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- W2757631546 abstract "We investigate the electric quadrupole interaction of an alkali-metal atom with guided light in the fundamental and higher-order modes of a vacuum-clad ultrathin optical fiber. We calculate the quadrupole Rabi frequency, the quadrupole oscillator strength, and their enhancement factors. In the example of a $^{87}mathrm{Rb}$ atom, we study the dependencies of the quadrupole Rabi frequency on the quantum numbers of the transition, the mode type, the phase circulation direction, the propagation direction, the orientation of the quantization axis, the position of the atom, and the fiber radius. We find that the root-mean-square (rms) quadrupole Rabi frequency reduces quickly but the quadrupole oscillator strength varies slowly with increasing radial distance. We show that the enhancement factors of the rms Rabi frequency and the oscillator strength do not depend on any characteristics of the internal atomic states except for the atomic transition frequency. The enhancement factor of the oscillator strength can be significant even when the atom is far away from the fiber. We show that, in the case where the atom is positioned on the fiber surface, the oscillator strength for the quasicircularly polarized fundamental mode ${mathrm{HE}}_{11}$ has a local minimum at the fiber radius $aensuremath{simeq}107$ nm, and is larger than that for quasicircularly polarized higher-order hybrid modes, transverse electric modes, and transverse magnetic modes in the region $a<498.2$ nm." @default.
- W2757631546 created "2017-10-06" @default.
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- W2757631546 date "2018-01-16" @default.
- W2757631546 modified "2023-10-18" @default.
- W2757631546 title "Enhancement of the quadrupole interaction of an atom with the guided light of an ultrathin optical fiber" @default.
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- W2757631546 doi "https://doi.org/10.1103/physreva.97.013821" @default.
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