Effect of optical pump on the dielectric properties of SrTiO3 in terahertz range

Abstract

Abstract 　　Tuning of the dielectric permittivity spectra of strontium titanate (SrTiO3) single crystals in an external optical field is investigated at room temperature by means of terahertz time-domain spectroscopy. Application of the optical field leads to an appreciable tuning of the permittivity, which reached up to 2.8%. Meanwhile, the dielectric loss changed about 3%. The observed behavior is interpreted in terms of soft-mode hardening due to the anharmonic character of its potential. We also found that the change of refractive index has a linear relationship on scale with the applied light power. These findings were attributed to the linear electro-optic effect caused by internal space charge field of the crystal.

Keywords: THz-materials Optical constants Ferroelectrics

Received: 07 September 2013
Published: 31 October 2013

Fund: ;the Strategic Priority Research Program(B) of the Chinese Academy of Sciences

Cite this article:

. Effect of optical pump on the dielectric properties of SrTiO3 in terahertz range. Chin. Phys. B, , (): 0.

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