Аннотация:We present measurements of the transmission of terahertz radiation through periodic arrays of holes made in highly doped silicon wafers. The size of the holes, $70\ifmmode\times\else\texttimes\fi{}70\ensuremath{\mu}\mathrm{m},$ is significantly smaller than the radiation wavelength $\ensuremath{\lambda}\ensuremath{\simeq}500\ensuremath{\mu}\mathrm{m}.$ Sharp resonances and enhanced transmissions are observed. This unusual transmission is attributed to the resonant tunneling of surface-plasmon polaritons that can be excited on doped semiconductors at terahertz frequencies.
