醇类溶液中的强太赫兹发射

Strong terahertz radiation from alcohol solutions

强太赫兹辐射源的探索对于太赫兹技术的发展起着至关重要的作用。利用醇溶液作为太赫兹激发介质,实验证实了飞秒激光诱导正辛醇溶液液线中的强太赫兹发射。在相同的激光激励条件下,正辛醇溶液中产生的太赫兹辐射约为液态水的3.5倍。研究了正辛醇溶液中的太赫兹发射角,研究表明正辛醇溶液中产生的太赫兹辐射在90°(激光前向)时强度最大,太赫兹辐射发射角度范围介于45°至135°之间。此外,还对醇类进行了量子化学计算,以帮助解释醇溶液中强太赫兹产生的物理机理。计算结果表明醇溶液中产生的太赫兹辐射与其禁带宽度、表面静电势、静态介电常数、MPI极性指数呈负相关关系。

The exploration of strong terahertz radiation sources plays a crucial role in the development of terahertz technology.Femtosecond laser-induced strong terahertz emission in a liquid line of n-octanol solution is experimentally confirmed using an alcohol solution as a terahertz excitation medium.Under the same laser excitation conditions,the terahertz radiation generated in the n-octanol solution is 3.5 times stronger than in liquid water.The terahertz emission angle in n-octanol solution is investigated,and it is shown that the intensity of the terahertz radiation generated in n-octanol solution is maximum at a detection angle of 90°,while the terahertz emission angle ranges from 45°to 135°.In addition,quantum chemical calculations on alcohols are performed to explain the physical mechanism of strong terahertz generation in alcohol solutions.The results show that the terahertz radiation generated in alcohol solutions is negatively correlated with its band gap,surface electrostatic potential,dielectric constant,and MPI polarity index.