Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna
Abstract
Plasmonic antennas with helical geometry are capable transducers between linearly polarized dipole emission and purely circular polarized far-fields. Besides large Purcell enhancements they possess a wide tunability due to the geometry dependence of their resonant modes. Here, the coupling of a dipole emitter embedded in a thin film to plasmonic single and double helices is numerically studied. Using a higher-order finite element method (FEM) the wavelength dependent Purcell enhancement of a dipole with different positions and orientations is calculated and the far-fields with respect to their chirality and radiation patterns are analyzed. Both single and double helices demonstrate highly directional and circularly polarized far-fields for resonant excitation but with significantly improved directional radiation for the case of double helices.
Keywords
Cite
@article{arxiv.2402.00664,
title = {Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna},
author = {Lilli Kuen and Lorenz Löffler and Aleksei Tsarapkin and Lin Zschiedrich and Thorsten Feichtner and Sven Burger and Katja Höflich},
journal= {arXiv preprint arXiv:2402.00664},
year = {2024}
}