Mie and Bragg plasmons in subwavelength silver semi‐shells

• Main Authors: Maaroof, Abbas I., Cortie, Michael B., Harris, Nadine, Wieczorek, Lech
• Format: text
• Published: Animo Repository 2008
• Subjects: Plasmons (Physics); Surface plasmon resonance; Silver; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/8172
• Institution: De La Salle University

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.