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We propose and investigate a new type of optical waveguide made by an arrayof atoms without involving conventional Bragg scattering or total internalreflection. A finite chain of atoms collectively coupled through theirintrinsic resonance supports a propagating mode with minimal radiative losswhen the array spacing $a$ is around 0.6$\lambda_0/2\pi$ where $\lambda_0$ isthe wavelength of the nearly resonant optical transition. We find that thetransportation is robust with respect to position fluctuation and remainspossible when the atoms are placed on a circle. Our result paves the way toimplement the subwavelength transportation of light in integrated opticalcircuits with cold atoms.

Subwavelength Transportation of Light with Atomic Resonances