THz spectra of five borates crystals

查看全文 作　　者：HOU [1]BiHui;WANG [1]YaLi;WU [2]YiCheng;CHEN [3]Hua;WANG [3]Li;FU [2]PengZhen;LIU [1]FengYan

机构地区：[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

出　　处：《Chinese Science Bulletin》索引2008年第53卷第1期,共4页

基　　金：the National Natural Science Foundation of China (Grant Nos. 50672104 and 10390160) 摘　　要：Terahertz spectral responses have been studied for five borate crystals Na5[B2P3O13] (NBP), Zn3BPO (ZBP), SrB4O7 (SBO), Na3La9O3(BO 3)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 cm1. 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 ν1 = 1.4 THz, ν2 = 2.0 THz and SBO at ν = 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. 关键词：硼酸盐晶体光谱学晶格振动光学声子

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THz spectra of five borates crystals

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