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The schematic illustration of the bulk fishnet metamaterial. (a) Bulk fishnet metamaterial with four-layer metallic fishnet structure, the yellow area indicates the unit cell. (b) The unit symbols for the fishnet metamaterial with , , , , and . Note that the gap between adjacent metal layers is when the stackable unit is cascaded to a multilayer structure.
Transmission spectra of the ten-layer fishnet metamaterial with and without gain. The reference data are obtained with the same gain , but at an assumed emission wavelength for the active quantum dots. The inset shows the gain profile of PbS quantum dots.
Retrieved constitutive parameters of the proposed fishnet metamaterial.
Dependence of the left-handed transmission on propagation layers and gain coefficient.
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