Taming the Electromagnetic Boundaries via Metasurfaces: From Theory and Fabrication to Functional Devices

Figure 26

(a) A side view of the sensor. Palladium nanowires are stacked above a gold mirror. The layers are separated by a MgF2 film. (b) A sketch of the experimental setup including the mass flow controllers used to set the desired hydrogen concentrations. (c) Simulated response of the sensor structure to hydrogen exposure. (d) Reflectance of the absorber for different hydrogen concentrations. (e) SEM images of split ring resonators (SRRs) on a graphene layer. (f) Experimental results of the Raman spectra for different conditions. Figures are reproduced from (a)–(d) [149] and (e, f) [150].

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