Coherent Two-Dimensional Nanoscopy
Coherent Two-Dimensional Nanoscopy
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DOI：
10.1126/science.1209206
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发表时间：
2011-09-23
期刊：
影响因子：
56.9
通讯作者：
Voronine, Dmitri V.
中科院分区：
文献类型：
--
作者：
Aeschlimann, Martin;Brixner, Tobias;Voronine, Dmitri V.
我们介绍了一种光谱方法，确定超出光学衍射极限的非线性量子力学响应函数，并允许直接成像的纳米级的相干性。在已建立的相干二维（2D）光谱，四波混频响应测量使用三个入射波和一个出射波，因此，该方法是衍射有限的空间分辨率。在相干2D纳米显微镜中，我们使用四个入射波，并通过具有50纳米空间分辨率的光发射电子显微镜检测最终状态。我们记录了当地的纳米光谱从波纹银表面，并观察到亚波长的二维线形变化。局部激发的等离子体相位相干性持续约100飞秒，并表现出连贯的节拍。观测结果最好解释的模型中，耦合振荡器导致Fano样的共振在杂交暗和亮模式响应。
We introduce a spectroscopic method that determines nonlinear quantum mechanical response functions beyond the optical diffraction limit and allows direct imaging of nanoscale coherence. In established coherent two-dimensional (2D) spectroscopy, four-wave-mixing responses are measured using three ingoing waves and one outgoing wave; thus, the method is diffraction-limited in spatial resolution. In coherent 2D nanoscopy, we use four ingoing waves and detect the final state via photoemission electron microscopy, which has 50-nanometer spatial resolution. We recorded local nanospectra from a corrugated silver surface and observed subwavelength 2D line shape variations. Plasmonic phase coherence of localized excitations persisted for about 100 femtoseconds and exhibited coherent beats. The observations are best explained by a model in which coupled oscillators lead to Fano-like resonances in the hybridized dark-and bright-mode response.