Figure 3
Spectral transmittance of the transient wire-grid polarizer. (a) Power transmittance of the Si slab 60 ps after excitation with the pump intensity pattern of Figure 1b, referenced to the unexcited slab. The spectra demonstrate that the transient structure acts as a polarizer. (b) Spectral phase shift, revealing the more metallic behavior (negative phase shift) of the structure for THz radiation polarized parallel to the transient wires. Solid lines are model calculations based on effective-medium theory, without using any fit parameters. THz, terahertz.
