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| PbB_4O_7晶体的太赫兹光谱和软光学声子 | |
| 引用本文： | 侯碧辉,菅彦珍,王雅丽,张尔攀,傅佩珍,汪力,钟任斌.PbB_4O_7晶体的太赫兹光谱和软光学声子[J].物理学报,2010,59(7):4640-4645. |
| 作者姓名： | 侯碧辉 菅彦珍 王雅丽 张尔攀 傅佩珍 汪力 钟任斌 |
| 作者单位： | 1. 北京工业大学应用数理学院,北京,100124 2. 中国科学院研究生院材料科学与光电技术学院,北京,100049 3. 中国科学院研究生院材料科学与光电技术学院,北京,100049;中国科学院理化技术研究所人工晶体研究发展中心,北京,100190 4. 中国科学院理化技术研究所人工晶体研究发展中心,北京,100190 5. 中国科学院物理所光物理实验室,北京,100190 6. 电子科技大学物理电子学院太赫兹研究中心,成都,610054 |
| 基金项目： | 国家重点基础研究发展计划(批准号:2007CB310401)和国家自然科学基金(批准号:50672104)资助的课题. |
| 摘 要： | 对实验测量的PbB4O7晶体样品的太赫兹(1012Hz)光谱、拉曼光谱以及红外—可见—紫外光谱进行了分析.在0.25—2.5THz波段介电函数随频率变化曲线ε(ν)出现共振型尖峰.四方面的分析表明PbB4O7晶体中存在软光学声子:1)介电函数随频率的变化曲线ε(ν)满足LST(Lyddane-Sachs-Teller)关系;2)在共振峰的频率附近(3.10THz)有很强的拉曼散射峰;3)吸收系数随频率的变化曲线α(ν)满足极化激元的特征;4)透过晶体的光子的色散关系ν(k)发生断开的畸变.PbB4O7晶体中存在软光学声子的意义在于,在满足产生极化激元的条件下,透过晶体的光子的频率会发生劈裂,分为升高和降低的两支,有可能利用这种原理来改变光子的频率. |
| 关 键 词： | 极化激元 太赫兹光谱 拉曼光谱 紫外—可见—红外光谱 |
| 收稿时间： | 2009-09-16 |
Terahertz spectra and soft optical phonons of PbB4O7crystal |
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| Hou Bi-Hui,Jian Yan-Zhen,Wang Ya-Li,Zhang Er-Pan,Fu Pei-Zhen,Wang Li,Zhong Ren-Bin.Terahertz spectra and soft optical phonons of PbB4O7crystal[J].Acta Physica Sinica,2010,59(7):4640-4645. | |
| Authors: | Hou Bi-Hui Jian Yan-Zhen Wang Ya-Li Zhang Er-Pan Fu Pei-Zhen Wang Li Zhong Ren-Bin |
| Institution: | College of Applied Science, Beijing University of Technology, Beijing 100124, China;College of Applied Science, Beijing University of Technology, Beijing 100124, China;College of Materials Science and Optoelectronic Technology, Graduate University of Chinese Academy of Sciences, Beijing 100049, China;College of Materials Science and Optoelectronic Technology, Graduate University of Chinese Academy of Sciences, Beijing 100049, China;Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Terahertz Science and Technology Research Center, School of Physical Electronics, University of Electronic Science & Technology, Chengdu 610054, China |
| Abstract: | The terahertz(1012Hz)spectra, Raman spectra and infrared-visible-UV spectra are analyzed for PbB4O7 crystal sample. A resonance peak appears in the curve of the dielectric function ε(ν) in the frequency range of 0.25—2.5 THz. The analysis supports that soft optical phonons exist in PbB4O7 crystal from four aspects: 1) the change curve ε(ν) of the dielectric function satisfies the Lyddane-Sachs-Teller relation; 2) a strong Raman scattering peak appears in the vicinity of resonance frequency (3.10 THz); 3) absorption coefficient curve α(ν) meets the characteristics of polaritons; 4) the dispersion relation curve ν(k) of the photon transmitting from the crystal reveals a frequency gap. The soft optical phonon exists in PbB4O7 crystal, which means that the frequency curve of the photon transmitting from the crystal will suffer splitting when the condition of producing polariton is satisfied. And the dispersion curve splits a higher branch and a lower one. This may help us find a new method of changing the frequency of the photon. |
| Keywords: | polariton terahertz spectroscopy Raman spectra infrared-visible-UV spectra |
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