| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optically tuned dielectric characteristics of SrTiO3/Si thin film in the terahertz range |
| Bin Zou(邹斌)1,3, Qing-Qing Li(李晴晴)1,2, Yu-Ping Yang(杨玉平)1,3,†, and Hai-Zhong Guo(郭海中)2,4,‡ |
1 School of Science, Minzu University of China, Beijing 100081, China;
2 School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China;
3 Optoelectronics Research Center, Minzu University of China, Beijing 100081, China;
4 Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China |
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Abstract Active control of the optical parameters in strontium titanate (SrTiO3, STO) thin films is highly desirable for tunable terahertz (THz) integrated devices such as filters, phase modulators, and electro-optical devices. In this work, optically tuned dielectric parameters of a STO thin film epitaxially grown on a silicon wafer were characterized in the THz region with an 800 nm laser pump-THz detection system. The refractive index, extinction coefficient, and complex dielectric constant of the STO thin film were calculated using thin-film parameter extraction. Owing to carrier transportation and soft-mode oscillation, the above optical parameters changed notably with the pump power of the external laser. This study is of great significance for rapid and non-contact THz phase-modulation technology and may serve as a powerful tool to tune the dielectric properties of the STO thin films.
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Received: 19 March 2021
Revised: 04 May 2021
Accepted manuscript online: 25 May 2021
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PACS:
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78.47.jh
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(Coherent nonlinear optical spectroscopy)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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78.66.-w
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(Optical properties of specific thin films)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62075248), the National Key R&D Program of China (Grant Nos. 2017YFB0405400 and 2020YFB2009300), and the Program for the Innovation Team of Science and Technology in University of Henan, China (Grant No. 20IRTSTHN014). |
Corresponding Authors:
Yu-Ping Yang, Hai-Zhong Guo
E-mail: ypyang@muc.edu.cn;hguo@zzu.edu.cn
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Cite this article:
Bin Zou(邹斌), Qing-Qing Li(李晴晴), Yu-Ping Yang(杨玉平), and Hai-Zhong Guo(郭海中) Optically tuned dielectric characteristics of SrTiO3/Si thin film in the terahertz range 2021 Chin. Phys. B 30 107802
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