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In recent years, there has been intensive investigation of surface plasmonpolaritons (SPPs) in the science and engineering fields. Understanding thephysics of surface plasmon excitation is essential to the manipulation of SPPs,and most existing studies focus on (-1,0)-type SPP excitation. In this article,we report our recent investigation of the (0,+/- 1)-type SPP excitation of agold two-dimensional nano-cavity array using finite-difference time-domainmethodology. Our particular focus is on the symmetry properties of (0,+/-1)-SPPs excited by different polarizations of light. It is found thatpolarization has strong implications for the field distribution of thecorresponding SPPs. As a result, the control of polarization may provideimportant insights into the manipulation of SPPs.

Structural Symmetry of Two-dimensional Metallic Arrays: Implications for Surface Plasmon Excitations