Figure 4
From: Electrical terahertz modulator based on photo-excited ferroelectric superlattice
Measured permittivity of ferroelectric superlattice in the sample B. (a,b and c) Were measured real parts of dielectric constant biased at −40V, −20V, 0 V, 20 V, 40 V with the optical pump power of 0, 200 and 400 mW, respectively. (d,e and f) were measured imaginary parts of dielectric constant corresponding to (a,b and c), respectively.
