Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna
arxiv(2024)
摘要
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.
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