Figure 2
From: Electrical terahertz modulator based on photo-excited ferroelectric superlattice

Transmission of the two samples. (a) Transmission of the two samples without interdigital electrodes as function of the external optical pumped powers. (b) Transmission of the sample A with the electric voltages at optical powers P = 0, 100, 200, 300, 400 mW, respectively. (c) Transmission of the sample B with the electric voltages at optical powers P = 0, 100, 200, 300, 400 mW, respectively.