Mie and Bragg plasmons in subwavelength silver semi‐shells

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Small

Volume

4

Issue

12

First Page

2292

Last Page

2299

Publication Date

12-2008

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.

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Disciplines

Physics

Keywords

Plasmons (Physics); Surface plasmon resonance; Silver

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