基于超表面的太赫兹波片研究进展

Research Progress of Terahertz Waveplate Based on Metasurface

太赫兹(THz)技术在无损检测、通信、光谱分析和传感方面的独特应用使其受到了广泛关注,但传统THz波片的体积大、损耗高。超表面是由人工设计的亚波长周期超原子组成的二维平面材料,可以在亚波长厚度下灵活调控电磁波的振幅、相位和偏振,为设计超紧凑和高性能的THz波片提供了平台。综述了基于自然材料、介质光栅和超表面的THz偏振波片,重点介绍了基于超表面的THz波片,包括不同谐振结构、可开关和连续调谐的波片等,最后对这些THz波片的发展进行了总结和展望。

Terahertz(THz)technology is gaining lots of attention for its unique applications in nondestructive testing,communications,spectral analysis and sensing.However,the traditional THz waveplate has a large size and high loss.As a two-dimensional planar material composed of artificially designed subwavelength periodic meta-atoms,the metasurface can flexibly adjust the amplitude,phase and polarization of electromagnetic waves within the subwavelength thickness,providing a platform for the design of ultra-compact and high-performance THz waveplate.In this paper,the THz polarization waveplate based on natural materials,dielectric gratings and metasurface are reviewed respectively.In particular,the THz polarization waveplate based on metasurface is mainly focused,including different resonant structures,switchable and continuously tuned,etc.Finally,the development of these terahertz polarization waveplate is summarized.