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Summary: Reflective meta-atoms based on vanadium dioxide (VO2) are designed to achieve wavefront reconfiguration in terahertz frequency. The meta-atoms provide full phase coverage and high polarization conversion efficiency when VO2 is in the metal state. However, when VO2 undergoes phase transition to the insulating state, the phase coverage and polarization conversion capability decrease significantly. Three metasurfaces, including anomalous reflector, met-alens, and vortex beam generator, demonstrate wavefront manipulation and polarization conversion abilities when VO2 is in the metal state. On the other hand, when VO2 is in the insulating state, the metasurfaces function as specular reflectors. Simulations verify the wavefront modulation and polarization control abilities of the proposed metasurfaces.
OPTICS AND LASER TECHNOLOGY
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Article
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Zian Li et al.
Summary: This study designed a polarization-insensitive and absorption-tunable ultra-broadband terahertz metamaterial absorber. By analyzing the distribution of electric field and surface current, the mechanism of perfect absorption was explained. After optimizing the structural parameters, an average absorptance of 95.1% in the frequency range of 1.33 to 2.43 THz was achieved.
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