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Buchnev, O.; Podoliak, N.; Kaltenecker, K.; Walther, M. and Fedotov, V. A. (2020): Metasurface-Based Optical Liquid Crystal Cell as an Ultrathin Spatial Phase Modulator for THz Applications. In: ACS Photonics, Vol. 7, No. 11: pp. 3199-3206

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

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