Plasmon Coupling in Clusters Composed of Two-Dimensionally Ordered Gold Nanocubes

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 5; no. 18; pp. 2111 - 2119
• Main Authors: Chen, Huanjun, Sun, Zhenhua, Ni, Weihai, Woo, Kat Choi, Lin, Hai-Qing, Sun, Lingdong, Yan, Chunhua, Wang, Jianfang
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 18.09.2009; WILEY‐VCH Verlag
• Subjects: Clusters; Dipoles; Gold; Gold - chemistry; Hot Temperature; Joining; Microscopy, Electron, Scanning; Microscopy, Electron, Transmission; Nanocomposites; nanocubes; Nanomaterials; Nanostructure; Nanostructures; plasmon coupling; Scattering; Surface Plasmon Resonance - methods; UV/vis spectroscopy
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.200900256

Gold nanocubes are assembled into clusters of varying numbers and ordering on indium tin oxide substrates. The plasmon coupling in the clusters is studied with both dark‐field imaging and finite‐difference time‐domain calculations. Generally, as a cluster becomes larger and more asymmetric, it exhibits more scattering peaks towards longer wavelengths. The coupling of the vertically oriented dipole in the nanocube with its image dipole in the substrate generates two scattering peaks. One is fixed in energy and the other red‐shifts with increasing cluster size. The coupling of horizontally oriented dipoles among different nanocubes produces multiple scattering peaks at lower energies. Their positions and intensities are highly dependent on the number and ordering of nanocubes in the cluster. Au nanocubes in the clusters are further welded together by thermal treatment. The scattering peaks of the thermally treated clusters generally become sharper. The lower‐energy scattering peaks arising from dipolar oscillations are red‐shifted. Gold nanocubes are assembled on substrates into clusters of varying numbers and ordering (see picture). Plasmon coupling among the gold nanocubes is investigated by dark‐field scattering and electrostatic calculations. Gold‐nanocube clusters exhibit various plasmon resonance modes, the energy and intensity of which depend on the number and ordering of nanocubes in the cluster.