Abstract
Photophoresis in the slip-flow and free molecular regimes under plane wave illumination is investigated in terms of the asymmetry factor for non-volatile homogeneous low-loss spherical particles with an arbitrary index of refraction. An analytic and closed-form expression for this important factor is derived which can be used to predict photophoretic forces exerted on microparticles of arbitrary size parameters, therefore in any optical (Rayleigh, Mie or geometric) regime. Examples are given in terms of the behavior of both the asymmetry factor and the internal field distribution, showing differences between photophoresis of dielectric, negative index and magnetodielectric particles.
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