Zijuan Ji, Dan Li, Jiaqi Bao. Optical Tuning of Absorption Characteristics of 0.3BaSrTiO3-0.7NdAlO3 Ceramics in the Terahertz Range[J]. Laser & Optoelectronics Progress, 2020, 57(7): 072801
- Laser & Optoelectronics Progress
- Vol. 57, Issue 7, 072801 (2020)
Fig. 1. X-ray diffraction pattern of 0.3BaSrTiO3-0.7NdAlO3 ceramics
Fig. 2. Installation diagram of THz-TDS. A 532 nm laser is obliquely incident upon the surface of the sample at an angle of 45° with the polar axis
Fig. 3. Terahertz time domain waveform of 0.3BaSrTiO3-0.7NdAlO3 ceramics. (a) Time-domain reference and transmission waveforms;(b) time shift under different external optical pump fields at 18 ℃
Fig. 4. Transmission spectra of 0.3BaSrTiO3-0.7NdAlO3 ceramics under different external optical pump intensities at 18 ℃
Fig. 5. Frequency dependence of complex permittivity of 0.3BaSrTiO3-0.7NdAlO3 under different external optical pump intensities at 18 ℃. (a) Real part; (b) imaginary part
Fig. 6. Light power as a function of the dielectric constant of 0.3BaSrTiO3-0.7NdAlO3 ceramics at 0.45 THz and 0.55 THz
Fig. 7. Absorption coefficients changed with frequency and optical power in 0.3BaSrTiO3-0.7NdAlO3. (a) Frequency; (b) optical power
Fig. 8. Tunability of the loss tangent of 0.3BaSrTiO3-0.7NdAlO3 ceramics at 0.45 THz and 0.55 THz as a function of the power at 18 ℃
Fig. 9. Variations of refractive index dependent on the optical power at 0.45 THz and 0.55 THz for 0.3BaSrTiO3-0.7NdAlO3 ceramics
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