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Near field optical atom manipulation(共著)

治彦 伊藤, HARUHIKO ITO

Published Jan 1, 1998• 0 citations
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Summary form only given. The conventional atom-manipulation techniques with propagating light are limited in spatial accuracy by diffraction effects of light waves. In order to overcome the diffraction limit and increase the manipulation accuracy, we can use the optical near field localized in a nanometer region. Such an optical near field is produced by a fiber probe with a nanometric aperture. We consider manipulating atoms by means of the dipole force from the localized optical near field. In this paper we report on the experimental progress toward the realization of atom manipulation with the nanometric fiber probe.

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Summary form only given. Recently, atom manipulation by using optical near fields has been attracting a lot of interests. Optical near field can be localized in a nanometric region, being free from the diffraction limit in contrast to propagation light. The intensity distribution of optical near field decays rapidly as an exponential-like function. Because such a spatially inhomogeneous light field can affect the resonant force on an atom (the so called dipole force), the optical near field produces the strong dipole force. Using the dipole force of the optical near field, we can expect to manipulate an atom with high spatial accuracy. Moreover, due to the resonant character of the dipole force, we can manipulate an atom species- and state-selectively. The optical near field localized in a nanometric region can be generated on the tip of a sharpened fiber-probe. This kind of fiber probe can be used for deflection of the atomic motion, and then trapping of an atom. To this end, it is very important to fabricate the fiber probe suitable for the atoms used. In this case, we must consider several parameters: a size and a shape of the tip, light intensity, frequency detuning, etc. In order to examine the optimal conditions for the fabrication, we measured and evaluated the optical near-field intensity distribution of the fiber-probe.

•May 7, 2000•0 citations
Summary form only given. The conventional atom-manipulation techniques with propagating light are limited in spatial accuracy by diffraction effects of light waves. In order to overcome the diffraction limit and increase the manipulation accuracy, we can use the optical near field localized in a nanometer region. Such an optical near field is produced by a fiber probe with a nanometric aperture. We consider manipulating atoms by means of the dipole force from the localized optical near field. In this paper we report on the experimental progress toward the realization of atom manipulation with the nanometric fiber probe.
Summary form only given. Recently, atom manipulation by using optical near fields has been attracting a lot of interests. Optical near field can be localized in a nanometric region, being free from the diffraction limit in contrast to propagation light. The intensity distribution of optical near field decays rapidly as an exponential-like function. Because such a spatially inhomogeneous light field can affect the resonant force on an atom (the so called dipole force), the optical near field produces the strong dipole force. Using the dipole force of the optical near field, we can expect to manipulate an atom with high spatial accuracy. Moreover, due to the resonant character of the dipole force, we can manipulate an atom species- and state-selectively. The optical near field localized in a nanometric region can be generated on the tip of a sharpened fiber-probe. This kind of fiber probe can be used for deflection of the atomic motion, and then trapping of an atom. To this end, it is very important to fabricate the fiber probe suitable for the atoms used. In this case, we must consider several parameters: a size and a shape of the tip, light intensity, frequency detuning, etc. In order to examine the optimal conditions for the fabrication, we measured and evaluated the optical near-field intensity distribution of the fiber-probe.