Metasurface based Terahertz Surface Wave Devices

Quan Xu1, Xueqian Zhang1, Yuehong Xu1, Chunmei Ouyang1, Yanfeng Li1, Jiaguang Han1,2, and Weili Zhang3,*

1State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
2Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China
3School of Electrical and Computer Engineering Oklahoma State University, Stillwater, Oklahoma 74078, USA


Terahertz science and technology promise many cutting-edge applications. Terahertz surface waves that propagate at metal–dielectric interfaces deliver a potentially effective way to develop integrated terahertz devices and systems. Previous concerns regarding terahertz surface waves have been based on their highly delocalized feature. However, recent advances in plasmonics indicate that the confinement of terahertz surface waves, as well as their propagating behaviors, can be engineered by designing the surface environments, shapes, structures, materials, etc., enabling a unique and fascinating regime of plasmonic waves (see Fig. 1) [1]. In particular, the development of meta-optics has rapidly revolutionized the design concept of traditional optical devices, fostering metasurface-based innovative plasmonic devices [2]. Herein, we present our recent progress in metasurface-based terahertz surface wave devices, including gradient index devices [3], functional couplers[4], plasmonic vortex generators [5], and on-chip demultiplexers [6,7].

Figure 1: Simulation results of various terahertz surface waves using a commercial eigenmode solver [1].

[1] X. Zhang, et al., Terahertz surface plasmonic waves: a review, Advanced Photonics 2, 014001 (2020)
[2] Q. Xu, et al., Meta-optics inspired surface plasmon devices, Photonics Insights 2, R02 (2023)
[3] X. Su, et al., Gradient index devices for terahertz spoof surface plasmon polaritons, ACS Photonics 7, 3305-3312 (2020)
[4] J. Han, et al., Tailorable polarization-dependent directional coupling of surface plasmons, Advanced Functional Materials 32, 2111000 (2022)
[5] Y. Lang, et al., On-chip plasmonic vortex interferometers, Laser & Photonics Reviews 16, 2200242 (2022)
[6] X. Jiang, et al., Geometric phase control of surface plasmons by dipole sources, Laser & Photonics Reviews 17, 2200948 (2023)
[7] X. Jiang, et al., On-chip terahertz orbital angular momentum demultiplexer, Photonics Research 12, (2024)

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