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O: Fachverband Oberflächenphysik

O 27: Plasmonics and nanooptics: Light-matter interaction, spectroscopy – Poster

O 27.1: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Charge reservoir as a design concept for plasmonic antennas — •Rostislav Řepa, Michal Horák, Tomáš Šikola, and Vlastimil Křápek — Brno University of Technology, Brno, Czechia

Plasmonic antennas exploit localized surface plasmons to shape, confine, and enhance electromagnetic fields with subwavelength resolution. The field enhancement is contributed to by various effects, such as the inherent surface localization of plasmons or the plasmonic lightning-rod effect [1]. Inspired by nanofocusing observed for propagating plasmons [2], we test the hypothesis that plasmonic antennas with a large crosssection represent a large charge reservoir, enabling large induced charge and field enhancement. Our study reveals that a large charge reservoir is accompanied by large radiative losses, which are the dominant factor, resulting in a low field enhancement.

[1] Křápek et al., arXiv:2407.09454.

[2] Babadjanyan et al., J. Appl. Phys. 87, 3785-3788 (2000).

Keywords: plasmonics; plasmonic antenna; electric near field