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Ultrafast reprogrammable multifunctional vanadium-dioxide-assisted metasurface for dynamic THz wavefront engineering.

Javad Shabanpour1, Sina Beyraghi2, Ahmad Cheldavi2

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This study introduces a novel ultrafast, reprogrammable metasurface using vanadium dioxide (VO2) for dynamic terahertz wavefront control. This technology enables rapid switching between multiple functions, crucial for advanced wireless communications.

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Area of Science:

  • Photonics and Metamaterials
  • Terahertz Technology
  • Materials Science

Background:

  • Dynamic wavefront engineering is essential for advanced terahertz applications.
  • Existing metasurfaces often lack ultrafast switching speeds and multi-mission capabilities.
  • Vanadium dioxide (VO2) offers fast, reversible phase transitions suitable for dynamic control.

Purpose of the Study:

  • To propose and demonstrate a new generation of ultrafast, reprogrammable, multi-mission bias-encoded metasurface.
  • To achieve dynamic terahertz wavefront engineering using VO2 phase transitions.
  • To enable high-speed switching between diverse optical functions.

Main Methods:

  • Design of a novel meta-atom with three patterned VO2 thin films.
  • Utilizing the reversible monoclinic to tetragonal phase transition of VO2.
  • Employing a Field-programmable gate array (FPGA) platform for voltage-controlled biasing.
  • Applying spiral-like and spiral-parabola-like coding sequences.
  • Leveraging superposition theorem and convolution operations.

Main Results:

  • Demonstration of a multi-functional VO2-based coding metasurface (VBCM).
  • Dynamic tuning of meta-atom states between four configurations ('00'-'11') via biasing voltage.
  • Successful generation of single and focused vortex beams with switchable orbital angular momentum modes.
  • Realization of symmetric/asymmetric multiple beams and arbitrarily-oriented multiple vortex beams with controlled topological charges.

Conclusions:

  • The proposed VBCM offers ultrafast, reprogrammable control over terahertz wavefronts.
  • This technology is a promising solution for challenges in high data rate wireless communication requiring rapid mission switching.
  • The demonstrated multi-functionality and dynamic control pave the way for next-generation terahertz systems.