The dielectric behaviour of doped near-stoichiometric lithium niobate in the terahertz range
Wu Liang(吴亮)a), Ling Fu-Ri(凌福日)a)† , Zuo Zhi-Gao(左志高)a), Liu Jin-Song(刘劲松)a), and Yao Jian-Quan(姚建铨)a)b)
a Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; b College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
Abstract The dielectric properties of near-stoichiometric LiNbO3:Fe and LiNbO3:Ce single crystals have been investigated using terahertz time domain spectroscopy in a frequency range of 0.7-1.6 THz at room temperature. When coupled with an applied external optical field, obvious photorefractive effects were observed, resulting in a modulation of the complex dielectric constant for the crystals. The variation in refractive index, |Δn|, had a linear relationship with the applied light intensity, accompanied by a step-like decrease at high intensity. The findings were attributed to the internal space charge field of the photorefraction and the light-induced domain reversal in the crystals.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974063), the Research Foundation ofWuhan National Laboratory, China (Grant No. P080008), and the National Basic Research Program of China (Grant No. 2007CB310403).
Cite this article:
Wu Liang(吴亮), Ling Fu-Ri(凌福日), Zuo Zhi-Gao(左志高), Liu Jin-Song(刘劲松), and Yao Jian-Quan(姚建铨) The dielectric behaviour of doped near-stoichiometric lithium niobate in the terahertz range 2012 Chin. Phys. B 21 017802
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