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

doi:10.1088/1674-1056/23/3/034212

Abstract Tuning 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. The application of the optical field leads to an appreciable tuning of the permittivity, reaching up to 2.8%, with the dielectric loss changing about 3%. The observed behavior is interpreted in terms of soft-mode hardening due to the anharmonic character of its potential. We also find that the change of the refractive index responds linearly to the applied light power. These findings are attributed to a linear electro-optical effect of the internal space charge field of the crystal.

Keywords: THz materials optical constants ferroelectrics

Received: 06 September 2013
Revised: 18 September 2013
Accepted manuscript online:

PACS:	42.70.-a	(Optical materials)
	78.20.Ci	(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
	77.80.-e	(Ferroelectricity and antiferroelectricity)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61205096 and 61271066).

Corresponding Authors: Wu Liang
E-mail: wuliang@tju.edu.cn

Cite this article:

Wu Liang (吴亮), Jiang Lin-Kun (蒋霖坤), Yuan Cai (袁偲), Ding Xin (丁欣), Yao Jian-Quan (姚建铨) Effect of optical pump on the dielectric properties of SrTiO₃ in terahertz range 2014 Chin. Phys. B 23 034212

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

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