Abstract
The dielectric properties of near-stoichiometricLiNbO3:Ce (near-SLN:Ce) single crystal have been investigated by using terahertz time domain spectroscopy(THz-TDS) in a frequency range of 0.7–1.6 THz at room temperature. When coupled with anapplied external optical field, a photorefractive effect was observed, resulting in the modulationof the complex dielectric constant for near-SLN:Ce. The variation of the refractive index|Δn| has a linear relationship in scale with the applied light intensity accompaniedwith an abrupt decrease. These findings were attributed to the internal spacecharge field of photorefraction and the light-induced domain reversal in the crystal.
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