Controlling Terahertz Surface Plasmon Properties on a Periodically Structured Silicon Surface

Figure 4

(a) Numerically examined frequency domain spectra for the four patterned substrates with different heights from  µm to  µm of the vertical square shape structures. The other parameters are “” = 200 µm, “” = 200 µm, and “” = “” = 400 µm. (b) The electric field profile in the plane at 0.36 THz depicts a strong confinement at this frequency. “” points to the electric field normal to the surface while points to the direction of propagation of terahertz surface plasmons.

(a)

(b)