| Abstract Scope |
We present an analytical model capable of predicting both the time- and frequency-domain response of lattice polarization in ferroelectric materials to terahertz (THz) electromagnetic waves of arbitrary waveform as well as the concurrent THz wave transmission. The validity of the analytical model is demonstrated by independent dynamical phase-field simulations of the coupled dynamics of lattice polarization, strain, and electromagnetic waves. We then present the application of this analytical model to a wide range of ferroelectric materials, including BaTiO3, strained SrTiO3, Al1-xScxN, GaN, LiNbO3, and the resulting heterostructures and multilayers. This analytical model provides a theoretical foundation for extracting thermodynamic and kinetic parameters of ferroelectric materials from THz transmission experiments. The results also predict emergent phenomena such as the chirality reversal of circularly polarized THz pulses and strain-enabled giant nonlinear susceptibility, offering new avenues for THz wave modulation.This work was performed in collaboration with A. Ross, X. Guo, V. Gopalan, L.-Q. Chen, Y. Gu, and S. Pasayat. |