Coupled dipole method to compute optical torque: Application to a micropropeller

Chaumet, Patrick C.; Billaudeau, C.

doi:10.1063/1.2409490

Cited by 51 publications

(30 citation statements)

References 55 publications

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“…͑43͒ and ͑35͒ give similar results that differ in units of percent from the exact forces obtained from the Mie approach ͑Chaumet and Nieto-Vesperinas, 2000b͒. The principal advantage of the CDM is its applicability to general object shapes and composition and its easy extension to the optical torque calculations ͑Draine and Flatau, 1994; Draine and Weingartner, 1996;Hoekstra et al, 2001;Chaumet and Billaudeau, 2007͒. It has been shown that the CDM is equivalent to the digitized Green's function method or volume-integral equation formulation in the low-frequency limit kd → 0 ͑Draine and Flatau, 1994͒.…”

Section: Optical Binding Using the Coupled Dipole Methodssupporting

confidence: 51%

Colloquium: Gripped by light: Optical binding

2010

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͑Published 3 June 2010͒The light-matter interaction has been at the heart of major advances from the atomic scale right to the microscopic scale over the past four decades. Confinement by light, embodied by the area of optical trapping, has had a major influence across all of the natural sciences. However, an emergent and powerful topic within this field that has steadily merged but not gained much recognition is optical binding: the importance of exploring the optically mediated interaction between assembled objects that can cause attractive and repulsive forces and dramatically influence the way they assemble and organize themselves. This offers routes for colloidal self-assembly, crystallization, and organization of templates for biological and colloidal sciences. In this Colloquium, this emergent area is reviewed looking at the pioneering experiments in the field and the various theoretical approaches that aim to describe this behavior. The latest experimental studies in the field are reviewed and theoretical approaches are now beginning to converge to describe the binding behavior seen. Recent links between optical binding and nonlinearity are explored as well as future themes and challenges.

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Section: Optical Binding Using the Coupled Dipole Methodssupporting

confidence: 51%

Colloquium: Gripped by light: Optical binding

2010

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“…Also, the second and third terms of (30) have an analogy with those of the dipolar component of the electromagnetic force, whereas those contained in < Γ 0 > keep it with those of the Lorentz's component of the optical force. This duality between the E and B vectors is also evident by comparing (29) with the expression of the electric (e) plus magnetic (m) forces on a magnetodielectric dipolar particle [54]. In this connection, the recoil optical torque, Eq.…”

Section: Arbitrary Incident Wavementioning

confidence: 95%

“…Observations are more difficult to control and to quantitatively interpret with existing models. With few exceptions [34,36], most experimental [27,28] and theoretical [29][30][31][32][33][34]53] studies employ a static formulation, (perhaps following the path of pioneering work [21]), which was shown [37] to be incomplete and not compatible with energy and angular momentum conservation. Only for extremely small (i.e.…”

Section: Introductionmentioning

confidence: 99%

Optical torque: Electromagnetic spin and orbital-angular-momentum conservation laws and their significance

Nieto‐Vesperinas

2015

Phys. Rev. A

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The physics involved in the fundamental conservation equations of the spin and orbital angular momenta leads to new laws and phenomena that are disclosed here. To this end, we analyse the scattering of an electromagnetic wavefield by the canonical system constituted by a small particle, which is assumed dipolar in the wide sense. Specifically, under quite general conditions these laws lead to understanding the contribution and weight of each of those angular momenta to the electromagnetic torque exerted by the field on the object, which is shown to consist of an extinction and a scattering, or recoil, part. This leads to an interpretation of its effect different to that taken up till now by many theoretical and experimental works, and implies that a part of the recoil torque cancels the usually called intrinsic torque which was often considered responsible of the particle spinning. In addition, we obtain the contribution of the spatial structure of the wave to this torque, unknown to this date, showing its effect in the orbiting of the object, and demonstrating that it often leads to a negative torque on a single particle, i.e. opposite to the incident helicity, producing an orbital motion contrary to its spinning. Furthermore, we establish a decomposition of the electromagnetic torque into conservative and non-conservative components in which the helicity and the spin angular momentum play a role analogous to the energy and its flux for electromagnetic forces. These phenomena are illustrated with examples of beams, also showing the difficulties of some paraxial formulations whose fields do not hold the transversality condition.

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“…Except spherical objects, spheroidal or cylindrical ones are also often considered theoretically [39][40][41]. Optical forces acting on particles with more complex shapes must be calculated using numerical approaches -for example, coupled dipole method [42,43], finite element method [44], or finitedifference time-domain method [45][46][47][48]. A Matlab toolbox is available for the calculation of optical forces acting on spherical and spheroidal objects in Gaussian and other beams [49].…”

mentioning

confidence: 99%

Light at work: The use of optical forces for particle manipulation, sorting, and analysis

2008

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We review the combinations of optical micro-manipulation with other techniques and their classical and emerging applications to non-contact optical separation and sorting of micro- and nanoparticle suspensions, compositional and structural analysis of specimens, and quantification of force interactions at the microscopic scale. The review aims at inspiring researchers, especially those working outside the optical micro-manipulation field, to find new and interesting applications of these methods.

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Coupled dipole method to compute optical torque: Application to a micropropeller

Cited by 51 publications

References 55 publications

Colloquium: Gripped by light: Optical binding

Colloquium: Gripped by light: Optical binding

Optical torque: Electromagnetic spin and orbital-angular-momentum conservation laws and their significance

Light at work: The use of optical forces for particle manipulation, sorting, and analysis

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