOI：
10.1016/j.rinp.2021.104165
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发表时间：
2021
影响因子：
5.3
通讯作者：
Kun Zhang
中科院分区：
文献类型：
--
作者：
Changlong Tan;Juan Liu;Xiaohua Tian;Jiachen Zhu;Kun Zhang
在太赫兹（THz）领域，制约其发展和应用的一个关键问题是缺乏动态和多功能的材料。在这项工作中，创新地将镍钛薄膜引入设计中，并提出了多功能和动态可调谐的太赫兹超材料。系统地研究和揭示了马氏体相变前后材料的形状变形和电导率变化对电磁响应的影响及其机理。基于新型镍钛超材料，将电感-电容共振和偶极子共振同时用于太赫兹滤波器，得到了性能优异的双带滤波器。通过驱动马氏体相变，LC和偶极共振的频率都可以动态调谐到所需的工作频率。带阻滤波器的谐振频率可达到0.56 THz的动态调制范围。此外，研究结果还表明，当马氏体相变发生时，在0.47太赫兹处，太赫兹波透射率可以从0.78调谐到0.04。此外，作为一种优秀的开关，开状态的透过率比关状态的透过率高一个数量级。总之，本研究为开发可调谐双频太赫兹滤波器和热致太赫兹开关提供了新的视角和思路。
In the terahertz (THz) fields, a crucial point of restricting its development and application is the lack of dynamic and multifunctional materials. In this work, NiTi films are innovatively introduced into the design, and multifunctional and dynamically tunable terahertz metamaterials are proposed. The influence and mechanism of the shape deformation and conductivity changes before and after martensitic transformation on the electromagnetic response are systematically investigated and revealed. Based on the novel NiTi metamaterials, inductance-capacitance (LC) resonance and dipole resonance are used simultaneously for the terahertz filter, and an excellent dual-band filter is obtained. The frequencies of both LC and dipolar resonances can be dynamically tuned to the desired operating frequencies by driving the martensitic transformation. And the resonant frequency of the band-stop filter achieves a dynamic modulation range up to 0.56 THz. Furthermore, the results also show that when martensitic transformation occurs, the terahertz wave transmission can be tuned from 0.78 to 0.04 at 0.47 THz. Moreover, as an excellent switch, the ON state transmittance is one order of magnitude higher than the OFF-state transmittance. In brief, this study provides a new perspective and ideas for developing a tunable dual-band terahertz filter and thermal-induced terahertz switch.