Terahertz radiation by ultrafast spontaneous polarization modulation in multiferroic BiFeO${}_3$ thin films

Kouhei Takahashi, Noriaki Kida, Masayoshi Tonouchi

Terahertz (THz) radiation has been observed from multiferroic BiFeO${}_3$ thin films via ultrafast modulation of spontaneous polarization upon carrier excitation with illumination of…