Abstract
A concept of an efficient ultra-thin spatial phase modulator for correcting terahertz wavefronts in transmission with sub-wavelength spatial resolution is experimentally demonstrated. It exploits a combination of spatially addressable resonant planar metamaterials (so-called metasurfaces) and an optically thin (< 0.04 λ) low-voltage (< 20 V) liquid crystal cell. The device allows ‘imprinting’ 2D phase profile of any spatial complexity with a spatial resolution better than 0.23 λ, and can be readily fabricated using the well-established LC-device technology and high-resolution photolithography technique.
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