| 水溶性CdTe:Mn量子点的双光子吸收 |
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| 引用本文： | 刘丽炜,李钰,胡思怡,陶海岩,陈桂波,谭欣,张喜和.水溶性CdTe:Mn量子点的双光子吸收[J].强激光与粒子束,2013,25(2):350-354. |
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| 作者姓名： | 刘丽炜 李钰 胡思怡 陶海岩 陈桂波 谭欣 张喜和 |
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| 作者单位： | 1.长春理工大学 理学院, 长春 1 30022 |
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| 基金项目： | 国家自然科学基金项目(41004042); 吉林省科技厅项目(20110748) |
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| 摘 要： | 采用激发波长800 nm、脉宽50 fs、重复频率1 kHz的Ti:sapphire放大飞秒激光器作为激发光源，利用开孔Z扫描技术研究了不同粒径的CdTe:Mn量子点的非线性吸收性质。理论计算结果表明，同一生长时间CdTe:Mn量子点的双光子吸收系数是CdTe量子点的1.1倍，其双光子吸收系数随量子点尺寸的减小而增大，这是由于CdTe:Mn量子点非线性吸收属于反饱和吸收，掺杂了Mn元素，减小了表面缺陷浓度，表明掺杂量子点具有很好的双光子吸收现象。
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| 关 键 词： | 量子点 Z扫描 双光子吸收 吸收光谱 量子尺寸 |
| 收稿时间： | 2012/4/10 |
Two photon absorption of CdTe:Mn quantum dots in aqueous solution |
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| Liu Liwei,Li Yu,Hu Siyi,Tao Haiyan,Chen Guibo,Tan Xin,Zhang Xihe.Two photon absorption of CdTe:Mn quantum dots in aqueous solution[J].High Power Laser and Particle Beams,2013,25(2):350-354. |
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| Authors: | Liu Liwei Li Yu Hu Siyi Tao Haiyan Chen Guibo Tan Xin Zhang Xihe |
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| Affiliation: | 1.School of Science,Changchun University of Science and Technology,Changchun 130022,China |
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| Abstract: | The two photon absorption of water soluble CdTe quantum dots and Mn2+ doped CdTe quantum dots in four different sizes has been studied, by using the open Z scan technique, with a Ti: sapphire laser at 800 nm wavelength, 50 fs pulsewidth, 1 kHz repetition frequency. The results show that, the two photon absorption coefficient of CdTe: Mn quantum dots is 11 times that of CdTe quantum dots for the same growth time, and the relationship between the two photon absorption coefficient of quantum dots and the particle size is inverse proportion, because the nonlinear absorption of CdTe: Mn quantum dots belongs to the saturated absorption. It is shown that Mn2+ doped quantum dots exhibit good two photon absorption phenomenon, and have broad application prospects in optical switches and optical limiting devices. |
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| Keywords: | quantum dots Z scan two photon absorption absorption spectrum quantum size |
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