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We investigate a scatterer comprising a dielectric core and randomly distributed metallic nanoparticles forming a shell. We show that it acts as an isotropic magnetic meta-atom and as a cloak to conceal the core.
The intense plasmon absorption bands of gold nanorods (GNRs) with peak extinction coefficients up to 6.4×109 M−1 cm−1 as well as their expected high stability make GNRs promising candidates for the colouration of bulk materials. The comparison of the integrated absorption in the visible region of GNRs with those of commercial organic pigments shows that the colouring strength of GNRs is 4 to 8 times...
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