Terahertz tunable vanadium dioxide metasurface for dynamic illusion and cloaking

Area of Science:

• Metamaterials and Nanophotonics
• Terahertz Technology
• Electromagnetic Cloaking

Background:

• Metasurface-based illusion and cloaking devices often have limitations in frequency, angle, or polarization.
• Existing devices typically offer only a single function (either illusion or cloaking).

Purpose of the Study:

• To propose and demonstrate a tunable terahertz metasurface carpet cloak for dynamic illusion and cloaking.
• To overcome the limitations of single-function and fixed-parameter cloaking devices.

Main Methods:

• Utilized a terahertz tunable metasurface composed of vanadium dioxide (VO2).
• Employed electromagnetic simulations to analyze the cloak's performance.
• Controlled the state of VO2 to switch between cloaking and illusion functionalities.

Main Results:

• The metasurface carpet cloak simultaneously achieved illusion and cloaking functions at 0.45 THz and 0.6 THz.
• Demonstrated effectiveness for orthogonal circularly polarized waves across different incidence angles.
• Confirmed dynamic adjustability of function, frequency, incident angle, and polarization.

Conclusions:

• The proposed VO2 metasurface carpet cloak offers dynamically tunable illusion and cloaking capabilities.
• The device exhibits robustness to incident angle and stability for polarization angles.
• This work holds significant potential for practical applications in advanced optical devices.