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Proceedings Paper

Optical tweezers as a micromechanical tool for studying defects in 2D colloidal crystals
Author(s): Sungcheol Kim; Lichao Yu; Stephanie Huang; Alexandros Pertsinidis; Xinsheng Sean Ling
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Paper Abstract

This paper reports on some new results from the analyses of the video microscopy data obtained in a prior experiment on two-dimensional (2D) colloidal crystals. It was reported previously that optical tweezers can be used to create mono- and di-vacancies in a 2D colloidal crystal. Here we report the results on the creation of a vacancyinterstitial pair, as well as tri-vacancies. It is found the vacancy-interstitial pair can be long-lived, but they do annihilate each other. The behavior of tri-vacancies is most intriguing, as it fluctuates between a configuration of bound pairs of dislocations and that of a locally amorphous state. The relevance of this observation to the issue of the nature of 2D melting is discussed.

Paper Details

Date Published: 9 September 2011
PDF: 6 pages
Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 80970X (9 September 2011); doi: 10.1117/12.897416
Show Author Affiliations
Sungcheol Kim, Brown Univ. (United States)
Lichao Yu, Brown Univ. (United States)
Stephanie Huang, Brown Univ. (United States)
Alexandros Pertsinidis, Brown Univ. (United States)
Xinsheng Sean Ling, Brown Univ. (United States)

Published in SPIE Proceedings Vol. 8097:
Optical Trapping and Optical Micromanipulation VIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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