Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 19, Pages 4275-4277Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.4275
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A theoretical analysis of electromagnetic forces on neutral particles in a hollow waveguide is presented. We show that the effective scattering cross section of a very small (Rayleigh) particle can be strongly modified inside a waveguide. The coupling or the scattered dipolar field with the waveguide modes induces a resonant enhanced backscattering state of the scatterer-guide system close to the onset of new modes. The particle effective cross section can then be as large as the wavelength even far from any transition resonance. As we will show, a small particle can be strongly accelerated along the guide axis while being highly confined in a narrow zone of the cross section of the guide.
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