Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Influence of Gold Metallodielectric Partial-Shell Geometrical Irregularities on Dark Plasmon Resonances

Influence of Gold Metallodielectric Partial-Shell Geometrical Irregularities on Dark Plasmon Resonances
Shuang Fang Lim, Hans Hallen, Janina Wirth
The geometric asymmetry of real, fabricated gold partial shells leads to orientation and gold partial coverage dependent local fields and scattering. We illustrate this with single-particle measurements and finite element calculations. In particular, we show that the position and number of well-defined protrusions on the edge of a partial shell qualitatively change the spectra. The metallic protrusions result in geometrical asymmetry, which leads to excitation of the optically dark quadrupole mode as a function of incident light excitation and polarization. The far-field scattering peaks result from the bright dipole resonance with contribution from the dark resonance in the presence of the partial-shell surface protrusions. With more dark modes, the overall scattered intensity decreases, reflecting the energy trapped in the local electric fields of the dark modes, until it ultimately dissipates in the metal.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b05060

DOI: 10.1021/acs.jpcc.7b05060

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