Application of epsilon-near-zero (ENZ) metamaterials on Smith-Purcell Terahertz radiation

Abstract For a specific desired frequency, the ENZ metamaterials expose a near-zero reply within the real part of their dielectric permittivity. The performance of the EM field in vicinity of these materials is surprisingly exciting. By means of proximity interaction of moving high kinematic electrons near the surface of an ENZ loaded ۱D holed array slab, low-frequency equivalent of surface Plasmon is agitated. Owed to electron-Plasmon momentum attraction force, flow of EM energy grows within the holes and consequently magnifies the energy. This will reduces the working current while the output power upsurges. At correct integer frequency multiplication harmonics of this “spoof” surface Plasmon (SSP), as a result of periodicity of the structured hole-array, a phase change process (ukmlapp process) develops which redshifts the SSP’s momentum above the light cone making terahertz wave radiations. Keywords: Epsilon-near-zero; Smith-Purcell radiation; Maxwell-Garnet effective medium theory; Terahertz source