Abstract
Knowledge of the plasmonic band structure is crucial for the fundamental understanding and better control of electromagnetic waves in periodic optical metamaterials. Here, we probe the plasmonic band structure of the important fishnet metamaterial by angle- and polarization-resolved optical spectroscopy. We show that multiple ``magnetic'' plasmon bands exist in the fishnet metamaterial, and they display interesting dispersion behavior. We can understand the plasmon bands qualitatively using a band-structure zone-folding picture. Interestingly, some plasmon resonances have wave-vector-dependent coupling, and the corresponding plasmon bands exhibit anticrossing behavior due to hybridization of the plasmonic waves.
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