Optical angular momentum transfer to microrotors fabricated by two-photon photopolymerization

Asavei, Theodor; Loke, Vincent L. Y.; Barbieri, Marco; Nieminen, Timo A.; Heckenberg, N. R.; Rubinsztein‐Dunlop, Halina

doi:10.1088/1367-2630/11/9/093021

Cited by 57 publications

(49 citation statements)

References 45 publications

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“…However, it is a useful technique for the validation of other methods of measuring torques. 29 For an object of known geometry, the drag torque coefficient will depend on the geometry of the particle, and the viscosity η of the surrounding fluid. The viscosity-independent coefficient C D /η can be calculated using computational fluid dynamics.…”

Section: Indirect Measurement Of Orbital Angular Momentummentioning

confidence: 99%

“…This can be solved numerically using a three-dimensional finite-element solver. 29 However, in many practical application, the viscous drag coefficient is unknown, because either the fluid properties are unknown, the particle geometry is not known sufficiently well, or because nearby objects affect the drag torque. Noting that it is relatively simple to measure the spin contribution to the optical torque, one might inquire as to whether or not it is possible to use measurement of the spin for the determination of the drag torque coefficient, which would allow the total torque to be found from the rotation rate.…”

Section: Indirect Measurement Of Orbital Angular Momentummentioning

confidence: 99%

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Measurement of angular momentum flux in optical tweezers

et al. 2011

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It is well established that a light beam can carry angular momentum and therefore when using optical tweezers it is possible to exert torques to twist or rotate microscopic objects. Both spin and orbital angular momentum can be transferred. This transfer can be achieved using birefringent particles exposed to a Gaussian circularly polarized beam. In this case, a transfer of spin angular momentum will occur. The change in spin, and hence the torque, can be readily measured optically. On the other hand, it is much more challenging to measure orbital angular momentum and torque. Laguerre-Gauss mode decomposition, as used for orbital angular momentum encoding for quantum communication, and rotational frequency shift can be used, and are effective methods in a macro-environment. However, the situation becomes more complicated when a measurement is done on microscale, especially with highly focused laser beams. We review the methods for the measurement of the angular momentum of light in optical tweezers, and the challenges faced when measuring orbital angular momentum. We also demonstrate one possible simple method for a quantitative measurement of the orbital angular momentum in optical tweezers.

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Section: Indirect Measurement Of Orbital Angular Momentummentioning

confidence: 99%

Section: Indirect Measurement Of Orbital Angular Momentummentioning

confidence: 99%

Measurement of angular momentum flux in optical tweezers

et al. 2011

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“…T-matrix calculations of optical resonances in nonspherical particles and particle clusters [4,5,15,18,26,40,48,49,61,72,74,79,[86][87][88][92][93][94]100,154,155,164,169,183,184,197,198,199,211,228,233]. [12,24,25,42,95,113,138,139,189,190,191]. [13,23,26,31,37,40,112,134,153,162,…”

Section: T-matrix Calculations For Particles With One or Several (Eccmentioning

confidence: 99%

Comprehensive T-matrix reference database: A 2006–07 update

Mishchenko

Videen

Khlebtsov

et al. 2008

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tThe T-matrix method is among the most versatile, efficient, and widely used theoretical techniques for the numerically exact computation of electromagnetic scattering by homogeneous and composite particles, clusters of particles, discrete random media, and particles in the vicinity of an interface separating two half-spaces with different refractive indices. This paper presents an update to the comprehensive database of Tmatrix publications compiled by us previously and includes the publications that appeared since 2007. It also lists several earlier publications not included in the original database.Published by Elsevier Ltd.

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“…However, when the object is cut and acquires asymmetry, it may move along other directions, e.g., a stable light lift [16]. Furthermore, when the object is more complex and carefully designed [28][29][30], it may act as an optical motor when illuminated by a light beam. Thus, the engineering of microstructure geometries provide further new ways for optical manipulation.…”

Section: Introductionmentioning

confidence: 99%

Engineering light-matter interaction for emerging optical manipulation applications

et al. 2014

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Abstract:In this review, we explore recent trends in optical micromanipulation by engineering light-matter interaction and controlling the mechanical effects of optical fields. One central theme is exploring the rich phenomena beyond the now established precision measurements based on trapping micro beads with tightly focused beams. Novel synthesized beams, exploiting the linear and angular momentum of light, open new possibilities in optical trapping and micromanipulation. Similarly, novel structures are promising to enable new optical micromanipulation modalities. Moreover, an overview of the amazing features of the optics of tractor beams and backward-directed energy fluxes will be presented. Recently the so-called effect of negative propagation of the beams (existence of the backward energy fluxes) has been confirmed for X-waves and Airy beams. In the review, we will also discuss the negative pulling force of structured beams and negative energy fluxes in the vicinity of fibers. The effect is achieved due to the interaction of multipoles or, in another interpretation, the momentum conservation. Both backward-directed Poynting vector and backward optical forces are counter-intuitive and give an insight into new physics and technologies. Exploiting the degrees of freedom in synthesizing novel beams and designed microstructures offer attractive prospects for emerging optical manipulation applications.

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Optical angular momentum transfer to microrotors fabricated by two-photon photopolymerization

Cited by 57 publications

References 45 publications

Measurement of angular momentum flux in optical tweezers

Measurement of angular momentum flux in optical tweezers

Comprehensive T-matrix reference database: A 2006–07 update

Engineering light-matter interaction for emerging optical manipulation applications

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