Broadband ultrafast spatial self-phase modulation for topological insulator Bi2Te3 dispersions
Broadband ultrafast spatial self-phase modulation for topological insulator Bi2Te3 dispersions
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拓扑绝缘体 Bi2Te3 色散的宽带超快空间自相位调制
DOI：
10.1063/1.4932590
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发表时间：
2015-10-12
影响因子：
4
通讯作者：
Wen, Shuangchun
中科院分区：
文献类型：
--
作者：
Shi, Bingxin;Miao, Lili;Wen, Shuangchun
采用低成本的溶剂热法合成了具有均匀六方结构的超薄拓扑绝缘体碲化铋（Bi 2 Te 3）纳米片。用400 nm、800 nm和1070 nm的超快激光观察了这些拓扑绝缘体纳米片的宽带空间自相位调制现象。实验结果表明，这种相干光散射是由于宽带，超快，和大的三阶光学非线性Bi 2 Te 3。在脉冲激光激发下，测得Bi 2 Te 3色散溶液的非线性折射率（n2）为10 - 12 m2/W，三阶非线性极化率为10 - 7 esu。我们的工作为进一步开发基于拓扑绝缘体的非线性光学应用提供了一个途径。
Ultrathin topological insulator bismuth telluride (Bi2Te3) nanosheets with uniform hexagonal nanostructure have been synthesized by cost-effective solvothermal method. Broadband spatial self-phase modulation phenomena of these topological insulator nanosheets have been observed with 400 nm, 800 nm, and 1070 nm ultrafast lasers. The experimental results suggest that this coherent light scattering is due to the broadband, ultrafast, and large third-order optical nonlinearity of Bi2Te3. With the pulsed laser excitation, the nonlinear refractive index (n2) of Bi2Te3 dispersion solution was measured to be ∼10−12 m2/W, and the third-order nonlinear susceptibility ∼10−7 esu. Our work may provide an inroad for developing the nonlinear optical applications based on topological insulators.