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<https://discovery.ucl.ac.uk/id/eprint/10043652> <http://purl.org/ontology/bibo/abstract> "Graphene gratings provide a promising route towards the miniaturization of THz\r\nmetasurfaces and other photonic devices, chiefly due to remarkable optical properties of graphene.\r\nIn this paper, we propose novel graphene nanostructures for passive and active control of the\r\npolarization state of THz waves. The proposed devices are composed of two crossed graphene\r\ngratings separated by an insulator spacer. Because of specific linear and nonlinear properties of\r\ngraphene, these optical metasurfaces can be utilized as ultrathin polarization converters operating\r\nin the THz frequency domain. In particular, our study shows that properly designed graphene\r\npolarizers can effectively select specific polarization states, their thickness being about a tenth of\r\nthe operating wavelength and size more than 80× smaller than that of similar metallic devices.\r\nEqually important, we demonstrate that the nonlinear optical properties of graphene can be\r\nutilized to actively control the polarization state of generated higher harmonics."^^<http://www.w3.org/2001/XMLSchema#string> .
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