Abstract
In this work, we study chiral effects in well-known 2D plasmonic nanohole arrays with a triangular unit cell. The chirality can be induced by moving from circular to elliptical nanohole shape and tilting the ellipse away from the array symmetry. This symmetry breaking induces a different absorption of the circularly polarized light of opposite handedness, i.e. circular dichroism. We numerically study circular dichroism at normal incidence in elliptic nanoholes in Au in the spectral range 400-1000 nm. CD arises in transmission and absorption spectra in the same wavelength region of extraordinary optical transmission, indicating highly resonant light-metasurface coupling mechanisms. We focus on its dependence on the elliptic nanohole tilt and further proceed with the ellipse radii optimization. The optimized CD is on the order of 80%, and it is robust with respect to the radii and rotation angle variations. Moreover, such samples could be produced by means of low-cost nanosphere lithography, which makes them interesting for applications in enhanced sensing of chiral biomolecules.
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