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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 8.

Figure 8

NCA building blocks: the role of symmetry in the NP cluster response. (A1–D1) GMT-calculated polarization-averaged scattering efficiency and (A2–D2) polarization-sensitive near-field intensity enhancement (over the free space value) spectra of symmetrical trimer (A1,A2), tetramer (B1,B2), pentamer (C1,C2) and heptamer (D1,D2) NP clusters. 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 either normally to the cluster plane (A2–D2) or at 54° degrees to normal (A1–D1). (A3–D3) Typical electric field intensity distributions around each cluster calculated at the wavelength of the corresponding main peak in the cluster intensity spectrum.