Fig. 3

The various functions realized by information metamaterials. a A broadband THz coding metasurface for RCS reduction. (from Fig. 1 of Ref. [88]). Reproduced with permission from Ref. [88] under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. Copyright 2015, Springer Nature. b A light-controlled programmable metasurface. (from Fig. 1 of Ref. [89]). Reproduced with permission from Ref. [89] under the terms of the Creative Commons Attribution License. Copyright 2018, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. c and d The anisotropic coding metasurface in THz. (from Fig. 1 of Ref. [90]). Reproduced with permission from Ref. [90] under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. Copyright 2016, Springer Nature. e A nonreciprocity-programmable metasurface. (from Fig. 1 of Ref. [84]). Reproduced with permission from Ref. [84]. Copyright 2019, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. f A combination coding metasurface on orthogonal polarizations and OAM modes. (from Fig. 1 of Ref. [64]). Reproduced with permission from Ref. [64]. Copyright 2017, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim