Large Submillimeter Assembly of Microparticles with
Necklace-like Patterns Formed by Laser Trapping at Solution Surface
Posted on 2020-07-15 - 20:29
In
colloidal solution, nanoparticles can be optically trapped by
a tightly focused laser beam, and they are assembled in a focal spot
whose diameter is typically about one micrometer. We herein report
that a large submillimeter sized assembly of polystyrene microparticles
with necklace-like patterns are prepared by laser trapping at a solution
surface. The light propagation outside the focal spot is directly
confirmed by 1064 nm backscattering images, and finite difference
time domain simulation well supports the idea that an optical potential
is expanded outside the focal spot based on light propagation through
whispering gallery mode. This demonstration opens a new method for
fabrication of a millimeter-order huge assembly by a single tightly
focused laser beam.
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Lu, Jia-Syun; Wang, Hsuan-Yin; Kudo, Tetsuhiro; Masuhara, Hiroshi (2020). Large Submillimeter Assembly of Microparticles with
Necklace-like Patterns Formed by Laser Trapping at Solution Surface. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.0c01602