Liu, Mingkai; Powell, David A.; Shadrivov, Ilya V.; Kivshar, Yuri S.
We analyse the optical activity in twisted dimers, the meta-atoms of a chiralmetamaterial, by introducing a simple yet accurate model for the coupling between them. The near-field interaction coefficients are derived from a Lagrangian model and include the effects of retardation, whereas the far-field radiation is based on a multipole expansion. We show that the optimum twist angle varies with frequency, and near resonance is substantially lower than 45 degrees, which is the lowest symmetry...[Show more]
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