Optical Momentum Transfer to Absorbing Mie Particles

Kemp, Brandon A.; Grzegorczyk, Tomasz M.; Kong, Jin Au

doi:10.1103/physrevlett.97.133902

Cited by 69 publications

(50 citation statements)

References 22 publications

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“…The Lorentz force reported in Ref. 47 (actually the internal Chu force for non-magnetic media 24 ) based on the interior fields and the APM is applicable only when the background medium is air. It is for this reason that the interior of a particle can be modeled as the interior of the conventional Einstein-Balaz box experiment 29 (the photon momentum is the Abraham momentum in the interior of the box 26,29 ) only when the background is air.…”

Section: Resultsmentioning

confidence: 99%

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Photon momentum transfer in inhomogeneous dielectric mixtures and induced tractor beams

et al. 2015

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The determination of optical force as a consequence of momentum transfer is inevitably subject to the use of the proper momentum density and stress tensor. It is imperative and valuable to consider the intrinsic scheme of photon momentum transfer, particularly when a particle is embedded in a complex dielectric environment. Typically, we consider a particle submerged in an inhomogeneous background composed of different dielectric materials, excluding coherent illumination or hydrodynamic effects. A ray-tracing method is adopted to capture the direct process of momentum transfer from the complex background medium, and this approach is validated using the modified Einstein-Laub method, which uses only the interior fields of the particle in the calculation. In this way, debates regarding the calculation of the force with different stress tensors using exterior fields can be avoided. Our suggested interpretation supports only the Minkowski approach for the optical momentum transfer to the embedded scatterer while rejecting Peierls's and Abraham's approaches, though the momentum of a stably moving photon in a continuous background medium should be considered to be of the Abraham type. Our interpretation also provides a novel method of realizing a tractor beam for the exertion of negative force that offers an alternative to the use of negative-index materials, optical gain, or highly non-paraxial or multiple-light interference. Keywords: dielectric interface; Minkowski photon momentum transfer; modified Einstein-Laub method; optical pulling force; optical tractor beams INTRODUCTIONFollowing the pioneering work of Marston 1 in acoustics, optical 'tractor beams' have attracted considerable interest by virtue of their unusual mechanism for micromanipulation. [2][3][4][5][6][7][8][9][10][11][12][13] Generally speaking, a tractor beam is a customized light beam that exerts a negative scattering force (NSF) on a scatterer and pulls it opposite to the propagation direction of the light, in contrast to conventional pushing forces. 14 Optical pulling forces provide a novel approach to gradientless optical manipulation techniques distinct from optical tweezers, 15-17 optical conveyors 13,18,19 and nanooptomechanical systems. 20,21 Recently, various types of tractor beams have been experimentally demonstrated using a Gaussian beam with an optical mirror (involving the interference of incident and reflected light beams in certain limited regions) 8 and using dodecane droplets sitting on a dielectric interface. 22 However, in the presence of a high-powered laser, hydrodynamic effects (uneven heat dissipation, particle absorption, temperature gradients, liquid convection, surface energy wells, etc.) may also contribute. Moreover, the stability criteria for tractor beams, which are very important for practical application, have not yet been investigated.Although the mechanical effect has been demonstrated 22 to be an overall consequence of all possible contributing factors, the mechanism of the optical momentum transfer from a mixe...

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Section: Resultsmentioning

confidence: 99%

“…22). If the background medium is not air, then the Lorentz force 47 on the interior of the embedded particle should be modified. From our point of view, the interior mechanical force should be calculated via the time-averaged modified Einstein-Laub (MEL) stress tensor: 48…”

Section: Resultsmentioning

confidence: 99%

Photon momentum transfer in inhomogeneous dielectric mixtures and induced tractor beams

et al. 2015

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“…[1][2][3][4][5][6][7][8][9] This paper investigates the laser induced optical forces of metallic nanoparticle clusters when their localized surface plasmons ͑SPs͒ are excited. Such forces are important because they may affect the signal of surface enhanced Raman spectroscopy 10,11 or promote controllable aggregation of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Electrodynamics study of plasmonic bonding and antibonding forces in a bisphere

Tang

Chan

2008

Phys. Rev. B

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Light excitation of surface plasmons in metallic nanoparticle clusters can induce huge forces. We study such forces by using an electrodynamics approach, which fully incorporates the retardation effect. As two particles approach each other, the single-particle plasmons hybridize and split into attractive bonding modes and repulsive antibonding modes, which eventually evolve into an attractive band and a repulsive band. At an intensity of about 0.05 W / m 2 , the force can reach nano-Newtons and, hence, can dominate over other relevant interactions.

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“…Such nondiffracting beams can also trap particles in its cross section due to the transverse field gradient [1,2]. However, the pulling is forbidden by momentum conservation [10,11] and, thus, cannot be achieved by a single paraxial nondiffracting light.…”

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confidence: 99%