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Circularly dichroic metasurfaces are highly sought for a plethora of applications; while many alternative options are present in the literature, it is hard to select an approach that combines high circular dichroism (CD) with stable performances and easy reproducibility. In this work, we have designed and experimentally investigated a planar plasmonic metamaterial based on a comma-shaped geometry, which features such characteristics. We have focused the complexity of realization in the design process, which combines intrinsic chirality and high field localization, while fabrication was executed by using a standard single-step lift-off procedure. We have produced two classes of samples, closely related in shape but differing slightly in designing method and results, both reaching high levels of CD. Experiments on the first reveal the sensibility of the metasurface to geometrical variations due to fabrication non …
Optical Society of America
Publication date: 
1 Nov 2019

Andrea Veroli, Badrul Alam, Luca Maiolo, Francesco Todisco, Lorenzo Dominici, Milena De Giorgi, Giorgio Pettinari, Annamaria Gerardino, Alessio Benedetti

Biblio References: 
Volume: 36 Issue: 11 Pages: 3079-3084