Dąbrowski Maciej, Dai Yanan, Petek Hrvoje
Department of Physics and Astronomy and Pittsburgh Quantum Institute, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.
J Phys Chem Lett. 2017 Sep 21;8(18):4446-4455. doi: 10.1021/acs.jpclett.7b00904. Epub 2017 Sep 6.
Experimental methods for ultrafast microscopy are advancing rapidly. Promising methods combine ultrafast laser excitation with electron-based imaging or rely on super-resolution optical techniques to enable probing of matter on the nano-femto scale. Among several actively developed methods, ultrafast time-resolved photoemission electron microscopy provides several advantages, among which the foremost are that time resolution is limited only by the laser source and it is immediately capable of probing of coherent phenomena in solid-state materials and surfaces. Here we present recent progress in interference imaging of plasmonic phenomena in metal nanostructures enabled by combining a broadly tunable femtosecond laser excitation source with a low-energy electron microscope.
超快显微镜的实验方法正在迅速发展。有前景的方法将超快激光激发与基于电子的成像相结合，或者依靠超分辨率光学技术来实现对纳秒至飞秒尺度物质的探测。在几种正在积极研发的方法中，超快时间分辨光发射电子显微镜具有诸多优势，其中最主要的是时间分辨率仅受激光源限制，并且它能够立即探测固态材料和表面的相干现象。在此，我们展示了通过将宽可调谐飞秒激光激发源与低能电子显微镜相结合，在金属纳米结构中等离激元现象的干涉成像方面取得的最新进展。
