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Metasurfaces, the two-dimensional analogues of metamaterials, are idealplatforms for sensing molecular chirality at the nanoscale, e.g. of inclusionsof natural optically active molecules, as they offer large accessible areas(they are essentially surfaces) and can accommodate the necessary strongresonances for coupling the probing radiation with the chiral inclusions. Here,we examine theoretically achiral isotropic metasurfaces, and we treat them aspolarizable surfaces that support resonant electric and magnetic currents,which are coupled via the chiral inclusions. We derive analytically, and verifynumerically, expressions that provide insight to the enhancement mechanism ofthe magneto-electric coupling and explain why circular dichroism signals(difference in absorption between left- and right- circularly polarized waves)can arise from both the real and the imaginary part of the chirality parameter$\kappa$. Our analysis demonstrates distinct chiroptical signals where thecontributions from both the real and imaginary part of $\kappa$ can beindependently observed and, based on such measurements, we propose a scheme forthe unambiguous determination of an unknown chirality.

Chiral sensing with achiral isotropic metasurfaces