Intense THz-assisted modulation of semiconductor optical properties

摘要

We use intense THz pulses of different generation schemes to excite optical phonons or to induce acceleration of electrons in methylammonium lead halide perovskites. THz induced transient spectra over a broad visible range including the band gap are detected by femtosecond visible pulses. We observe both resonant and non-resonant modulations of optical transmittance near the band gap. We model both contributions in time- and probe frequency domain.