Optical Potential-Well Array for High-Selectivity, Massive Trapping and Sorting at Nanoscale.
2020
Optical
tweezers are versatile tools capable of sorting microparticles,
yet formidable challenges are present in the separation of nanoparticles
smaller than 200 nm. The difficulties arise from the controversy on
the requirement of a tightly focused light spot in order to create
strong optical forces while a large area is kept for the sorting.
To overcome this problem, we create a near-field potential well array
with connected tiny hotspots in a large scale. This situation can
sort nanoparticles with sizes from 100 to 500 nm, based on the differentiated
energy depths of each potential well. In this way, nanoparticles of
200, 300, and 500 nm can be selectively trapped in this microchannel
by appropriately tuning the laser power. Our approach provides a robust
and unprecedented recipe for optical trapping and separation of nanoparticles
and biomolecules, such that it presents a huge potential in the physical
and biomedical sciences.
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