Zheludev's group combined carbon nanotubes (CNTs) with metamaterials to engage the resonant local fields in the vicinity of the metamaterial, leading to enhanced nonlinearity. This is a smart idea! Redshift of the plasmon absorption resonance was observed in the CNT-functionalized metamaterial.
More details can be found in this paper:
A. E. Nikolaenko et al. Carbon nanotubes in a photonic metamaterial. Phys. Rev. Lett. 104, 153902 (2010) [...]
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