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. Author manuscript; available in PMC: 2018 Jun 11.
Published in final edited form as: Nat Nanotechnol. 2017 Dec 11;13(2):159–164. doi: 10.1038/s41565-017-0017-7

Figure 1. Structural and optical properties of plasmonic nanorod metamaterials.

Figure 1

a, Schematic diagram of the nanorod metamaterial, where d and l represent the diameter and length of the nanorods, respectively, and s is the separation between the nanorods. b, Cross-sectional view of a metamaterial showing Au nanorods embedded in a porous Al2O3 template. c, Surface morphology of an ion-milled metamaterial analysed by atomic force microscopy. The dips are the tips of Au nanorods surrounded by Al2O3. d, Experimental dispersion of extinction (for the angles below total internal reflection) and reflection (for the angles above total internal reflection) of the metamaterial for TM-polarized illumination.