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We propose and demonstrate a scheme for strongly radially confining a singleneutral atom in a bichromatic far-off resonance optical dipole trap(BFORT) .BFORT is composed of a blue-detuned Laguerre-Gaussian $LG^1_ 0$ beam and ared-detuned Gaussian beam. The trapping radial dimension of a single atomtrapped in the Gaussian FORT can be greatly compressed by imposing ablue-detuned Laguerre-Gaussian $LG^1_ 0$ beam with moderate potential depth. Bymodulating the potential depth of the Gaussian FORT we observed that theresonant and parametric excitation of the oscillatory motion of a single atomin this BFORT and obtained the oscillation frequency that well fits predictionfrom the theoretical model. The frequency measurement shows that effectivetrapping dimension can be greatly sharper than that diffraction limited ofmicroscopic objective we used. Then we show that the excess scattering rate dueto imposing blue detuned light can be eliminated when single atoms is close toground-state theoretically. So BFORT suits the purpose of acting as aLamb-Dicke trap for further cooling a single neutral atom to motionground-state and finding application in quantum information progressing.

Combining red- and blue-detuned optical potentials to form a Lamb-Dicke trap for a single neutral atom