Fig. 4: Spectral bandwidth and polarization dependence of the THz generation.
From: Broadband terahertz wave generation from an epsilon-near-zero material
a THz spectra (red) and noise spectra (grey) generated from the ITO film in both the transmission and reflection configurations, with 0.1 and 1 mm-thick ZnTe crystals serving as the detector. b Schematic illustration of the pump light, ITO film, and THz emission. θ and φ represent the polarization angle and azimuthal angle of the ITO film, respectively. c, d Polar graphs of the p-component and s-component THz amplitude as a function of the polarization angle θ in the transmission configuration. The p-component THz amplitude well fits the sin2(θ) function, indicated by the dashed lines. e Azimuthal angle φ dependence of the THz generation in the transmission configuration
