Scattering of an evanescent light field by a single cesium atom near a nanofiber (11 pages)

Fam Le Kien, S. Dutta Gupta, V. I. Balykin +1 more

В. В. Климов

Fam Le Kien, V. I. Balykin, K. Hakuta

We investigate the scattering of an evanescent light field by a single cesium atom outside a nanofiber. We show that the confinement of the field, the presence of the longitudinal field component and the tangential Poynting vector component, the enhancement of spontaneous emission, and the degeneracy of the atomic ground state substantially affect the scattering process. We find that, in the close vicinity of the fiber surface, the transmittance of the field in the stationary regime can be substantially reduced to 48% due to scattering into radiation modes (with the efficiency as high as 44%) and backward guided modes (with the efficiency as high as 8%).

Fam Le Kien, V. I. Balykin, K. Hakuta

We study the action of the force and torque induced by a guided light field on a cesium atom outside a nanofiber. We demonstrate that the evanescent light field in a circular fundamental guided mode can force the atom to rotate around the nanofiber for a macroscopic time. We find that, due to the action of the torque, the angular momentum of the atom increases with time.

Fam Le Kien, Soni Gupta, K. P. Nayak

S. Sahar S. Hejazi