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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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Nonchaotic Nonlinear Motion Visualized in Complex Nanostructures by Stereographic 4D Electron Microscopy

Cited 4 times inthomson ciCited 5 times inthomson ci
Title
Nonchaotic Nonlinear Motion Visualized in Complex Nanostructures by Stereographic 4D Electron Microscopy
Author
Kwon, Oh HoonPark, Hyun SoonBaskin, J. SpencerZewail, Ahmed H.
Issue Date
2010-08
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.10, no.8, pp.3190 - 3198
Abstract
Direct electron imaging with sufficient time resolution is a powerful tool for visualizing the three-dimensional (3D) mechanical motion and resolving the four-dimensional (4D) trajectories of many different components of a nanomachine, e.g., a NEMS device. Here, we report a nanoscale nonchaotic motion of a nano- and microstructured NiTi shape memory alloy in 4D electron microscopy. A huge amplitude oscillatory mechanical motion following laser heating is observed repetitively, likened to a 3D motion of a conductor's baton. By time-resolved 4D stereographic reconstruction of the motion, prominent vibrational frequencies (3.0, 3.8, 6.8, and 14.5 MHz) are fully characterized, showing evidence of nonlinear behavior. Moreover, it is found that a stress (fluence)-strain (displacement) profile shows nonlinear elasticity. The observed resonances of the nanostructure are reminiscent of classical molecular quasi-periodic behavior, but here both the amplitude and frequency of the motion are visualized using ultrafast electron microscopy.
URI
https://scholarworks.unist.ac.kr/handle/201301/8731
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=77955564702
DOI
10.1021/nl102141t
ISSN
1530-6984
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CHM_Journal Papers
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