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Comparative study on the far-field spectra and near-field amplitudes for silver and gold nanocubes irradiated at 514, 633 and 785 nm as a function of the edge length

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Abstract

We describe a systematic investigation by the discrete dipole approximation on the optical properties of silver (Ag) and gold (Au) nanocubes as a function of the edge length in the 20–100 nm range. Our results showed that, as the nanocube size increased, the plasmon resonance modes shifted to higher wavelengths, the contribution from scattering to the extinction increased, and the quadrupole modes became more intense in the spectra. The electric field amplitudes at the surface of the nanocubes were calculated considering 514, 633 and 785 nm as the excitation wavelengths. While Ag nanocubes displayed the highest electric field amplitudes (|E|max) when excited at 514 nm, the Au nanocubes displayed higher |E|max values than Ag, for all sizes investigated, when the excitation wavelength was either 633 or 785 nm. The variations in |E|max as a function of size for both Ag and Au nanocubes could be explained based on the relative position of the surface plasmon resonance peak relative to the wavelength of the incoming electromagnetic wave. Our results show that not only size and composition, but also the excitation wavelength, can play an important role over the maximum near-field amplitudes values generated at the surface of the nanocubes.

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Authors and Affiliations

  1. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes, 748, 05508-000, São Paulo-SP, Brazil

    W. Hermoso, T. V. Alves, F. R. Ornellas & P. H. C. Camargo

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  1. W. Hermoso
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  2. T. V. Alves
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  3. F. R. Ornellas
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  4. P. H. C. Camargo
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Correspondence to P. H. C. Camargo.

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Hermoso, W., Alves, T.V., Ornellas, F.R. et al. Comparative study on the far-field spectra and near-field amplitudes for silver and gold nanocubes irradiated at 514, 633 and 785 nm as a function of the edge length. Eur. Phys. J. D 66, 135 (2012). https://doi.org/10.1140/epjd/e2012-30144-y

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