Terahertz Radiation by an Ultrafast Spontaneous Polarization Modulation of Multiferroic BiFeO3 Thin Films

作者：Kouhei Takahashi, N. Kida, Masayoshi Tonouchi · 发表于：Physical Review Letters · 年份：2006 · DOI：10.1103/physrevlett.96.117402 · 被引用次数：243 · 研究领域：Acoustic Wave Resonator Technologies、Ultrasonics and Acoustic Wave Propagation、Ferroelectric and Piezoelectric Materials

Terahertz (THz) radiation has been observed from multiferroic BiFeO3 thin films via ultrafast modulation of spontaneous polarization upon carrier excitation with illumination of femtosecond laser pulses. The radiated THz pulses from BiFeO3 thin films were clarified to directly reflect the spontaneous polarization state, giving rise to a memory effect in a unique style and enabling THz radiation even at zero-bias electric field. On the basis of our findings, we demonstrate potential approaches to ferroelectric nonvolatile random access memory with nondestructive readability and ferroelectric domain imaging microscopy using THz radiation as a sensitive probe.