Figure 5.

(a) The schematic diagram of metamaterial and graphene-based thermal emitter. (b) The top view metamaterial graphene-based thermal emitter for the direct comparison of the light-emitting surface patterned with four quadrants (with each 250 μm × 250 μm). The ring resonators consist of 5/50 nm thick Cr/Au, patterned on the encapsulated graphene surface, (c) the spatial measured thermal radiations from the fabricated device. (d) The experimental (red line) and simulated (blue line) emission spectra [104].