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We calculate the optical potentials, i.e. the light shifts, of the ground andexcited states of atomic cesium in a two-color evanescent field around asubwavelength-diameter fiber. We show that the light shifts of the$6S_{1/2}\leftrightarrow 6P_{3/2}$ transitions can be minimized by tuning onetrapping light to around 934.5 nm in wavelength (central red-detuned magicwavelength) and the other light to around 685.5 nm in wavelength (centralblue-detuned magic wavelength). The simultaneous use of the red- andblue-detuned magic wavelengths allows state-insensitive two-color trapping andguiding of cesium atoms along the thin fiber. Our results can be used toefficiently load a two-color dipole trap by cesium atoms from a magneto-opticaltrap and to perform continuous observations.

State-Insensitive Trapping and Guiding of Cesium Atoms Using a Two-Color Evanescent Field around a Subwavelength-Diameter Fiber