Mie and Bragg plasmons in subwavelength silver semi-shells.
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.
Maaroof
Abbas I
AI
Institute for Nanoscale Technology, University of Technology, Sydney PO Box 123, Broadway NSW 2007, Australia.
Cortie
Michael B
MB
Harris
Nadine
N
Wieczorek
Lech
L
D053758:Nanoparticles / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance
D011137:Polystyrenes; D012834:Silver