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Variation of Trapping Strength with Size and Number of Particles in a Single Trap
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作者 Jitendra Bhatt Sachin Bhatt +2 位作者 Shaival Buch ravindra pratap singh Saiyed Nisar Ali Jaaffrey 《Optics and Photonics Journal》 2013年第2期178-183,共6页
Optical tweezers use the radiation pressure to trap and manipulate the microscopic particles. Using various algorithms multiple traps are being formed which can trap a number of particles simultaneously. In contrast t... Optical tweezers use the radiation pressure to trap and manipulate the microscopic particles. Using various algorithms multiple traps are being formed which can trap a number of particles simultaneously. In contrast to multiple traps, many particles can be trapped at a single trap position. It is known that when two or more particles are trapped in a single trap they align themselves in axial direction and it appears as if only one particle is trapped. We present a study of the dependence of the optical trapping force on the number of particles in a single trap using equipartition method;the study was carried out for particles of different sizes. The trapping force was first found to increase then decrease with number of particles in trap for all particle sizes. We feel that our studies will be useful in applications of optical tweezers involving trapping of multiple particles in a single trap. 展开更多
关键词 Optical TWEEZERS Multiple PARTICLES TRAPPING STRENGTH
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Controlling the Flow of Microscopic Particles—The Role of Beam Size
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作者 Jitendra Bhatt Ashok Kumar +1 位作者 Saiyed Nisar Ali Jaaffrey ravindra pratap singh 《Optics and Photonics Journal》 2012年第4期294-299,共6页
Flow of micro particles and fluids is important in many microscopic systems. Here we present details of our finding of a directional flow of micro particles due to a single beam optical trap. It was found that the dir... Flow of micro particles and fluids is important in many microscopic systems. Here we present details of our finding of a directional flow of micro particles due to a single beam optical trap. It was found that the directional flow depends upon the size of optical trap, the number density of particles in the solution and the time after the trap was created. We suggest controlling the motion of microscopic particles in a fluid by varying a simple parameter like beam size for microfluidics applications. 展开更多
关键词 OPTICAL MANIPULATION OPTICAL TWEEZERS Directional FLOW
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