The effects of multiple scattering to optical forces on a sphere in an evanescent field

Zang, Wei-Ping; Yang, Yang; Zhao, Zhi-Yu; Tian, Jianguo

doi:10.1364/oe.21.012373

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…As shown above, all the interference and azimuthal forces are zero for m = 0; also in this case Eqs. (9)-(10) and (16), show that the total force will be negative when both Re{α s e } and Re{α s m } are positive, [cf. Fig.…”

Section: Optical Forces From Evanescent Bessel Beamsmentioning

confidence: 99%

“…However, in spite of the interest of optical manipulation of particles with subwavelength resolution [13], to date no detailed theory nor controlled experiments exist on the possibilities of both trapping and creating tractor evanescent waves either by TIR or by excitation of surface plasmon polaritons (SPP) at flat surfaces of noble metals [14]. Only some detailed calculations [15,16] report on this problem, although the particles addressed have a low refractive index and thus no strong magnetodielectric resonances.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optical forces from evanescent Bessel beams, multiple reflections, and Kerker conditions in magnetodielectric spheres and cylinders

Auñón

Nieto‐Vesperinas

2014

J. Opt. Soc. Am. A

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In this work we address, first, the optical force on a magnetodielectric particle on a flat dielectric surface due to an evanescent Bessel beam and, second, the effects on the force of multiple scattering with the substrate. For the first question we find analytical solutions showing that due to the interference of the excited electric and magnetic particle dipoles, the vertical force unusually pushes the object out from the plane. The incident wavelength rules whether the illumination constitutes, or not, an optical trap. As for the second problem, we make a 2D study with a single evanescent plane wave, and we present the Kerker conditions, (so far established for spheres), for magnetodielectric cylinders; showing that in p-polarization those are practically reproduced and are associated to minima of the horizontal and vertical forces.

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Section: Optical Forces From Evanescent Bessel Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical forces from evanescent Bessel beams, multiple reflections, and Kerker conditions in magnetodielectric spheres and cylinders

Auñón

Nieto‐Vesperinas

2014

J. Opt. Soc. Am. A

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“…In the above, we consider optical force exerted on the Ag particle by the Gaussian evanescent wave beam. Finally, we investigate the impacts of multiple scattering of this Gaussian evanescent wave between the Ag particle and the interface on the optical forces [36][37][38]. That this can be an issue is because the air-glass interface would induce Fresnel reflection upon the scattering light by the Ag particle, although this effect might not be strong due to small Fresnel reflection coefficients.…”

Section: Resultsmentioning

confidence: 99%

Fano resonance of the ultrasensitve optical force excited by Gaussian evanescent field

Yang¹,

Li²,

Li³

2015

J. Opt.

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In this paper, we study the angle-dependent Fano-like optical force spectra of plasmonic Ag nanoparticles, which exhibit extraordinary transformation from Lorentzian resonance to Fano resonance when excited by a Gaussian evanescent wave. We systematically analyze the behavior of this asymmetric scattering induced optical force under different conditions and find that this Fano interference-induced force is ultrasensitive to the excitation wavelength, incident angle and particle size, as well as the core–shell configuration, which could be useful for wavelength- and angle-dependent size-selective optical manipulation. The origin of this Fano resonance is further identified as the interference between the two adjacent-order multipolar plasmonic modes excited in the Ag particle under the excitation of an inhomogeneously distributed evanescent field.

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“…Using a focused laser beam to trap particles can cause some problems such as the strong localized heating of the specimen near the focal point. Evanescent field trapping can overcome these problems and therefore has found widespread use in optical trapping schemes [2][3][4][5][6][7][8][9][10]. One laser beam can manipulate only one particle, but in some cases, we need configurations to manipulate several particles simultaneously which can be achieved using multiple traps [11,12].…”

Section: Introductionmentioning

confidence: 99%

Theoretical simulation of Gaussian beam interferometric optical tweezers with symmetrical construction

Mohammadnezhad¹,

Saeed²,

Hassanzadeh³

2019

J. Opt.

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Multi-beam optical tweezers can be very effective and suitable for creating optical lattices and dexterous manipulation of the microscopic world. In an earlier work, a symmetrical multi-beam optical tweezers setup was proposed and theoretically investigated. In that study, however, we assumed that the incident beams were plane waves, and a plane wave cannot exist in real situations. The main aim of this paper is to investigate multi-beam optical tweezers under the realistic condition of using the Gaussian beams. The effects of changing the polarization state and the number of incident beams on potential landscapes are investigated. A comparison between the Gaussian beam and plane wave lattices is also performed. The results show that in the case of p-polarization, a very small spot (a sub-λ spot) can be achieved by increasing the number of incident beams. However, for s-polarized incident beams instead of a bright center, a dark center intensity distribution is obtained. The lattices constructed by the interference of the Gaussian beams have deeper traps in the central region compared to the plane wave lattices.

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The effects of multiple scattering to optical forces on a sphere in an evanescent field

Cited by 6 publications

References 27 publications

Optical forces from evanescent Bessel beams, multiple reflections, and Kerker conditions in magnetodielectric spheres and cylinders

Optical forces from evanescent Bessel beams, multiple reflections, and Kerker conditions in magnetodielectric spheres and cylinders

Fano resonance of the ultrasensitve optical force excited by Gaussian evanescent field

Theoretical simulation of Gaussian beam interferometric optical tweezers with symmetrical construction

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