| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Temperature-Dependent Dielectric Characterization of Magneto-Optical Tb$_{3}$Sc$_{2}$Al$_{3}$O$_{12}$ Crystal Investigated by Terahertz Time-Domain Spectroscopy |
| Ju-Geng Li1, Sen-Miao Yang1, Xin Chen2, Nai-Feng Zhuang2, Qi-Biao Zhu1, An-Hua Wu3, Xian Lin1, Guo-Hong Ma1,4**, Zuan-Ming Jin1,4**, Jian-Quan Yao5 |
1Department of Physics, College of Sciences, Shanghai University, Shanghai 200444
2College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108
3Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050
4STU & SIOM Joint Laboratory for Superintense Lasers and the Applications, Shanghai 201210
5College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Optoelectronics, Tianjin University, Tianjin 300072
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| Cite this article: |
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Ju-Geng Li, Sen-Miao Yang, Xin Chen et al 2019 Chin. Phys. Lett. 36 044203 |
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Abstract Terbium scandium aluminum garnet (TSAG) crystals have been widely used in magneto-optical systems. We investigate the complex refractive index of the TSAG crystal in the terahertz frequency range using terahertz (THz) time-domain spectroscopy in the temperature range 100–300 K. It is observed that the refractive index and the absorption coefficient increase with the THz frequency. The refractive index increases with the temperature. We measure the temperature coefficient of the refractive index of the TSAG crystal in the frequency range 0.4–1.4 THz. Furthermore, the loss tangent, i.e., the ratio of experimental values of the imaginary and real part of the dielectric permittivity, is found to be almost independent of frequency. TSAG is very promising for applications in THz optoelectronics because it has a high dielectric constant, low loss, and low thermal coefficient of the dielectric constant.
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Received: 18 January 2019
Published: 23 March 2019
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| PACS: |
42.25.Bs
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(Wave propagation, transmission and absorption)
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77.22.Ch
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(Permittivity (dielectric function))
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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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78.47.-p
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(Spectroscopy of solid state dynamics)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11604202, 11674213, 61735010 and 51572275, the Shanghai Rising-Star Program under Grant No 18QA1401700, the 'Chen Guang' Project under Grant No 16CG45, the Shanghai Municipal Education Commission, and the Shanghai Education Development Foundation. |
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