Abstract
Optical tweezers are the craft of manipulating objects with light. Since its invention in 1970, this technique has become a powerful tool in scientific areas such as biology, physical chemistry and soft matter physics. Nonetheless, optical trapping of objects at the nanoscale range is still challenging. During the past decade, with the increasing interest in structured light with spatially inhomogeneous state of polarizations and optical singularities, numerous optical beams have been proposed to manipulate, sort, and separate various nanoparticles in stable and flexible ways. In this review, starting from basic theories and computational approaches, we highlight the latest techniques of optically manipulating nanoparticles using structured light, which might lead to future advancements in the field.
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