Abstract
The optical activity of the homogeneous and heterogeneous single dimers and metasurfaces composed of dimers, as a unit cell, are studied thoroughly. For the theoretical results nanorods are modeled with prolate spheroid and the CDA is used to investigate the interaction between them. It is shown that different absorption of the bonding and anti-bonding modes for circular polarized incident waves are responsible for observing circular dichroism (CD) in these nanostructures. It is seen that the heterogeneous dimer and similarly metasurface have broader CD spectrum comparing to the homogenous structures. The theoretical results are well supported by the simulation results.
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