Electro-optic detection of terahertz radiation

The frequency-domain analysis used for the electro-optic (EO) detection of terahertz electromagnetic radiation is described, including the ellipsometry technique employed. Frequency domain results show the effect of EO detection of a pulse of THz radiation as the product of three spectral filters acting on the complex amplitude spectrum of the THz pulse that is entering the EO crystal. If the product of these filter functions had a smooth spectral response much broader than the incoming spectrum of the THz pulse, the measured EO signal would be essentially the same as the THz pulse that was entering the EO crystal.