相位调制双曲余弦高斯光束的梯度力  

The evolution of the gradient force pattern of hyperbolic-cosine-Gaussian beams induced by a pure phase plate

作　　者：李劲松[1] 李晨霞[1] 高秀敏[2] 

机构地区：[1]中国计量学院光学与电子科技学院,杭州310018 [2]杭州电子科技大学电子信息分院,杭州310018

出　　处：《激光杂志》2008年第6期57-58,共2页Laser Journal

基　　金：国家自然科学基金(项目号:60708002);浙江省科技厅项目(项目号:2007F70018)资助

摘　　要：分析了同心分区相位板对双曲余弦高斯光束的梯度力的调制效应。模拟结果表明相位板可以调节焦点区域梯度力的分布,通过改变相位板的各个区域半径的大小,可以改变梯度力的分布形式,同时会出现多个光陷阱,光陷阱的形状也会发生非常明显的变化,改变相位板的相位变换量,可以使光陷阱移动,相位变换量从π增大到2π的过程中,其梯度力的演化形态和光陷阱的移动方向与相位变换量从0增加到π的过程中梯度力的演化形态和光陷阱的移动方向相反,这种相位板可用于构建可控光镊。The evolution of the gradient force pattern of hyperbolic - cosine - Ganssian beams induced by a pure phase plate is numerically investigated. The pnne phase plate consists of three concentric zones： center circle zone, inner annular zone and outer annular zone. And the phase variance of inner annular zone is adjustable. The results show that the proposed plate may induce tunable gradient force on the particles in focal region. The optical trap shape is ttmable obviously with changing geometrical parameters of the phase plate. Optical trap shift may be induced by changing the phase variance of the inner annular zone portion. The phase plate can be used to construct controllable optical tweezers.

关 键 词：双曲余弦高斯光束 相位板 梯度力. 

分 类 号：Q631[生物学—生物物理学]