Assembling mesoscopic particles by various optical schemes

Fournier, Jean‐Marc; Rohner, Johann; Jacquot, Pierre; Johann, Robert; Mias, Solon; Salathé, René-P.

doi:10.1117/12.617548

Cited by 15 publications

(14 citation statements)

References 33 publications

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“…The effective NA of those beams is then necessarily diminished, and the gradient force at the focal point is no longer sufficient to counter-balance the forward scattering force. This problem has been addressed, for example, by adding a counter-propagating beam [6], or by using highly reflective optics [8,20]. In some experiments, the scattering force was left unbalanced, in which case the particles were pushed against a sample wall, leading to traps of reduced dimensionality.…”

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Three-dimensional arrays of submicron particles generated by a four-beam optical lattice

Slama-Eliau

Raithel

2011

Phys. Rev. E

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Using an optical lattice formed by four laser beams, we obtain three-dimensional light-induced crystals of 490 nm diameter polystyrene spheres in solution. The setup yields face-centered orthorhombic optical crystals of a packing density of about 40%. An alignment procedure is developed in which the crystals are first prepared near a sample wall, and then in the bulk of the sample. A series of tests is performed that demonstrate particle trapping in all three dimensions.For one case, the trapping force is measured, and good agreement with a simple theoretical model is found. Possible applications are discussed.

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confidence: 99%

“…Their versatility has further increased with the realization of multiple trapping sites. Schemes have been developed that provide a large number of periodic one-dimensional (1D) traps [8] or complex 2D and 3D…”

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confidence: 99%

Three-dimensional arrays of submicron particles generated by a four-beam optical lattice

Slama-Eliau

Raithel

2011

Phys. Rev. E

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“…Within the decade, however, a landmark paper by Burns et al [8] verified the effect experimentally, and introduced the term 'optical binding'; this work also drew attention to the long-range linearly inverse dependence on distance, tempered by an oscillatory factor. The study inspired increasingly adventurous theoretical and experimental investigations [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and the development of quantum electrodynamical studies [23,24]. Mostly, attention has focused on the intensity and distance dependence of the pair forces.…”

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Optically induced potential energy landscapes

Rodríguez

2007

J. Nanophoton

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Abstract. Multi-dimensional potential energy surfaces are associated with optical binding. A detailed exploration of the available degrees of geometric freedom reveals unexpected turning points, producing intricate patterns of local force and torque. Although optical pair interactions outweigh Casimir-Polder coupling even over short distances, the forces are not always attractive. Numerous local potential minimum and maximum can be located, and mapped on contour diagrams. Islands of stability appear, and structures conducive to the formation of rings. The results, based on quantum electrodynamics, apply to optically trapped molecules, nanoparticles, microparticles and colloids.Keywords: Optical binding, optical matter, quantum electrodynamics, optical manipulation, nano-manipulation Electrically neutral molecules and larger nanoparticles, separated from each other beyond significant wavefunction overlap, generally experience weak forces of mutual attraction. Typically, such forces are associated with pair potentials characterized by an inverse sixth power dependence on inter-particle distance. In the case of molecules, the latter feature (the attractive component of a Lennard-Jones interaction) is interpreted as a dynamic coupling of fluctuating electric dipoles. Experimentally verifiable retardation effects modify the distance dependence at longer distances, exhibiting the deeply quantum electrodynamical character of the Casimir-Polder interaction [1-3] -ultimately attributable to virtual photon exchange. The additive effect of pairwise interactions between the constituents of larger particles conveys an inverse sixth power distance relationship into the Hamaker interaction [4], where it determines properties such as adhesion, wetting, multilayer adsorption and colloid flocculation [5,6].A suspicion that intense laser light might engage with virtual photon exchange, producing an optically modified potential energy surface, was first developed into theory by Thirunamachandran almost thirty years ago [7] -but the laser intensities that appeared necessary then represented a major deterrent. Within the decade, however, a landmark paper by Burns et al. [8] verified the effect experimentally, and introduced the term 'optical binding'; this work also drew attention to the long-range linearly inverse dependence on distance, tempered by an oscillatory factor. The study inspired increasingly adventurous theoretical and experimental investigations [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and the development of quantum electrodynamical studies [23,24]. Mostly, attention has focused on the intensity and distance dependence of the pair forces. The pair separation is, however, only one of the geometric degrees of freedom. In this Letter, we present the first results to emerge from an investigation into the complete potential energy surfaces for optically induced interactions. Despite a relative simplicity in the field equations, a richly textured potential energy landscape emerges.For a pair of particles, B di...

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“…While the most popular use of optical forces remains the conventional single optical tweezers, several approaches have been proposed to generate multiple traps including laser scanning, 3 beam reconfiguration by spatial light modulator (SLM), 4 Talbot effect, 5,6 or using interference patterns. [7][8][9][10][11][12] In this latter case, the intensity gradients are generally generated by the interference of several beams (most often 2 to 6).…”

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Multiple optical trapping in high gradient interference fringes

et al. 2006

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In biological investigations, many protocols using optical trapping call for the possibility to trap a large number of particles simultaneously. Interference fringes provide a solution for massively parallel micro-manipulation of mesoscopic objects. Concurrently, the strength of traps can be improved by raising the slope of fringe profiles, such as to create intensity gradients much higher than the ones formed by sinusoidal fringes (Young's fringes). We use a multiple-beam interference system, derived from the classical Fizeau configuration, with semitransparent interfaces to generate walls of light with a very high intensity gradient (Tolansky fringes). These fringes are formed into a trapping set-up to produce new types of trapping templates. The possibility to build multiple trap arrays of various geometries is examined; a high number of particles can be trapped in those potential wells. The period of the fringes can easily be changed in order to fit traps sizes to the dimensions of the confined objects. This is achieved by modifying several parameters of the interferometer, such as the angle and/or the distance between the beam-splitter and the mirror. It is well known that optical trapping presents a great potential when used in conjunction with microfluidics for lab-on-a-chip applications. We present an original solution for multiple trapping integrated in a microfluidic device. This solution does not require high numerical aperture objectives.

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Assembling mesoscopic particles by various optical schemes

Cited by 15 publications

References 33 publications

Three-dimensional arrays of submicron particles generated by a four-beam optical lattice

Three-dimensional arrays of submicron particles generated by a four-beam optical lattice

Optically induced potential energy landscapes

Multiple optical trapping in high gradient interference fringes

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