Light and Heat in a Balancing Act

Dholakia, Kishan; Čižmár, Tomáš

doi:10.1103/physics.5.76

Cited by 1 publication

(1 citation statement)

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“…However, radiometric effects have become not only important, but also useful in optical control and manipulation of microparticles. For example, inhomogeneous heating of the medium was recently reported as an efficient method for optothermal trapping of particles in a hollow-core photonic crystal fiber [39,40]. In usual Gaussian beam setups, the photophoretic forces due to absorption of light by the particles tend to scatter them from the optical region, but they are exactly the same forces responsible to levitate metallic particles in a "doughnut" laser beam [37].…”

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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Section: Introductionmentioning

confidence: 99%