Visualization of ferroelectric domains in boracite using emission of terahertz radiation

• DOI: 10.7567/jjap.53.09pd08
• Publication Date: 2014-09-03T08:18:57Z
• Authors: Yuto Kinoshita; Noriaki Kida; Masato Sotome; Ryotaro Takeda; Nobuyuki Abe; Mitsuru Saito; Taka-hisa Arima; Hiroshi Okamoto
• Keywords: Optical rectification; Terahertz time-domain spectroscopy

We report on the emission of terahertz radiation by irradiation femtosecond laser pulses in non-centrosymmetric paraelectric and ferroelectric phases Co3B7O13I boracite. The generation waves both is caused optical rectification via a second-order nonlinear effect. In phase, we successfully visualized domains analyzing polarization state wave radiated from crystal. large area crystal (∼500 × 500 µm2), observed vector was tilted directions spontaneous polarization, i.e., , cubic setting, which can be explained presence 90° domain wall plane.