强激光与粒子束, 2013, 25 (2): 350, 网络出版: 2013-01-07  

水溶性CdTe:Mn量子点的双光子吸收

Twophoton absorption of CdTe:Mn quantum dots in aqueous solution
作者单位
长春理工大学 理学院, 长春 130022
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。
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 11 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.

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. 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.

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