FRAME: femtosecond videography for atomic and molecular dynamics.
FRAME: femtosecond videography for atomic and molecular dynamics.
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DOI：
10.1038/lsa.2017.45
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发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Kristensson E
中科院分区：
文献类型：
--
作者：
Ehn A;Bood J;Li Z;Berrocal E;Aldén M;Kristensson E
物理、化学和生物学中的许多重要科学问题需要有效的方法来光谱探测超快的原子内和原子间/分子动力学。然而，目前延伸到飞秒范围的方法只能进行点测量或单次快照可视化，因此无法对动态单次事件进行超快光谱摄像。在这里，我们提出了一种基于激光探测器的方法，该方法能够在超快时间尺度(飞秒或更短的时间)下对单个、非重复事件进行二维摄像。该方法基于将结构代码叠加到照明上以加密单个事件，然后在后处理步骤中解密该单个事件。这种编码策略使具有任意波长/带宽的激光探测能够收集带有不分青红皂白的光谱信息的信号，从而允许具有完全光谱能力的超高速视频成像。为了证明我们方法的高时间分辨率，我们展示了具有创纪录的200飞秒时间分辨率的光传播的视频。该方法广泛适用于研究物理、化学和生物中的多种动力学过程。由于最小帧间隔(时间分辨率)仅由激光脉冲持续时间决定，阿秒激光技术可能会将视频速率进一步提高几个数量级。
Many important scientific questions in physics, chemistry and biology require effective methodologies to spectroscopically probe ultrafast intra- and inter-atomic/molecular dynamics. However, current methods that extend into the femtosecond regime are capable of only point measurements or single-snapshot visualizations and thus lack the capability to perform ultrafast spectroscopic videography of dynamic single events. Here we present a laser-probe-based method that enables two-dimensional videography at ultrafast timescales (femtosecond and shorter) of single, non-repetitive events. The method is based on superimposing a structural code onto the illumination to encrypt a single event, which is then deciphered in a post-processing step. This coding strategy enables laser probing with arbitrary wavelengths/bandwidths to collect signals with indiscriminate spectral information, thus allowing for ultrafast videography with full spectroscopic capability. To demonstrate the high temporal resolution of our method, we present videography of light propagation with record high 200 femtosecond temporal resolution. The method is widely applicable for studying a multitude of dynamical processes in physics, chemistry and biology over a wide range of time scales. Because the minimum frame separation (temporal resolution) is dictated by only the laser pulse duration, attosecond-laser technology may further increase video rates by several orders of magnitude.
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