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. Author manuscript; available in PMC: 2012 Dec 20.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2011 Dec 20;115(50):24437–24453. doi: 10.1021/jp207821t

Figure 12.

Figure 12

Collective response engineering: the role of long-range coupling in NCAs. (A) Simulated frequency spectra of the electric field intensity enhancement (over the free space value) averaged over isolated nanoparticle cluster geometries shown in the inset (blue) and clusters arranged into random 4 × 4 NCA configurations (red). The clusters are composed of 80nm-diameter Au nanospheres with 1 nm inter-particle separation immersed in the ambient medium with nr = 1.44, and are illuminated by a plane wave incident normally to the cluster plane. The intensity values are averaged over various angles of the in-plane light polarization (blue and red) and over different clusters within NCAs (red). Intensity enhancement for a single 80 nm Au nanoparticle is shown for comparison (navy). (B) & (C) Near-field intensity distributions in a typical NCA configuration at two wavelengths: (B) 785 nm and (C) 876.5 nm. Adapted with permission from ref69. Copyright 2011 American Chemical Society.