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We experimentally demonstrate optical trapping of 87Rb atoms using atwo-color evanescent field around an optical nanofiber. In our trappinggeometry, a blue-detuned traveling wave whose polarization is nearly parallelto the polarization of a red-detuned standing wave produces significant vectorlight shifts that lead to broadening of the absorption profile of anear-resonant beam at the trapping site. A model that includes scalar, vector,and tensor light shifts of the probe transition $5S_{1/2}$-$5P_{3/2}$ from thetrapping beams, weighted by the temperature-dependent position of the atoms inthe trap, qualitatively describes the observed asymmetric profile and explainsdifferences with previous experiments that used Cs atoms. The model provides aconsistent way to extract the number of atoms in the trap.

Inhomogeneous broadening of optical transitions of 87Rb atoms in an optical nanofiber trap