Orbiting of dielectric particles around a single-mode ultrathin fiber waveguide

Georgiy Tkachenko; Ivan Toftul; Viet Giang Truong; Síle Nic Chormaic

doi:10.1117/12.2573514

15 June 2020 Orbiting of dielectric particles around a single-mode ultrathin fiber waveguide

Georgiy Tkachenko, Ivan Toftul, Viet Giang Truong, Síle Nic Chormaic

Proceedings Volume 11522, Optical Manipulation and Structured Materials Conference 2020; 115220F (2020) https://doi.org/10.1117/12.2573514
Event: SPIE Technologies and Applications of Structured Light, 2020, Yokohama, Japan

Abstract

Elliptically polarized evanescent electromagnetic fields can exert a transverse optical force on scattering objects immersed in such fields. We demonstrate this experimentally by setting isotropic, dielectric microspheres into orbital motion around a single-mode ultrathin fiber waveguide. In accordance with the theoretical results, the observed orbiting frequency is proportional to the helicity parameter, which is controlled by the degree of circular polarization of the light coupled to the fiber. The microparticles are rotating against the direction of the energy flow circulation around the fiber, thus verifying the theoretically expected negative optical torque. An important prerequisite for the measurements was the complete polarization control for the ultrathin fiber.

Citation Download Citation

Georgiy Tkachenko, Ivan Toftul, Viet Giang Truong, and Síle Nic Chormaic "Orbiting of dielectric particles around a single-mode ultrathin fiber waveguide", Proc. SPIE 11522, Optical Manipulation and Structured Materials Conference 2020, 115220F (15 June 2020); https://doi.org/10.1117/12.2573514

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KEYWORDS

Waveguides

Particles

Dielectrics

Near field optics

Single mode fibers

Optical fibers

Polarization

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