Terahertz programmable metasurface based on solid-state plasma

Terahertz modulation technology based on programmable metasurfaces can respond in real time to external signals or environmental changes, enabling flexible and adaptive control of terahertz waves. This technology demonstrates significant potential and importance across various fields, including communication, imaging, scientific research, security monitoring, and industrial applications. This paper proposes a terahertz programmable metasurface based on solid-state plasma, utilizing solid-state plasma devices to achieve dynamic control of properties such as the amplitude and phase of terahertz waves. Compared to traditional silicon-based devices, GaAs/AlGaAs heterostructures enhance both the forward current and solid-state plasma concentration of the metasurface devices by two orders of magnitude, with carrier concentrations exceeding 10¹⁹cm^-3. Additionally, we designed a solid-state plasma metasurface containing 12×12 supercells, achieving dynamic modulation of terahertz waves in the elevation direction through different coding schemes. Furthermore, this paper explores the stealth control mechanism of solid-state plasma metasurfaces, achieving effective cloaking of detection targets through specific phase compensation.