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Precise control of atoms with optical near fields

HARUHIKO ITO

Published Jan 1, 1999• 0 citations
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Development of Optical Engineering. Atom Guidance with Optical Near Field.

Haruhiko Ito, Motoichi Ohtsu

Optical near field realizes the precise control of atomic motion .As the first step, guiding of atoms through micron-sized hollow optical fiber is demonstrated .The two-step laser-photoionization spectroscopy shows the frequency dispersion properties of dipole interaction between atoms and optical near field .The species-and state-selective guidance is applied to in-line spatial separation of two stable Rb isotopes .In addition, the cavity QED (Quantum Electrodynamics) effect inside a dielectric cylinder is observed for the first time.The atom fiber has the faculty of carrying atoms to an arbitrary point over a long distance and then is useful as a novel scheme of optically controlled atomic deposition.The feasibility of creating dot-shaped nano-scale structures is illustrated through measurement of spatial distribution of the guided atom flux .Finally, a method of manipulating atoms beyond the diffraction limit of light waves is presented including sharpened optical fibers and an atomic funnel with optical near field.

The Review of Laser Engineering•Jan 1, 1997•0 citations

Precise control of atoms with optical near fields: deflection and trap

Haruhiko Ito, Akifumi Takamizawa, H. Tanioka +1 more

We present a new scheme of atom manipulation by means of a sharpened optical fiber with near-field light. In particular, we discuss the feasibility of deflecting and trapping Rb atoms. The optical potential produced by the dipole force is estimated from numerical calculations based on the Yukawa-type intensity distribution. We show that a slow Rb atom can be deflected at a large deflection angle. A static atom trap can be made near the tip of a sharpened fiber. A cold Rb atom is captured at the minimum of the trap potential composed of the repulsive optical potential and the attractive van der Waals potential. A spatial intensity distribution of an optical near-field produced near the tip of a protrusion-type fiber is measured in the fiber-to-probe configuration with a shear-force technique. We also describe an atom funnel to form a cold atomic beam required for the near-field light manipulation.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 22, 1999•3 citations

Near-Field Optical Atom Manipulation: Toward Atom Photonics

Motoichi Ohtsu

Springer eBooks•Jan 1, 1998•4 citations
Optical near field realizes the precise control of atomic motion .As the first step, guiding of atoms through micron-sized hollow optical fiber is demonstrated .The two-step laser-photoionization spectroscopy shows the frequency dispersion properties of dipole interaction between atoms and optical near field .The species-and state-selective guidance is applied to in-line spatial separation of two stable Rb isotopes .In addition, the cavity QED (Quantum Electrodynamics) effect inside a dielectric cylinder is observed for the first time.The atom fiber has the faculty of carrying atoms to an arbitrary point over a long distance and then is useful as a novel scheme of optically controlled atomic deposition.The feasibility of creating dot-shaped nano-scale structures is illustrated through measurement of spatial distribution of the guided atom flux .Finally, a method of manipulating atoms beyond the diffraction limit of light waves is presented including sharpened optical fibers and an atomic funnel with optical near field.
We present a new scheme of atom manipulation by means of a sharpened optical fiber with near-field light. In particular, we discuss the feasibility of deflecting and trapping Rb atoms. The optical potential produced by the dipole force is estimated from numerical calculations based on the Yukawa-type intensity distribution. We show that a slow Rb atom can be deflected at a large deflection angle. A static atom trap can be made near the tip of a sharpened fiber. A cold Rb atom is captured at the minimum of the trap potential composed of the repulsive optical potential and the attractive van der Waals potential. A spatial intensity distribution of an optical near-field produced near the tip of a protrusion-type fiber is measured in the fiber-to-probe configuration with a shear-force technique. We also describe an atom funnel to form a cold atomic beam required for the near-field light manipulation.