Manipulation of Microobjects by Optical Tweezers
Radiation pressure from a tightly focused laser beam can be used as optical tweezers to confine, position, and transport microparticles. Ashkin’s group first demonstrated this technique in 1986 . Optical tweezers provide unique features such as remote manipulation of micro/nano particles in unique features such as remote manipulation of micro/nano particles in liquid, noninvasive manipulation of biological samples, precise manipulation in sealed environment, and extremely small torque of the order of 10-12 Nm. For these reasons, optical tweezers and its related techniques have been widely applied to studies on biological cells and DNA molecules, microchemistry with microdroplets and beads. The history and previous works on optical tweezers were introduced in some review reports [2-5].
Although optical tweezers using a single focused laser beam have already used in many applications in various research fields, advanced technologies using optical trapping have increasingly developed such as multiple trapping based on holographic methods and special laser beams including Laguerre Gaussian beam and Bessel beam . The advanced methods play an important role to expand the ability for the manipulation of microparticles.
KeywordsLaser Beam Radiation Pressure Optical Tweezer Spatial Light Modulator Optical Trap
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