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Bistable physical geometries for terahertz plasmonics using shape memory alloys

We demonstrate the applicability of shape memory alloys for creating THz plasmonic structures that can be reversibly reconfigured. This is accomplished by training nickel titanium alloy free-standing foils to have two bistable temperatures between which the physical structure can be switched thermally. Specifically, we show that the metal foil can be switched between a flat foil and one that has either a one-dimensional or two-dimensional corrugation. By perforating the metal foil with a periodic array of subwavelength apertures, we show the transmission spectrum can be thermally switched easily.