Time-resolved structural dynamics of thin metal films heated with femtosecond optical pulses
Time-resolved structural dynamics of thin metal films heated with femtosecond optical pulses
复制标题
用飞秒光脉冲加热的金属薄膜的时间分辨结构动力学
DOI：
10.1073/pnas.1115237108
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发表时间：
2011-11-22
影响因子：
11.1
通讯作者：
Rentzepis, Peter M.
中科院分区：
文献类型：
--
作者：
Chen, Jie;Chen, Wei-Kan;Rentzepis, Peter M.
我们利用100 fs光脉冲诱导35 ~ 150 nm厚的Au（111）单晶的超快失序，并利用0.6 ps， 8.04 kev的x射线脉冲观察随后的结构演变。监测x射线衍射强度、宽度和位移的皮秒时间依赖性调制，我们直接测量了电子/声子耦合、声子/晶格相互作用和晶格无序演化的直方图，例如由于压力波以声速传播而导致的晶格呼吸、晶格熔化和再结晶，包括马赛克形成。理论模拟的结果与晶格/液相转变过程的实验数据一致，并与实验结果相吻合。这些时间分辨的x射线衍射数据提供了超快激光脉冲撞击薄金属单晶所引起的所有重要过程的详细描述。
We utilize 100 fs optical pulses to induce ultrafast disorder of 35- to 150-nm thick single Au(111) crystals and observe the subsequent structural evolution using 0.6-ps, 8.04-keV X-ray pulses. Monitoring the picosecond time-dependent modulation of the X-ray diffraction intensity, width, and shift, we have measured directly electron/phonon coupling, phonon/lattice interaction, and a histogram of the lattice disorder evolution, such as lattice breath due to a pressure wave propagating at sonic velocity, lattice melting, and recrystallization, including mosaic formation. Results of theoretical simulations agree and support the experimental data of the lattice/liquid phase transition process. These time-resolved X-ray diffraction data provide a detailed description of all the significant processes induced by ultrafast laser pulses impinging on thin metallic single crystals.