Transverse optical trapping of spherical particle with strong absorption in a focused Gaussian beam

In this work, the transverse optical trapping of spherical particle with strong absorption is studied in geometrical optics model by numerical simulation. In our work, the exact expressions of wave vector are used instead of traditional approximate expressions, and the transverse optical trapping force acting on a spherical particle due to strong absorption is calculated when the particle is illuminated by a focused Gaussian beam of TEM00 mode. The calculated results show that stable transverse optical trapping positions only exist when the center of the spherical particle is located in front of the focus of the beam. Our results also reveal that the trapping positions are decided by the radius of the beam waist ω0. The magnitude of transverse optical trapping force and the stiffness of optical trapping decrease with the increase in ω0.

[1]  Long Hsu,et al.  Optical trapping of a spherically symmetric sphere in the ray-optics regime: a model for optical tweezers upon cells. , 2006, Applied optics.

[2]  Toshimitsu Asakura,et al.  Radiation forces on a dielectric sphere in the Rayleigh scattering regime , 1996 .

[3]  Gérard Gréhan,et al.  Light scattering from a sphere arbitrarily located in a Gaussian beam, using a Bromwich formulation , 1988 .

[4]  Optical measurement of torque exerted on an elongated object by a noncircular laser beam , 2004, physics/0403008.

[5]  S. Chu,et al.  Observation of a single-beam gradient force optical trap for dielectric particles. , 1986, Optics letters.

[6]  A. Ashkin.  Forces of a single-beam gradient laser trap on a dielectric sphere in the ray optics regime. , 1992, Methods in cell biology.

[7]  M E Friese,et al.  Optical torque controlled by elliptical polarization. , 1998, Optics letters.

[8]  Patrick C. Chaumet,et al.  Photonic force spectroscopy on metallic and absorbing nanoparticles , 2005 .

[9]  B G de Grooth,et al.  Experimental and theoretical investigations on the validity of the geometrical optics model for calculating the stability of optical traps. , 1991, Cytometry.

[10]  H. Rubinsztein-Dunlop,et al.  Optical trapping of absorbing particles , 2003, physics/0310022.

[11]  M. Nieto-Vesperinas,et al.  Optical trapping and manipulation of nano-objects with an apertureless probe. , 2002, Physical review letters.

[12]  Lukas Novotny,et al.  Theory of Nanometric Optical Tweezers , 1997 .

[13]  G Gouesbet,et al.  Prediction of reverse radiation pressure by generalized Lorenz-Mie theory. , 1996, Applied optics.

[14]  H. Rubinsztein-Dunlop,et al.  Optical angular-momentum transfer to trapped absorbing particles. , 1996, Physical review. A, Atomic, molecular, and optical physics.

[15]  Kuan Fang Ren,et al.  Radiation pressure forces exerted on a particle arbitrarily located in a Gaussian beam by using the generalized Lorenz-Mie theory, and associated resonance effects , 1994 .

[16]  M J Padgett,et al.  Intrinsic and extrinsic nature of the orbital angular momentum of a light beam. , 2002, Physical review letters.