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We experimentally demonstrate tunable radiation from a periodic array of plasmonic nanoscatterers, tailored to convert surface plasmon polaritons into directive leaky modes. Extending our previous studies on efficient directional beaming based on leaky-wave radiation from periodic gratings driven by a subwavelength slit, we experimentally show dynamic beam sweeping by tuning the directional leaky-wave mechanism in realtime. Two alternative tuning mechanisms, wavelength-and index-mediated beamdoi:10.1364/oe.21.002748 pmid:23481732 fatcat:dib6nhdewfcrxpqkuoyiiuwa5a