We design and demonstrate experimentally a plasmonic directional beaming device with an expected beam angle, which consists of a slit-grooves structure in Au/Cr metal layers. The directional beaming phenomenon is achieved by modulating the phases of the radiation light diffracted by grooves from surface plasmon polariton and controlling the wavefront of the transmitted light to propagate toward the desired direction. The transmitted field through the demonstration beaming device is simulated with finite-difference time-domain method and visualized using scanning near-field optical microscope. The simulation and experimental results both show a significant directional beaming effect and are in good agreement with theoretical expectation. Such a plasmonic beaming device has potential applications in optical interconnection, display, and illumination.
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