Abstract
We experimentally demonstrate that optical tweezers can be used to
accelerate the self-assembly of colloidal particles at a water–air interface
in this Letter. The thermal flow induced by optical tweezers dominates the
growth acceleration at the interface. Furthermore, optical tweezers are used
to create a local growth peak at the growing front, which is used to study the
preferential incorporation positions of incoming particles. The results show
that the particles surfed with a strong Marangoni flow tend to fill the gap
and smoothen the steep peaks. When the peak is smooth, the incoming particles
incorporate the crystal homogeneously at the growing front.
© 2017 Chinese Laser Press
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