Abstract
In this paper, an observation of chiral gap plasmons that induce strong optical chirality, spectroscopic circular dichroism (CD), and near-field enhancement in a planar metallic nanostructure is reported. The resulting chiral nanostructure consists of artificial gold nanoscale elements which are periodically fabricated on a glass substrate. The measured extinctions of the structure under linearly polarized light illumination are in good agreement with numerical calculations of extinction cross-sections. The dissymmetry of the extinctions under left- and right-handed circular polarization is correlated to the far-field CD of the chiral nanostructure that yields a strong CD of up to 0.02. Near-field enhancement of up to 20 times and a large local optical chirality is numerically found at a plane 5 nm above the chiral nanostructure. The finding of chiral gap plasmons that induce strong optical chirality is experimentally demonstrated to enhance interaction between achiral dye molecule and chiral gap plasmon, emitting circularly polarized luminescence with a dissymmetry factor of up to 0.15.
Published Version
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