摘要
用涡旋光束形成的光镊,利用其形成的光陷阱将分子物质困于光束中心附近,可以"夹取"分子物质,在医学和生物物理方面有重要的应用。将探讨涡旋光束的矢量衍射机制,在瑞利散射条件下与物质的相互作用,使用矢量衍射而非近轴近似的方法模拟矢量衍射,得到了更为精确的衍射图样;同时基于Y Harada和T Asakura的工作,在瑞利散射条件下使用数值模拟方法,模拟分子粒子所受的力,来解释光镊的原理和涡旋光束的一些性质,得到的结果与近轴近似不同,所采用的矢量衍射可以更好的模拟光束的衍射现象。
Optical vortex beams used as＂optical tweezers＂forms an optical trap which is able to trap molecule into the central region of the beam. This technique is useful in medical engineering and biophysics researches. This article discusses the mechanism of optical vortex beams and their interaction with molecules under Rayleigh scattering regime. Vector diffraction of the beams by lens are simulated numerically,more accurate diffraction patterns are attained. Also based on the work of Y Harada and T Asakura,numerical methods are applied under Rayleigh regime to simulate the force exerted on the particle to explain the properties of optical tweezers and optical vortex beams. Different from paraxial approximation,vector diffraction theory could better explain diffraction phenomenon.
出处
《江西科学》
2017年第5期671-675,共5页
Jiangxi Science
关键词
光镊
矢量衍射
瑞利散射条件
涡旋光束
optical tweezers
vector diffraction
rayleigh regime
optical vortex beams
作者简介
张冠鸣（192-）,男,硕士,研究方向：光镊中的散射现象,光镊及其应用.
