Optical tweezers as a micromechanical tool for studying defects in 2D colloidal crystals

Sungcheol Kim; Lichao Yu; Stephanie Huang; Alexandros Pertsinidis; Xinsheng Sean Ling

doi:10.1117/12.897416

9 September 2011 Optical tweezers as a micromechanical tool for studying defects in 2D colloidal crystals

Sungcheol Kim, Lichao Yu, Stephanie Huang, Alexandros Pertsinidis, Xinsheng Sean Ling

Proceedings Volume 8097, Optical Trapping and Optical Micromanipulation VIII; 80970X (2011) https://doi.org/10.1117/12.897416
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

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.

Citation Download Citation

Sungcheol Kim, Lichao Yu, Stephanie Huang, Alexandros Pertsinidis, and Xinsheng Sean Ling "Optical tweezers as a micromechanical tool for studying defects in 2D colloidal crystals", Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 80970X (9 September 2011); https://doi.org/10.1117/12.897416

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