THz spectra of five borates crystals |
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| Authors: | BiHui Hou YaLi Wang YiCheng Wu Hua Chen Li Wang PengZhen Fu FengYan Liu |
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| Institution: | [1]College of Applied Sciences, Beijing University of Technology, Beijing 100022, China [2]Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China [3]Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Terahertz spectral responses have been studied for five borate crystals Na5B2P3O13] (NBP), Zn3BPO (ZBP), SrB4O7 (SBO), Na3La9O3(BO3)8 (NLBO) and PbB4O7 (PBO). It is found that the samples had good transmission in 0.25–1.5 THz region. Both SBO and NLBO have an absorption coefficient
less than 10 cm−1. Among them, SBO has not only the smallest absorption coefficient but also a very flat dispersion in the frequency region
under investigation. Distinct resonance absorption peaks are observed for ZBP at v
1 = 1.4 THz, v
2 = 2.0 THz and SBO at v = 2.4 THz. In the spectrum of PBO, two abnormal dispersions appear in the frequency regions 1.44–1.74 and 2.2–2.5 THz. The
absorption coefficients and refraction indices of the five crystals are extracted from the THz time-domain (THz-TDS) spectra
in 0.25–2.5 THz region. The properties and origins of the spectral responses are addressed.
Supported by the National Natural Science Foundation of China (Grant Nos. 50672104 and 10390160) |
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| Keywords: | borates crystals THz spectroscopy lattice vibrations optical phonon |
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