Strong Discontinuities in the Complex Photonic Band Structure of Transmission Metallic Gratings
S. Collin, F. Pardo, R. Teissier, J. -L. Pelouard
Abstract
Complex photonic band structures (CPBS) of transmission metallic gratings with rectangular slits are shown to exhibit strong discontinuities that are not evidenced in the usual energetic band structures. These discontinuities are located on Wood's anomalies and reveal unambiguously two different types of resonances, which are identified as horizontal and vertical surface-plasmon resonances. Spectral position and width of peaks in the transmission spectrum can be directly extracted from CPBS for both kinds of resonances.
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