Mie and Bragg Plasmons in Subwavelength Silver Semi‐Shells
- 4 December 2008
- Vol. 4 (12), 2292-2299
- https://doi.org/10.1002/smll.200800203
Abstract
2D arrays of silver semi-shells of 100 and 200 nm diameter display complex reflection and transmission spectra in the visible and near-IR. Here these spectral features are deconstructed and it is demonstrated that they result from the coupling of incident light into a delocalized Bragg plasmon, and the latter's induction of localized Mie plasmons in the arrays. These phenomena permit the excitation of transverse dipolar plasmon resonances in the semi-shells despite an ostensibly unfavorable orientation with respect to normally incident light. The resulting spectral feature in the mid-visible is strong and tunable.Keywords
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