Terahertz reconfigurable dielectric metasurface hybridized with vanadium dioxide for two-dimensional multichannel multiplexing

Abstract

The metasurface hybridized with vanadium dioxide (VO2) can be dynamically tuned, which has attracted enormous attention in recent years and orbital angular momentum (OAM) multiplexing based on metasurfaces has shown promising prospects in terahertz communications. However, existing research on VO2 metasurface focuses on the metallic metasurface. The dielectric VO2 metasurface used for OAM multiplexing is rarely reported to the present. This paper proposed a terahertz reconfigurable dielectric metasurface hybridized with VO2 for two-dimensional multichannel multiplexing combing with spatial and frequency domains. The metasurface works in both reflection and transmission modes and simultaneously the polarization control and operating frequency band regulation can be realized by switching the VO2 from the metallic state to the insulator state. For the reflective or transmissive metasurface, when 4×M-channel (M is a positive integer) off-axis plane waves are incident on the metasurface, the co-polarization reflected or cross-polarization transmitted waves are transformed into 4×M-channel orthogonal on-axis beams with topological or frequency orthogonality. A metasurface composed of 14 × 14 unit cells is designed for verification. The simulated result shows that two-dimensional 12-channel multiplexing combing with OAM and frequency by the designed metasurface can be realized on the reflection and transmission modes in two different frequency bands. The proposed metasurface has great potential in terahertz communications.

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

“…As high-density communication evolves, the limitations of mono-functional coding devices have become apparent, failing to meet the sophisticated demands of integrated systems. Multifunctional coding metasurfaces have thus garnered substantial interest for their potential in integrated communication systems, attracting attention from both scientific and engineering fields [44,45]. Employing single-dimensional multiplexing techniques such as phase, angle, wavelength, and polarization, these devices are designed to manipulate electromagnetic waves across both half-space [46] and full-space scenarios [47].…”

A Terahertz Programmable Digital Metasurface Based on Vanadium Dioxide

“…The excellent phase transition characteristics of VO 2 make it suitable for designing active coding metasurfaces. In recent years, various digital coding metasurfaces based on VO 2 have been widely considered, which can realize the functions of orbital angular momentum (OAM) manipulation [13][14][15], beam scanning [16,17], holographic imaging [18], and so on. An active metasurface based on VO 2 was proposed to manipulate the generated OAM beams [19], which works in the Ku band, controlling the linearly polarized waves.…”