Presentation Information
[25a-11E-9]Emission of Terahertz Waves and Visualization of Ferroelectric Domains in Perovskite-type Ferroelectric Semiconductor CsGeI3 Single Crystal
〇(B)Hiroaki Fujikawa1, Masato Sotome1,2, Takashi Kondo1,2 (1.Facul. Eng. Univ. of Tokyo, 2.RCAST Univ. of Tokyo)
Keywords:
terahertz,ferroelectrics,metal halide perovskite
The metal halide perovskite semiconductor CsGeI3 (Eg~1.6 eV) exhibits strong ferroelectric polarization comparable to BaTiO3 at room temperature, making it a promising candidate for applications in photonics. However, its nonlinear optical properties and ferroelectric domain structure have been little studied. In this study, we discovered the generation of terahertz (THz) waves upon 1560 nm femtosecond laser irradiation of solution-grown CsGeI3 single crystals. We discuss the mechanisms and efficiency of THz wave generation in the crystals and further explore the features of the ferroelectric domain structure visualized by mapping the THz amplitudes.