不同偏振态光镊三维光阱刚度的比较研究
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摘要
为了研究激光偏振态对光阱刚度的影响,本文比较了四种不同偏振态光场(方位角偏振光、径向偏振光、线偏振光、圆偏振光)捕获不同尺寸SiO_2微粒的三维光阱刚度.研究结果表明:当SiO_2微粒的尺寸和激光波长相近时,圆偏振光和线偏振光的三维光阱刚度大于径向偏振光和方位角偏振光的三维光阱刚度;而随着SiO_2微粒尺寸的增加,方位角偏振光和径向偏振光的三维光阱刚度大于圆偏振光和线偏振光的三维光阱刚度.此外,实验也表明:使用浸油物镜捕获微粒时,物镜匹配油的折射率和水的折射率不一致引起的球差,会降低系统对物镜数值孔径的利用.通过这些研究工作,可以为不同偏振态光场的测力研究提供一定的指导和参考.
To elucidate the influence of laser polarization state on optical trap stiffness,the threedimensional stiffness of four kinds of optical traps with different polarization states(azimuthally polarized beam,radially polarized beam,linearly polarized beam,and circularly polarized beam)to trap silica beads with different sizes was investigated.The result show that,when the silica bead's size is equivalent to the laser wavelength,the three-dimensional stiffness of circularly polarized beam and linearly polarized beam are larger than those of radially polarized beam and azimuthally polarized beam.With the increase of the silica bead's size,the three-dimensional stiffness of azimuthally polarized beam and radially polarized beam are larger than those of circularly polarized beam and linearly polarized beam.In addition,the experimental results also show that,when using an oil-immersion objective lens to trap particles,the spherical aberration caused by the mismatch of the refractive index of oil and water will reduce the utilization of the numerical aperture of the objective lens.The work reported in this paper provides a guidance and reference to the force measurement when using trapping beams with different polarization states.
To elucidate the influence of laser polarization state on optical trap stiffness,the threedimensional stiffness of four kinds of optical traps with different polarization states(azimuthally polarized beam,radially polarized beam,linearly polarized beam,and circularly polarized beam)to trap silica beads with different sizes was investigated.The result show that,when the silica bead's size is equivalent to the laser wavelength,the three-dimensional stiffness of circularly polarized beam and linearly polarized beam are larger than those of radially polarized beam and azimuthally polarized beam.With the increase of the silica bead's size,the three-dimensional stiffness of azimuthally polarized beam and radially polarized beam are larger than those of circularly polarized beam and linearly polarized beam.In addition,the experimental results also show that,when using an oil-immersion objective lens to trap particles,the spherical aberration caused by the mismatch of the refractive index of oil and water will reduce the utilization of the numerical aperture of the objective lens.The work reported in this paper provides a guidance and reference to the force measurement when using trapping beams with different polarization states.
引文
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[14]LIANG Yan-sheng,YAO Bao-li,LEI Ming,et al.Calibration of stiffness of optical tweezers in three dimensions with power spectral density method[J].Acta Photonica Sinica,2014,43(5):0535001.梁言生,姚保利,雷铭,等.功率谱密度法标定光镊的三维光阱刚度[J].光子学报,2014,43(5):0535001.
[15]MICHIHATA M,HAYASHI T,TAKAYA Y.Measurement of axial and transverse trapping stiffness of optical tweezers in air using a radially polarized beam[J].Applied Optics,2009,48(32):6143-6151.
[16]KOZAWA Y,SATO S.Optical trapping of micrometer-sized dielectric particles by cylindrical vector beams[J].Optics Express,2010,18(10):10828-10833.
[17]NIEMINEN A T,HECKENBERG R N,RUBINSZTEIN-DUNLOP H.Forces in optical tweezers with radially and azimuthally polarized trapping beams[J].Optics Letters,2008,33(2):122-124.
[18]YAN Shao-hui,YAO Bao-li.Radiation forces of a highly focused radially polarized beam on spherical particles[J].Physical Review A,2007,76(5):053836(1-6).
[19]KAWAUCHI H,YONEZAWA K,KOZAWA Y,et al.Calculation of optical trapping forces on a dielectric sphere in the ray optics regime produced by a radially polarized laser beam[J].Optics Letters,2007,32(13):1839-1841.
[20]GU Yong-qiang,GONG Zan,LOU Li-ren,et al.The numerical aperture utilization ratio of oil immersion objective in optical tweezers[J].Applied Laser,2007,27(2):98-103.谷勇强,龚錾,楼立人,等.光镊中油浸物镜数值孔径利用率的研究[J].应用激光,2007,27(2):98-103.
[21]MLLENBROICH M C,MCALINDEN N,WRIGHT A J.Adaptive optics in an optical trapping system for enhanced lateral trap stiffness at depth[J].Journal of Optics,2013,15(7):075305.
