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. 2016 Jun 22;6:28448. doi: 10.1038/srep28448

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(a) Drawing of the unit cell in a GSP-based metasurface, consisting of a dielectric spacer sandwiched between an optically thick metal film and an array of metallic nanobricks with subwavelength periodicity. (b) Calculated reflection coefficient as a function of nanobrick widths for a gold-SiO₂-gold configuration with geometrical parameters t = t_s = 40 nm and Λ = 250 nm at a wavelength of 800 nm. Colour map shows the reflection coefficient amplitude for x-polarised normal incident light, while lines are contours of the reflection phase for both x- and y-polarisation.