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Issue 19, 2018
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Radiation of the high-order plasmonic modes of large gold nanospheres excited by surface plasmon polaritons

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Abstract

Large metallic nanoparticles with sizes comparable to the wavelength of light are expected to support high-order plasmon modes exhibiting resonances in the visible to near infrared spectral range. However, the radiation behavior of high-order plasmon modes, including scattering spectra and radiation patterns, remains unexplored. Here, we report on the first observation and characterization of the high-order plasmon modes excited in large gold nanospheres by using the surface plasmon polaritons generated on the surface of a thin gold film. The polarization-dependent scattering spectra were measured by inserting a polarization analyzer in the collection channel and the physical origins of the scattering peaks observed in the scattering spectra were clearly identified. More interestingly, the radiation of electric quadrupoles and octupoles was resolved in both frequency and spatial domains. In addition, the angular dependences of the radiation intensity for all plasmon modes were extracted by fitting the polarization-dependent scattering spectra with multiple Lorentz line shapes. A significant enhancement of the electric field was found in the gap plasmon modes and it was employed to generate hot-electron intraband luminescence. Our findings pave the way for exploiting the high-order plasmon modes of large metallic nanoparticles in the manipulation of light radiation and light–matter interaction.

Graphical abstract: Radiation of the high-order plasmonic modes of large gold nanospheres excited by surface plasmon polaritons

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Publication details

The article was received on 13 Mar 2018, accepted on 10 Apr 2018 and first published on 11 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR02099J
Citation: Nanoscale, 2018,10, 9153-9163
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    Radiation of the high-order plasmonic modes of large gold nanospheres excited by surface plasmon polaritons

    J. Chen, J. Xiang, S. Jiang, Q. Dai, S. Tie and S. Lan, Nanoscale, 2018, 10, 9153
    DOI: 10.1039/C8NR02099J

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