Negative azimuthal force of a nanofiber-guided light on a particle

Abstract

We calculate the force of a quasicircularly polarized guided light field of a nanofiber on a dielectric spherical particle. We show that the orbital parts of the axial and azimuthal components of the Poynting vector are always positive while the spin parts can be either positive or negative. We find that, for appropriate values of the size parameter of the particle, the azimuthal component of the force is directed oppositely to the circulation direction of the energy flow around the nanofiber. The occurrence of such a negative azimuthal force indicates that the particle undergoes a negative torque.

13 pages, 10 figures

References in corpus (5)

• Backward Pulling Force from a Forward Propagating Beam
• Optical forces arising from phase gradients
• Efficient channeling of fluorescence photons from single quantum dots into guided modes of optical nanofiber
• Coherence properties of nanofiber-trapped cesium atoms
• Possible sorting mechanism for microparticles in an evanescent field

Cited by in corpus (8)

• Optical manipulation with metamaterial structures
• Universal Spin-Momentum Locked Optical Forces
• Anisotropy in scattering of light from an atom into the guided modes of a nanofiber
• Spin angular momentum in planar and cylindrical waveguides induced by transverse confinement and intrinsic helicity of guided light
• Propagation of nanofiber-guided light through an array of atoms
• Higher-order modes of vacuum-clad ultrathin optical fibers
• Channeling of spontaneous emission from an atom into the fundamental and higher-order modes of a vacuum-clad ultrathin optical fiber
• Spin selection rule for {\it S} level transitions in atomic rubidium under paraxial and nonparaxial two-photon excitation