Experiment and analysis of external optical pump modulation for the 0.3BaSrTiO3-0.7NdAlO3 ceramic's characteristics in terahertz range

Jiaqi Bao; Juanjuan Yin; Yilin Tong; Kan Yu

doi:10.1117/12.2603927

13 December 2021 Experiment and analysis of external optical pump modulation for the 0.3BaSrTiO₃-0.7NdAlO₃ ceramic's characteristics in terahertz range

Jiaqi Bao, Juanjuan Yin, Yilin Tong, Kan Yu

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Proceedings Volume 12074, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Novel Optoelectronic Functional Materials and Devices; 120740F (2021) https://doi.org/10.1117/12.2603927
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Terahertz time-domain spectroscopy was used to make experiment and investigation for the characteristics of high quality 0.3BaSrTiO₃-0.7NdAlO₃ ceramics in the terahertz range, which was made by the solid state reaction method. The frequency resolution of experiment system was 4.5 GHz, and all-solid-state 532nm laser was used as external optical pump, which obliquely incidence on the surface of the sample at the angle of 45°. From the experiment that when the external optical pump’s intensity increased from 0 mW to 300 mW at room temperature, the 0.3BaSrTiO₃-0.7NdAlO₃ ceramics’ transmission waveform time shifts could be obviously observed, and with the increasing power of pump laser, the absorption coefficient could be modulated, the modulation range varied from 21.38 cm^-1 to 13.77 cm^-1 and the modulation depth nearly reached up to 36% at 0.55 THz. Further analysis showed that the micro-mechanism of absorption coefficient modulation with the intensity of external optical pump was attributed to the internal space charge field in the 0.3BaSrTiO₃-0.7NdAlO₃ ceramics caused by the excited free carriers. The experiment and analysis proved that the 0.3BaSrTiO₃-0.7NdAlO₃ ceramics have higher tunability, lower dielectric loss and good temperature stability in THz range, which will have good reference value and wide application for communication in THz range.

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Jiaqi Bao, Juanjuan Yin, Yilin Tong, and Kan Yu "Experiment and analysis of external optical pump modulation for the 0.3BaSrTiO₃-0.7NdAlO₃ ceramic's characteristics in terahertz range", Proc. SPIE 12074, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Novel Optoelectronic Functional Materials and Devices, 120740F (13 December 2021); https://doi.org/10.1117/12.2603927

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KEYWORDS

Ceramics

Terahertz radiation

Dielectrics

Absorption

Modulation

Refractive index

Scanning electron microscopy

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