Optical trapping of gold nanoparticles by cylindrical vector beam

Huang, Lu; Guo, Honglian; Li, Jiafang; Lin, Ling; Feng, Baojie; Li, Zhiyuan

doi:10.1364/ol.37.001694

Cited by 129 publications

(49 citation statements)

References 18 publications

(18 reference statements)

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“…The transverse extent of this focal spot can be smaller than that produced by a linearly polarized Gaussian beam, making the CVBs an attractive option for optical tweezers experiments, in which microscopic particles are held in a beam waist by a force that depends on the gradient of intensity across the focus [5,6]. Due to their polarization symmetry, radially polarized beams are predicted to form more efficient optical traps for microparticles [7][8][9][10] and, as a result of the zero axial component of their Poynting vector, have been suggested as a strong candidate for trapping metallic nanoparticles [11], which are otherwise destabilized by the effects of radiation pressure [12][13][14].…”

mentioning

confidence: 99%

Trapping volume control in optical tweezers using cylindrical vector beams

et al. 2012

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We present the result of an investigation into the optical trapping of spherical microparticles using laser beams with a spatially inhomogeneous polarization direction [cylindrical vector beams (CVBs)]. We perform three-dimensional tracking of the Brownian fluctuations in the position of a trapped particle and extract the trap spring constants. We characterize the trap geometry by the aspect ratio of spring constants in the directions transverse and parallel to the beam propagation direction and evaluate this figure of merit as a function of polarization angle. We show that the additional degree of freedom present in CVBs allows us to control the optical trap strength and geometry by adjusting only the polarization of the trapping beam. Experimental results are compared with a theoretical model of optical trapping using CVBs derived from electromagnetic scattering theory in the T-matrix framework.

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confidence: 99%

Trapping volume control in optical tweezers using cylindrical vector beams

et al. 2012

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“…For both structures, the resultant optical torque is enhanced due to the plasmonic polarizability of metallic nanostructures resulting from the collective electrons oscillation. Additionally, optical tweezers has become an important tool for noninvasive manipulation to induce optical force and torque for trapping, moving, aligning and rotating nanostructures in the past decade [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Recently, a spinning spherical Au nanoparticle (NP) irradiated by CP laser beam (830 nm) was found to have a high rotation speed, up to several kHz [12].…”

Section: Introductionmentioning

confidence: 99%

Rotating Au nanorod and nanowire driven by circularly polarized light

Liaw¹,

Chen²,

Kuo³

2014

Opt. Express

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The wavelength-dependent optical torques provided by a circularly polarized (CP) plane wave driving Au nanorod (NR) and nanowire (NW) to rotate constantly were studied theoretically. Using the multiple multipole method, the resultant torque in terms of Maxwell's stress tensor was analyzed. Numerical results show that the optical torque spectrum is in accordance with the absorption spectrum of Au NR/NW. Under the same fluence, the maximum optical torque occurs at the longitudinal surface plasmon resonance (LSPR) of Au NR/NW, accompanied by a severe plasmonic heating. The rotation direction of the light-driven NR/NW depends on the handedness of CP light. In contrast, the optical torque exerted on Au NR/NW illuminated by a linearly polarized light is null at LSPR. Due to the plasmonic effect, the optical torque on Au NR/NW by CP light is two orders of magnitude larger than that on a dielectric NR/NW of the same size. The steady-state rotation of NR/NW in water, resulting from the balance of optical torque and viscous torque, was also discussed. Our finding shed some light on manipulating a CP light-driven Au NR/NW as a rotating nanomotor for a variety of applications in optofluidics and biophysics.

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“…Highly focused radial polarization provides stronger gradient force to pull the particles towards the center of the focus. The feasibility and advantage of using radial polarization to trap metallic nanoparticles have been both theoretically and experimentally demonstrated when the trapping wavelength is far from the plasmon resonance [15]. However, as the trapping laser wavelength approaches the resonance of the nanoparticle, the scattering force become comparable to or even larger than the gradient force owing to the unique vector field distribution of the highly focused radial polarization [16], thus the benefit of using radial polarization appears to be reduced.…”

Section: Introductionmentioning

confidence: 99%

Trapping of resonant metallic nanoparticles with engineered vectorial optical field

Rui

Zhan

2014

Nanophotonics

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Optical trapping and manipulation using focused laser beams has emerged as a powerful tool in the biological and physical sciences. However, scaling this technique to metallic nanoparticles remains challenging due to the strong scattering force and optical heating effect. In this work, we propose a novel strategy to optically trap metallic nanoparticles even under the resonant condition using engineered optical field. The distribution of the optical forces can be tailored through optimizing the spatial distribution of a vectorial optical illumination to favour the stable trapping of a variety of metallic nanoparticles under various conditions. It is shown that this optical tweezers has the ability of generating negative scattering force and supporting stable three-dimensional trapping for gold nanoparticles at resonance while avoiding trap destabilization due to optical overheating. The technique presented in this work offers a versatile solution for trapping metallic nanoparticles and may open up new avenues for optical manipulation.

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Optical trapping of gold nanoparticles by cylindrical vector beam

Cited by 129 publications

References 18 publications

Trapping volume control in optical tweezers using cylindrical vector beams

Trapping volume control in optical tweezers using cylindrical vector beams

Rotating Au nanorod and nanowire driven by circularly polarized light

Trapping of resonant metallic nanoparticles with engineered vectorial optical field

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