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MOSI纳米线的非平衡光学特性Non-equilibrium optical properties of MoSI nanowires |
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| 课程网址: | http://videolectures.net/slonano07_gagermaier_nop/ |
| 主讲教师: | Christoph Gadermaier |
| 开课单位: | 约瑟夫·斯特凡学院 |
| 开课时间: | 2008-02-12 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | MoSI nanowires are the one-dimensional systems with the weakest known interaction with their neighbours. Therefore they are expected to show most clearly the effects of one-dimensionality. We studied equilibrium and non-equilibrium optical properties via optical reflectivity and absorbance as well as femtosecond pump-probe spectra of oriented Mo6S3I6 nanowire thin films. Absorption of light polarised parallel to the axis of orientation shows a series of resonances that are absent for perpendicular polarisation. The sharp Van Hove features expected from the highly one-dimensional character of the material are not observed, partly because of the large density of electron sub-bands and partly because of electron energy damping. The electronic relaxation from a non-equilibrium situation was studied via femtosecond pump-probe spectroscopy. By exciting into the second optical resonance we found a complex relaxation behaviour involving three distinct excited states and determined the lifetimes of the involved states. |
| 关 键 词: | 莫思纳米线; 第二光学谐振; 光学反射率 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-07-29：yumf |
| 阅读次数: | 66 |