Comprehensive model of the photophoretic force on a spherical microparticle

Pluchino, Antonino B.; Arnold, S.

doi:10.1364/ol.10.000261

Cited by 21 publications

(6 citation statements)

References 11 publications

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“…As shown in Fig. 6, the present predictions of critical condition in terms of a cr agree well with the previous calculations as well as measurements (Pluchino and Arnold 1985). The critical value of the size parameter a cr for negative-positive photophoresis transition depends on the optical properties of the microparticle.…”

Section: Critical Conditions For Negative-positive Photophoresis Transupporting

confidence: 91%

“…Microparticle photophoresis has been attributed to the consequence of thermal creep effect (Yalamov et al 1976;Reed 1977;Arnold and Lewittes 1982;Greene et al 1985a;Pluchino and Arnold 1985;Mackowski 1989;Keh and Tu 2001;Chang and Keh 2005;Keh and Hsu 2005;Phuoc 2005;Yalamov and Khasanov 2006;Takeuchi and Krauss 2008;Shvedov et al 2009;Desyatnikov et al 2009). The thermal creep is a tangential flow of a rarefied gas along the boundary from colder to hotter regions with the presence of tangential temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of transition and mobility of microparticle photophoresis with slip-flow model

Soong

Tzeng

et al. 2010

Microfluid Nanofluid

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The objective of the present study is to investigate photophoretic motion of a spherical microparticle in slip-flow regime of gaseous medium. Energy from incident light absorbed by the particle is calculated by employing Mie scattering theory. Temperature and relative velocity distributions of the gaseous flow around the microparticle are developed using a slip-flow model with consideration of thermal stress slip effect. It is demonstrated that the present results agree well with previous measurements and theoretical predictions. Heat source function and asymmetry factor indicating, respectively, the level and the uneven characteristics of the energy distribution within the particle are evaluated. At low, intermediate, and high absorptivities, three different patterns of asymmetry factor versus size parameter are found and named negative photophoresis prevailing, normal switching of photophoresis, and positive photophoresis dominant. Influences of particle optical properties on the critical size for transition of negative-positive photophoresis are analyzed. The results demonstrate that increasing absorptivity or refractivity of the particle leads to a reduction in critical size for photophoresis transition. Both increase in Knudsen number and reduction in particle-to-gas thermal conductivity ratio enhance the photophoretic mobility.

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Section: Critical Conditions For Negative-positive Photophoresis Transupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Analysis of transition and mobility of microparticle photophoresis with slip-flow model

Soong

Tzeng

et al. 2010

Microfluid Nanofluid

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“…Regarding optical tweezers, the absorption of light by particles in geometrical optics regime is usually neglected in theoretical models and avoided in experiments, since it results in generation of the so-called radiometric forces [36,37]. These are originated from temperature gradients in the medium where the beads are immersed in, and they are called photophoretic forces when caused by light [1,38]. However, radiometric effects have become not only important, but also useful in optical control and manipulation of microparticles.…”

Section: Introductionmentioning

confidence: 99%

How light absorption modifies the radiative force on a microparticle in optical tweezers

et al. 2018

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Reflection and refraction of light can be used to trap small dielectric particles in the geometrical optics regime. Absorption of light is usually neglected in theoretical calculations, but it is known that it occurs in the optical trapping of semi-transparent particles. Here, we propose a generalization of Ashkin's model for the radiative force exerted on a spherical bead, including the contribution due to attenuation/absorption of light in the bulk of the particle. We discuss in detail the balance between refraction, reflection, and absorption for different optical parameters and particle sizes. Our findings contribute to the understanding of optical trapping of light-absorbing particles and may be used to predict whenever absorption is important in real experiments.

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“…The resulting surface temperature gradient will be the source of a fluid convection ͑the so-called "Maxwellian creep" flow͒, which through momentum conservation, will impart a force ͑usually termed "photophoretic"͒ on the system. 31 Estimating the importance of the photophoretic force is a very complex problem by itself, well beyond the scope of this paper. This point will thus remain unanswered, and left as an open question, to be possibly examined in forthcoming experiments.…”

Section: Discussionmentioning

confidence: 99%

Optical tweezers in interaction with an apertureless probe

Chaumet

Pouligny

Dimova

et al. 2007

Journal of Applied Physics

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8 pagesInternational audienceWe study the possibility of transfering a particle held in a far-field optical trap, namely the classical optical tweezers, to a near-field trap, in the form of a tapered metal tip (otherwise called an "apertureless probe"). The paper is theoretical: we compute the electromagnetic fields in both configurations, based on a vectorial nonparaxial representation of the Gaussian laser beam in the waist region. We afterwards use the coupled dipole method to compute the optical force acting on a spherical dielectric particle, in the 0.2−1 mum range in diameter. We find that either repulsion or attraction of the particle by the metal probe is possible, depending on the beam polarization state, particle size, and curvature radius of the metal tip. Equilibrium states of the particle in contact with the tip, under illumination by the laser beam, are predicted

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Comprehensive model of the photophoretic force on a spherical microparticle

Cited by 21 publications

References 11 publications

Analysis of transition and mobility of microparticle photophoresis with slip-flow model

Analysis of transition and mobility of microparticle photophoresis with slip-flow model

How light absorption modifies the radiative force on a microparticle in optical tweezers

Optical tweezers in interaction with an apertureless probe

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