Development of in situ optical spectroscopy with high temporal resolution in an aberration-corrected transmission electron microscope
| العنوان: | Development of in situ optical spectroscopy with high temporal resolution in an aberration-corrected transmission electron microscope |
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| المؤلفون: | Peng Gao, Xuedong Bai, Zhi Xu, Huacong Sun, Xiaomin Li, Chang Liu, Kaihui Liu, Enge Wang, Chaojie Ma, Ruixi Qiao, J. C. Xu |
| المصدر: | Review of Scientific Instruments. 92:013704 |
| بيانات النشر: | AIP Publishing, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | 010302 applied physics, Materials science, business.industry, 01 natural sciences, 010305 fluids & plasmas, Optics, Transmission electron microscopy, Quantum dot, Temporal resolution, 0103 physical sciences, Dispersion (optics), business, Spectroscopy, Instrumentation, Image resolution, Ultrashort pulse, Diffraction grating |
| الوصف: | Exploring the corresponding relation between structural and physical properties of materials at the atomic scale remains the fundamental problem in science. With the development of the aberration-corrected transmission electron microscopy (AC-TEM) and the ultrafast optical spectroscopy technique, sub-angstrom-scale spatial resolution and femtosecond-scale temporal resolution can be achieved, respectively. However, the attempt to combine both their advantages is still a great challenge. Here, we develop in situ optical spectroscopy with high temporal resolution in AC-TEM by utilizing a self-designed and manufactured TEM specimen holder, which has the capacity of sub-angstrom-scale spatial resolution and femtosecond-scale temporal resolution. The key and unique design of our apparatus is the use of the fiber bundle, which enables the delivery of focused pulse beams into TEM and collection of optical response simultaneously. The generated focused spot has a size less than 2 µm and can be scanned in plane with an area larger than 75 × 75 µm2. Most importantly, the positive group-velocity dispersion caused by glass fiber is compensated by a pair of diffraction gratings, thus resulting in the generation of pulse beams with a pulse width of about 300 fs (@ 3 mW) in TEM. The in situ experiment, observing the atomic structure of CdSe/ZnS quantum dots in AC-TEM and obtaining the photoluminescence lifetime (∼4.3 ns) in the meantime, has been realized. Further ultrafast optical spectroscopy with femtosecond-scale temporal resolution could be performed in TEM by utilizing this apparatus. |
| تدمد: | 1089-7623 0034-6748 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fd66476525ff68ac678dba428d861b2 https://doi.org/10.1063/5.0031115 |
| رقم الأكسشن: | edsair.doi.dedup.....1fd66476525ff68ac678dba428d861b2 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Scitation. | تدمد: | 10897623 00346748 |
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