Incidence dependence of negative index in asymmetric cut wire pairs metamaterials

Burokur, Shah Nawaz; Lepetit, Thomas; Lustrac, André de
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p191114
Academic Journal
Metamaterials made of asymmetric cut wire pairs have experimentally demonstrated a negative refractive index at microwave frequencies. In this letter, we begin by presenting the analogy between asymmetric cut wire pairs and S-shaped metamaterials by a simple unifying approach. Then, using simulations and experiments in the microwave domain, we investigate the dependence of resonances and retrieved effective index on the incident angle in asymmetric cut wire pairs. While it is found that resonances shift in frequency with increasing oblique incidence in the E-plane, it is shown that the structure is angle-independent in the H-plane.


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