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Research on the Characteristic of the Force Exerted on A Particle in the Optical Vortex

Author: WangQiang
Tutor: XuJianBo
School: Shandong Normal University
Course: Optics
Keywords: Axial force Optical tweezers Optical vortex Higher order Bessel beams
CLC: O439
Type: Master's thesis
Year: 2010
Downloads: 95
Quote: 0
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Abstract


Has been widely used in the fields of biology and medicine , optical tweezers , optical tweezers can manipulate the particles of a few tens of nanometers to tens of microns , becoming a powerful tool life technology and micro- manipulation research areas as optical tweezers technology continues to evolve , but has great limitations of traditional optical tweezers . For example , can only capture a high - refractive-index particles , can not capture the low refractive index particles , the damage due to the heat absorption by the particles in the beam focusing region . Optical vortex can overcome the above difficulties , not only can capture particles in high- focus area can also capture the low refractive index particles . This paper studies the force of the particles in the higher order Bessel beam , according to the expression of the light field force expressions derived particles . And discussed the relationship between the light wavelength , the particle radius , the beam waist radius , the refractive index and the axial force to the particles are stable binding conditions are discussed and in accordance with the analog image . The results show that : the smaller the beam's wavelength , the greater the axial force , the better the stability of the trapped particles ; greater the refractive index of the particle itself , the deeper the potential well , the easier to capture particles ; waist radius of the axial force greater impact , larger waist radius larger axial force quickly ; beam wavelength , particle refractive index , particle radius , beam waist radius of the axial force , therefore choosing the experimental parameters stable trapped particles . Further explained by higher order Bessel beam with zero-order Bessel beam force Optical vortex field more stable bound particles . The text is divided into five parts : The first chapter describes the optical tweezers technology research history , background , and domestic and foreign research status . The second chapter describes the basic principles outlined . Chapter force analysis of particles in a Gaussian beam . Chapter particles in Optical vortex field beam stress analysis . The fifth chapter is the research progress of optical vortex angular momentum and the optical vortex

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CLC: > Mathematical sciences and chemical > Physics > Optics > Applied Optics
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