太赫兹表面等离激元的研发与应用

表面等离激元的研究推动了超分辨成像、高灵敏传感、片上集成系统等应用的发展。将其应用在太赫兹这一高穿透性、高带宽波段时必然会带来更多迷人的功能。由于太赫兹波段频率较低，表面等离激元具有许多不同于可见光的现象。通过控制金属表面微纳结构或半导体材料与太赫兹波之间的相互作用，人们实现了对太赫兹波表面波的控制。本文综述了太赫兹波段表面等离激元的基本原理和研究历程，介绍了近年来在此波段开展的热门研究成果，如波前整型、片上波导、可调谐器件等，最后总结了这一领域的发展瓶颈并展望了未来主要发展方向，希望能够进一步推动太赫兹波段表面等离激元应用的发展。

Design and applications of terahertz surface plasmon polaritons

Surface Plasmon Polaritons(SPPs) has promoted the development of applications such as strong radiation sources, super-resolution imaging, sensitive sensing, and on-chip integration. It will inevitably bring more fascinating functions when it is applied to the terahertz(THz) band which has advantages of strong-penetration, high-bandwidth, and so on. Due to the low frequency of THz radiation, many distinctive phenomena of SPPs have occurred in this range. By controlling the interaction between the subwavelength metal structures or semiconductor materials with the THz radiation, the approach for modulating SPPs in such low-frequency domain has been realized. In this paper, the basic principles and research history of SPPs in the THz range are reviewed, then the hot topics carried out in recent years are introduced, such as electric field modulation, on-chip waveguides, and tunable devices. At last,the bottleneck problems are summaried and the future trends are expected.