High quality resonances for terahertz radiation diffraction at periodically corrugated semiconductor interfaces

Surface plasmon-polariton resonance at diffraction of THz radiation on semiconductor gratings

“…In contrast to this, in the THz region metals behave as approximately perfect conductors that results in a weak SPP localization within the adjacent dielectric and a huge free path length. Actually, the terahertz SPP at a flat metal loses its surface nature and its existence calls into question.Meanwhile, many semiconductors possess optical properties allowing efficient THz SPP excitation, propagation and manipulation without any additional treatment [5][6][7][8]. It is due to the fact that the dielectric permittivity of these semiconductors in THz is analogous to that of metals in the visible spectrum range.…”

“…Meanwhile, many semiconductors possess optical properties allowing efficient THz SPP excitation, propagation and manipulation without any additional treatment [5][6][7][8]. It is due to the fact that the dielectric permittivity of these semiconductors in THz is analogous to that of metals in the visible spectrum range.…”

“…A simple explanation of experimental results follows from the analytical theory [7,8,12,13]. Let a plane p-polarized wave,…”

“…r G ξ → ξ + Γ + Respectively, in the diffraction problem under examination we have to change the resonance denominator as follows, . r r r G ∆ → β + ξ + Γ + (8) Consequent transformations are to be performed in Eqs. (4), (5) as well, resulting in…”