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. 2015 Dec 14;6:10103. doi: 10.1038/ncomms10103

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(a) Experimental measurements of optical behaviours of a black gold membrane peeled off with aluminium tape. Total reflection and absorption in the wavelength range of 400–2,500 nm. The inset represents reflection and absorption measured by Fourier transform infrared spectroscopy from 2.5 to 17 μm. (b) Optical properties of black gold membrane peeled off with 3M Micropore tape. Dotted, dashed and solid lines represent one layer, two layers and three layers, respectively. As the number of layers increases, the transmission decreases while the reflection is almost the same, resulting in the increase of absorption. (c,d) Theoretical FDTD calculations with structure modelling. Simulated absorption spectra using (c) funnel-shaped bundle structure model and (d) a merged Star of David nanowire hexagonal unit. The insets of c are the electric field profiles in x–z plane for a funnel-shaped bundle at (left) λ=600 nm and (right) 1,000 nm.