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첨단연성물질 연구단
첨단연성물질 연구단
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Ultrafast Electron Microscopy Visualizes Acoustic Vibrations of Plasmonic Nanorods at the Interfaces

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Title
Ultrafast Electron Microscopy Visualizes Acoustic Vibrations of Plasmonic Nanorods at the Interfaces
Author(s)
Ye-Jin Kim; Hayoon Jung; Sang Woo Han; Oh-Hoon Kown
Publication Date
2019-08
Journal
Matter, v.1, no.2, pp.481 - 495
Publisher
Esvier
Abstract
© 2019 Elsevier Inc.By integrating a direct electron detector with ultrafast electron microscopy and controlling the quality of the pulsed electron beam, unprecedented spatiotemporal resolution in real-space imaging was achieved under practical pump-probe measurements. As a proof-of-principle demonstration of this new technique, the acoustic vibrations of plasmonic nanorods that were one nanometer amplitude or less and picosecond period upon femtosecond-pulsed photoexcitation were studied at the frictional interfaces. The subnanometer sensitivity in visualizing individual mechanical movement captures new details about acoustic vibrations such as the initial launching of the vibrations and the suppression and release of the vibration at the interfaces. Since the achievement of atomic spatial resolution in imaging materials, prolonged efforts have been devoted to capture the dynamics therein. Whereas conventional microscopy is conducted in a time-integrated manner limited by the camera frame rate, introducing pulsed electrons to microscopy provides unique timing control liberated by the intrinsic timescale of the displacement of atoms. In this work, with the aid of a highly sensitive camera, the spatial resolution of an ultrafast electron microscope was improved by an order of magnitude, imaging acoustic vibration of individual nanorods with the sensitivity of several angstroms. We are now one more step closer to filming atomic motions. Once realized, the time-resolved imaging with truly atomic spatiotemporal resolution would also yield a wealth of quantitative knowledge pertaining to structure, dynamics, and function in highly correlated systems. Combination of a direct electron detector with ultrafast electron microscopy enabled direct visualization of acoustic vibration of a single plasmonic nanostructure at high spatiotemporal limit, resolving the time-dependent Å-scale displacement to a few-picosecond precision. This made possible the proposal that the launching of the acoustic vibration is related to the activation energy, associated with the (in)commensurability of two crystalline lattice planes at the interface
URI
https://pr.ibs.re.kr/handle/8788114/7070
ISSN
2590-2393
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
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