Spatiotemporal control of nanooptical excitations
Spatiotemporal control of nanooptical excitations
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DOI：
10.1073/pnas.0913556107
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发表时间：
2010-03-23
影响因子：
11.1
通讯作者：
Voronine, Dmitri V.
中科院分区：
文献类型：
--
作者：
Aeschlimann, Martin;Bauer, Michael;Voronine, Dmitri V.
对光诱导过程的最普遍的研究和利用需要在飞秒时间和纳米长度尺度上同时控制电磁场的空间和时间特性。基于偏振脉冲整形和时间分辨双光子光发射电子显微镜的结合，我们证明了对纳米结构附近电磁激发的纳米级空间和超快时间自由度的控制。局部光电发射率的时间分辨互相关测量揭示了纳米局域光学近场分布的切换，其横向分辨率远低于衍射极限，时间分辨率在飞秒时间尺度上。此外，成功的自适应时空控制证明了该方法的灵活性。这种对纳米光子激发的时间和空间特性的灵活同步控制为光谱方法以及纳米光子应用中的光与物质相互作用的定制和优化提供了新的可能性。
The most general investigation and exploitation of light-induced processes require simultaneous control over spatial and temporal properties of the electromagnetic field on a femtosecond time and nanometer length scale. Based on the combination of polarization pulse shaping and time-resolved two-photon photoemission electron microscopy, we demonstrate such control over nanoscale spatial and ultrafast temporal degrees of freedom of an electromagnetic excitation in the vicinity of a nanostructure. The time-resolved cross-correlation measurement of the local photoemission yield reveals the switching of the nanolocalized optical near-field distribution with a lateral resolution well below the diffraction limit and a temporal resolution on the femtosecond time scale. In addition, successful adaptive spatiotemporal control demonstrates the flexibility of the method. This flexible simultaneous control of temporal and spatial properties of nanophotonic excitations opens new possibilities to tailor and optimize the light-matter interaction in spectroscopic methods as well as in nanophotonic applications.