飞秒激光诱导液线辐射太赫兹波的介质特性研究

Study of dielectric characteristics of Terahertz waves radiated by femtosecond laser induced liquid lines

为了进一步优化基于飞秒激光诱导的液态太赫兹辐射源,设计一种飞秒激光诱导液线辐射太赫兹波的实验系统,结合量子化学计算和飞秒激光诱导液线辐射太赫兹波实验,研究了激发介质的微观特性和宏观特性与太赫兹电场的关系。实验与计算结果表明:太赫兹电场与禁带宽度、偶极矩均呈负相关;太赫兹电场随溶液浓度变化的非线性趋势与介质的密度、雷诺数有关,太赫兹波电场的最佳体积分数为40%。

In order to further optimize the liquid Terahertz radiation source induced by femtosecond laser,a femtosecond laser-induced liquid line radiation Terahertz wave experimental system was designed.Combined with quantum chemistry calculation and femtosecond laser-induced liquid line radiation Terahertz wave experiment,the relationship between the microscopic and macroscopic characteristics of the excited medium and the Terahertz electric field was studied.The experimental and calculated results show that the Terahertz electric field is negatively correlated with band gap width and dipole moment.The nonlinear trend of Terahertz electric field with solution concentration is related to the density and Reynolds number of the medium,and the optimal volume fraction of Terahertz wave electric field is 40%.