Abstract
Interference patterns of surface plasmon polaritons (SPPs) are observed in the extraordinary optical transmission through subwavelength holes in an optically thick metal plate. It is found that the phase of incident light can be transferred to SPPs. We can control the destructive and constructive interferences of SPPs by modulating the relative phase between two incident beams. Using a slightly displaced Mach–Zehnder interferometer, we also observe a SPP interference pattern composed of bright and dark stripes.
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