Phys. Rev. Lett. 103, 213902 (2009) [4 pages]Electric and Magnetic Dipole Coupling in Near-Infrared Split-Ring Metamaterial ArraysReceived 17 July 2009; revised 1 October 2009; published 20 November 2009 We present experimental observations of strong electric and magnetic interactions between split ring resonators (SRRs) in metamaterials. We fabricated near-infrared planar metamaterials with different inter-SRR spacings along different directions. Our transmission measurements show blueshifts and redshifts of the magnetic resonance, depending on SRR orientation relative to the lattice. The shifts agree well with simultaneous magnetic and electric near-field dipole coupling. We also find large broadening of the resonance, accompanied by a decrease in effective cross section per SRR with increasing density due to superradiant scattering. Our data shed new light on Lorentz-Lorenz approaches to metamaterials. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.213902
DOI:
10.1103/PhysRevLett.103.213902
PACS:
42.70.−a, 42.25.−p, 78.20.Ci
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