Statics and dynamics of colloidal particles on optical trap arrays

C. Reichhardt; C. J. Olson Reichhardt

doi:10.1117/12.824902

20 August 2009 Statics and dynamics of colloidal particles on optical trap arrays

Proceedings Volume 7400, Optical Trapping and Optical Micromanipulation VI; 74000J (2009) https://doi.org/10.1117/12.824902
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

We examine the statics and dynamics of charged colloids interacting with periodic optical trap arrays. In particular we study the regime where more than one colloid is confined in each trap, creating effective dimer, trimer, and higher order states called colloidal molecular crystals. The n-mer states have an effective orientational degree of freedom which can be controlled with an external driving field. In general, the external field causes a polarization effect where the orientation of the n-mers aligns with the external field, similar to liquid crystal systems. Additionally, under a rotating external drive the n-mers can rotate with the drive. In some cases a series of structural transitions in the colloidal crystal states occur in the rotating field due to a competition between the ordering of the colloidal molecular crystals and the polarization effect which orients the n-mers in the direction of the drive. We also show that for some parameters, the n-mers continuously rotate with the drive without switching, that depinning transitions can occur where the colloids jump from well to well, and that there are a number of distinct dynamical transitions between the phases. Finally, we illustrate colloidal orderings at fillings of more than four colloids per trap, indicating that it is possible to create higher order colloidal crystal cluster phases.

Citation Download Citation

C. Reichhardt and C. J. Olson Reichhardt "Statics and dynamics of colloidal particles on optical trap arrays", Proc. SPIE 7400, Optical Trapping and Optical Micromanipulation VI, 74000J (20 August 2009); https://doi.org/10.1117/12.824902

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