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We develop a new type of optical tweezers that exploits thermophoresis and solid-state optical refrigeration to trap and manipulate nanoparticles at the laser-generated cold region. Localized optical refrigeration of a solid substrate creates a temperature gradient field to trap nanoparticles and molecules with common thermophobic nature at the laser beam center by thermophoresis. The trapping of objects at the low-temperature region can effectively avoid photothermal degradation. In addition, compared to conventional optical tweezers, our tweezers require a weakly focused laser beam with a lower optical intensity to trap fragile objects, which can reduce the photodamages.
Jingang Li andYuebing Zheng
"Trapping nanoparticles with optical refrigeration", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 117981W (1 August 2021); https://doi.org/10.1117/12.2595047
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