[22]KIRSTINE B,HENRIK F.Power spectrμm analysis for optical tweezers[J].Review of Scientific Instruments,2001,75(3):594-612.
[23]VERMEULEN K C,WUITE G L,STIENEN G J,et al.Optical trap stiffness in the presence and absence of spherical aberrations[J].Applied Optics,2006,45(8):1812-1819.
[2]CHU S.Laser manipulation of atoms and particles[J].Science,1991,253(5022):861-866.
[3]DHOLAKIA K,REECE P,GU M.Optical micromanipulation[J].Chemical Society Reviews,2007,37(1):42-55.
[4]MEHTA A,RIEF M,SPUDICH J,et al.Single-molecule biomechanics with optical methods[J].Science,1999,283(5408):1689-1695.
[5]BUSTAMANTE C,SMITH S,LIPHARDT J,et al.Single molecule studies of DNA mechanics[J].Current Opinion in Structural Biology,2000,10(3):279-285.
[6]HUANG Chun-cheng,WANG Chia-fong,MEHTA D S,et al.Optical tweezers as sub-pico-newton force transducers[J].Optics Communications,2001,195(1):41-48.
[7]CHEN Hong-tao,LI Yin-mei,LOU Li-ren,et al.Experimental conditions dependences of trap stiffness in Optical Tweezers[J].Chinese Journal of Lasers,2004,31(11):1361-1366.陈洪涛,李银妹,楼立人,等.光阱刚度与实验条件的依赖关系[J].中国激光,2004,31(11):1361-1366.
[8]ROHRBACH A.Stiffness of optical traps:quantitative agreement between experiment and electromagnetic theory[J].Physical Review Letters,2005,95(16):168102(1-4).
[9]BORMUTH V,JANNASCH A,ANDER M,et al.Optical trapping of coated microspheres[J].Optics Express,2008,16(18):13831-13844.
[10]ZHAN Qi-wen.Trapping metallic Rayleigh particles with radial polarization[J].Optics Express,2004,12(15):3377-3382.
[11]HUANG Lu,GUO Hong-lian,LI Jia-fang,et al.Optical trapping of gold nanoparticles by cylindrical vector beam[J].Optics Letters,2012,37(10):1694-1696.
[12]FRIESE J E M,NIEMINEN A N,HECKENBERG R N,et al.Optical torque controlled by elliptical polarization[J].Optics Letters,1998,23(1):1-3.
[13]MADADI E,SAMADI A,CHERAGHIAN M,et al.Polarization-induced stiffness asymmetry of optical tweezers[J].Optics Letters,2012,37(17):3519-3521.
[14]LIANG Yan-sheng,YAO Bao-li,LEI Ming,et al.Calibration of stiffness of optical tweezers in three dimensions with power spectral density method[J].Acta Photonica Sinica,2014,43(5):0535001.梁言生,姚保利,雷铭,等.功率谱密度法标定光镊的三维光阱刚度[J].光子学报,2014,43(5):0535001.
[15]MICHIHATA M,HAYASHI T,TAKAYA Y.Measurement of axial and transverse trapping stiffness of optical tweezers in air using a radially polarized beam[J].Applied Optics,2009,48(32):6143-6151.
[16]KOZAWA Y,SATO S.Optical trapping of micrometer-sized dielectric particles by cylindrical vector beams[J].Optics Express,2010,18(10):10828-10833.
[17]NIEMINEN A T,HECKENBERG R N,RUBINSZTEIN-DUNLOP H.Forces in optical tweezers with radially and azimuthally polarized trapping beams[J].Optics Letters,2008,33(2):122-124.
[18]YAN Shao-hui,YAO Bao-li.Radiation forces of a highly focused radially polarized beam on spherical particles[J].Physical Review A,2007,76(5):053836(1-6).
[19]KAWAUCHI H,YONEZAWA K,KOZAWA Y,et al.Calculation of optical trapping forces on a dielectric sphere in the ray optics regime produced by a radially polarized laser beam[J].Optics Letters,2007,32(13):1839-1841.
[20]GU Yong-qiang,GONG Zan,LOU Li-ren,et al.The numerical aperture utilization ratio of oil immersion objective in optical tweezers[J].Applied Laser,2007,27(2):98-103.谷勇强,龚錾,楼立人,等.光镊中油浸物镜数值孔径利用率的研究[J].应用激光,2007,27(2):98-103.
[21]MLLENBROICH M C,MCALINDEN N,WRIGHT A J.Adaptive optics in an optical trapping system for enhanced lateral trap stiffness at depth[J].Journal of Optics,2013,15(7):075305.
[22]KIRSTINE B,HENRIK F.Power spectrμm analysis for optical tweezers[J].Review of Scientific Instruments,2001,75(3):594-612.
[23]VERMEULEN K C,WUITE G L,STIENEN G J,et al.Optical trap stiffness in the presence and absence of spherical aberrations[J].Applied Optics,2006,45(8):1812-1819.