Abstract
We investigate the working mechanism of a plasmon field-effect transistor (FET) based on the modulation of surface plasmon polariton (SPP) flow by varying an external electric field. SPP flow propagates at the surface of a metal strip waveguide embedded in a dielectric medium. The external electric field is applied to the metal electrode located under the isolated metal nanoplate placed in the middle of the strip waveguide. In this case, a signal on the control electrode changes the permittivity of the near-surface layer of the nanoplate. Thus, the control signal modulates the intensity of the SPP signal transmitted at the surface of the strip waveguide.
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