Manifestation of the spatial Kramers-Kroning relations in plasmonic chiral metasurface

Light-matter interactions can exhibit a strong dissymmetry in chiral structure specifically, the phase and amplitude can be strongly affected by altering the chirality strength. The Kramers-Kronig relation between the imaginary and the real part of the index prescribes the connection between the two measurable effects of the optical activity, namely the optical rotation dispersion (ORD) and the circular dichroism (CD). Our results establish a basis for the development of the metasurface that incorporates structural local chirality for phase modulation.