Thermally controlled multiband, mode-switching plasmonic filter operating at terahertz frequencies

A thermally controlled multiband, mode-switching plasmonic filter with periodic subwavelength metal asterisk-shaped air hole arrays has been proposed in the terahertz range. Utilizing the changing properties to terahertz wave propagating on the metal-semiconductor interface and in the semiconductor InSb at varying temperature, thermally controlled multiband, mode-switching plasmonic filter owns an excellent tuning ability to terahertz wave. The simulation results show that the maximum transmittance of the structure is 99.8% at 434GHz, 80K, the bandwidths at 80K are 56GHz at 0.434THz, 14GHz at 944GHz and maximum intensity modulation depth could reach to 99.8% at 434 GHz between 80 K and 373 K.