| 纳秒激光作用下二氧化钒薄膜相变特性 |
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| 引用本文： | 李宏哲,盛传祥,厉申博,顾国华,任侃,陈钱,何伟基,袁国亮.纳秒激光作用下二氧化钒薄膜相变特性[J].强激光与粒子束,2015,27(5):059001. |
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| 作者姓名： | 李宏哲 盛传祥 厉申博 顾国华 任侃 陈钱 何伟基 袁国亮 |
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| 作者单位： | 1.南京理工大学 江苏省光谱成像与智能感知重点实验室, 南京 21 0094; |
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| 摘 要： | 采用脉冲激光沉积法制备了VO2薄膜,应用X射线衍射和X射线光电子能谱分析表明样品为多晶薄膜。采用泵浦-探针方法研究了二氧化钒薄膜的相变特性,实验结果表明当激光重复频率为160 Hz时,样品最小相变响应为12ns,相变恢复时间与激光能量按照自然指数关系变化。仿真结果表明当激光能量一定时,二氧化钒薄膜相变恢复时间与衬底材料的热导率、热扩散系数有关。
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| 关 键 词： | 二氧化钒 脉冲激光沉积 光开关 相变响应 |
| 收稿时间： | 2014-07-24 |
Phase transition properties of vanadium oxide thin films irradiated by nanosecond laser |
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| Affiliation: | 1.Jiangsu Key Laboratory of Spectral Imaging &Intelligence Sense,Nanjing University of Science and Technology,Nanjing 210094,China;2.School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China |
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| Abstract: | Vanadium oxide (VO2) thin films were successfully deposited using pulsed laser deposition (PLD) method. The samples were identified as polycrystalline thin films by analysis of X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) . Phase transition properties of VO2 films irradiated by nanosecond laser were investigated by pump-probe technique. The results show that the minimum response time is 12 ns at repetition rate of 160 Hz. Moreover, the recovery time of phase transition varies with laser energy according to natural exponential law. Our simulation results suggest that the recovery time of phase transition correlates with thermal conductivity and thermal diffusion coefficient of substrates for the same laser energy. |
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