基于硫属化物相变材料的可重构太赫兹超表面器件的研究进展

Progress on reconfigurable terahertz metasurface devices based on sulfide phase change materials

超表面在控制电磁波的强度、相位、偏振和复杂波前等方面发挥了重要的作用,通过与各种主动调控手段结合可实现动态可调谐器件。本文分析总结了近期基于Ge_(2)Sb_(2)Te_(5)(GST)的太赫兹超表面器件的研究进展,介绍了GST在太赫兹波段的光谱特性和可逆相变条件,重点回顾了GST与超表面设计相结合用于实现对太赫兹波的振幅、偏振以及波前的非易失、可重构、和多级操纵的前沿研究工作,并讨论展望了未来的发展前景和需要解决的问题。

Metasurfaces play an important role in controlling the amplitude,phase,polarization,and complex wavefront of electromagnetic waves.Dynamic tunable devices can be realized by combining various active modulation means.However,most of the existing reconfigurable devices have volatile properties that require a constant stimulus to maintain.The chalcogenide phase-change material Ge_(2)Sb_(2)Te_(5)(GST)has the characteristics of non-volatility,reconfigurability,and large optical contrast,which can be used to achieve tunable metasurface devices.In this review,we review the recent research progress of GST-based terahertz(THz)metasurface devices and introduce the spectral characteristics and reversible phase transition conditions of GST in the THz band.Furthermore,we systematically summarizes the relevant works on non-volatile,reconfigurable,and multi-level manipulation of THz amplitude,polarization,and wavefront by combining GST with metasurfaces.Finally,the future development prospects and challenges are discussed.The non-volatile nature of GST provides a new path to achieve non-volatile reconfigurable THz devices with low energy consumption,while its ultra-fast volatility can be used for next-generation high-speed communication.