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Development of analytical ultrafast transmission electron microscopy based on laser-driven Schottky field emission
Ultramicroscopy ( IF 2.2 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.ultramic.2019.112887 Chunhui Zhu 1 , Dingguo Zheng 2 , Hong Wang 2 , Ming Zhang 1 , Zhongwen Li 1 , Shuaishuai Sun 1 , Peng Xu 1 , Huanfang Tian 1 , Zian Li 1 , Huaixin Yang 3 , Jianqi Li 4
Ultramicroscopy ( IF 2.2 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.ultramic.2019.112887 Chunhui Zhu 1 , Dingguo Zheng 2 , Hong Wang 2 , Ming Zhang 1 , Zhongwen Li 1 , Shuaishuai Sun 1 , Peng Xu 1 , Huanfang Tian 1 , Zian Li 1 , Huaixin Yang 3 , Jianqi Li 4
Affiliation
A new design scheme for ultrafast transmission electron microscopy (UTEM) has been developed based on a Schottky-type field emission gun (FEG) at the Institute of Physics, Chinese Academy of Sciences (IOP CAS). In this UTEM setup, electron pulse emission is achieved by integrating a laser port between the electron gun and the column and the resulting microscope can operate in either continuous or pulsed mode. In pulsed mode, the optimized electron beam properties are an energy width of ~0.65 eV, micrometer-scale coherence lengths and sub-picosecond pulse durations. The potential applications of this UTEM, which include electron diffraction, high-resolution imaging, electron energy loss spectroscopy, and photon-induced near-field electron microscopy, are demonstrated using ultrafast electron pulses. Furthermore, we use a nanosecond laser (~10 ns) to show that the laser-driven FEG can support high-quality TEM imaging and electron holography when using a stroboscopic configuration. Our results also indicate that FEG-based ultrafast electron sources may enable high-performance analytical UTEM.
更新日期：2020-02-01
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