Thursday, September 11, 2014

Abstract-Visualization of ferroelectric domains in boracite using emission of terahertz radiation

We report on the emission of terahertz radiation by irradiation of femtosecond laser pulses in non-centrosymmetric paraelectric and ferroelectric phases of Co3B7O13I boracite. The Generation of the terahertz waves in both phases is caused by optical rectification via a second-order nonlinear optical effect. In the ferroelectric phase, we successfully visualized ferroelectric domains by analyzing the polarization state of the terahertz wave radiated from the crystal. In a large area of the crystal ( 500 × 500 μm2), the observed polarization vector of the radiated terahertz wave was tilted from directions of spontaneous polarization, i.e., [100]cub, [010]cub, and [001]cub in cubic setting, which can be explained by the presence of a ferroelectric 90 domain wall of the (101)cub plane.

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