Abstract
We study theoretically the electromagnetic force exerted on a small dielectric particle lying within a planar, dielectric cavity, under plane-wave illumination. We find, in particular, that due to the confinement of an incident wavefield within the cavity, the force exerted on the particle is several orders of magnitude stronger than the corresponding force when the particle is placed next to a single planar slab. We also observed when the particle is placed in the middle of the cavity, it can be trapped at frequencies corresponding to the transmission maxima. We have also found that, for any given position within the cavity, there exist several frequencies for which the particle can be trapped. For the case of a Bragg-stack cavity, there exist more trapping frequencies in a given spectral region allowing for easier optical manipulation of the particle.
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