Effect of optical pumping on the dielectric properties of 0.55SrTiO3-0.45NdAlO3 ceramics in terahertz range

Abstract. The dielectric properties of 0.55SrTiO3-0.45NdAlO3 ceramics under external optical fields were investigated by terahertz time-domain spectroscopy at room temperature. From the experimental results, it could be found that the tunability of permittivity with the external optical pump was reached up to 16% at 0.6 THz. And the change of refractive index has a linear relationship on scale with the applied external light power. These results could be explained by a built-in electric field caused by the excited free carriers in the ceramics.

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