We propose a novel three-dimensional diffraction-limited far-off-resonance optical dipole trap (DFORT) for neutral atoms operating in the Lamb–Dicke regime. Such a microscopic DFORT is generated by the diffracted LP<sub>01</sub> mode of a hollow-core optical fiber near the fiber facet. For <sup>87</sup>Rb and <sup>133</sup>Cs atoms, we estimate that with a 100-mW trap-laser power, a cigar-shaped far-off-resonance optical dipole trap provides potential depth U<sub>0</sub>≃10 mK, radial (axial) trap frequency f<sub>r</sub>≃100 kHz (f<sub>z</sub>≃10 kHz), and trap volume V<sub>trap</sub>≃10<sup>4</sup> λ<sup>3</sup>. The DFORT has the unique feature of a tightly focused trap with a large trap volume and convenient loading and cooling of the precooled atoms, which may be useful for optical Bose–Einstein condensation. A DFORT may be also operated as an elongated one-dimensional optical trap.
© 2003 Optical Society of America
Yong-Il Shin, Myoungsun Heo, Jae-Wan Kim, Wooshik Shim, Heung-Ryoul Noh, and Wonho Jhe, "Diffraction-limited optical dipole trap with a hollow optical fiber," J. Opt. Soc. Am. B 20, 937-941 (2003)