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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


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

DC Field Value Language Kwon, Oh Hoon ko Park, Hyun Soon ko Baskin, J. Spencer ko Zewail, Ahmed H. ko 2014-11-14T00:18:15Z - 2014-11-12 ko 2010-08 ko
dc.identifier.citation NANO LETTERS, v.10, no.8, pp.3190 - 3198 ko
dc.identifier.issn 1530-6984 ko
dc.identifier.uri -
dc.description.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. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Nonchaotic Nonlinear Motion Visualized in Complex Nanostructures by Stereographic 4D Electron Microscopy ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-77955564702 ko
dc.identifier.wosid 000280728900077 ko
dc.type.rims ART ko
dc.description.wostc 4 *
dc.description.scopustc 5 * 2015-05-06 * 2014-11-12 *
dc.identifier.doi 10.1021/nl102141t ko
dc.identifier.url ko
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