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Mie and Bragg Plasmons in Subwavelength Silver Semi‐Shells
Author(s) -
Maaroof Abbas I.,
Cortie Michael B.,
Harris Nadine,
Wieczorek Lech
Publication year - 2008
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200800203
Subject(s) - plasmon , delocalized electron , materials science , surface plasmon , optics , localized surface plasmon , visible spectrum , mie scattering , transverse plane , ray , dipole , optoelectronics , light scattering , physics , scattering , structural engineering , quantum mechanics , engineering
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.