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arXiv 1808.06294quant-phphysics.optics
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光场对双optical fiber附近二能级原子的作用力

Force of light on a two-level atom near an ultrathin optical fiber

Fam Le Kien, D F Kornovan, S Sahar S Hejazi, Viet Giang Truong, M I Petrov, Sile Nic Chormaic, Thomas Busch

摘要:

利用模函数方法和格林张量技术研究了单模光纤中光对二能级原子的作用力。我们表明,总的力包括驱动场力,自发辐射反冲力,和纤维诱导范德华势。由于在引导模式中存在场的非零轴向分量,拉比频率以及因此引导驱动场的力的大小可以取决于传播方向。当原子偶极在对称平面内旋转时,由于原子的自发发射沿相反的传播方向不对称,会产生自发发射反冲力。基态原子的范德华势是非共振的,与激发态原子的范德华势的非共振部分相反。与基态的电势不同,激发态的电势可以根据从原子到纤维表面的距离而振荡。

英文摘要:

We study the force of light on a two-level atom near an ultrathin optical fiber using the mode function method and the Green tensor technique. We show that the total force consists of the driving-field force, the spontaneous-emission recoil force, and the fiber-induced van der Waals potential force. Due to the existence of a nonzero axial component of the field in a guided mode, the Rabi frequency and, hence, the magnitude of the force of the guided driving field may depend on the propagation direction. When the atomic dipole rotates in the meridional plane, the spontaneous-emission recoil force may arise as a result of the asymmetric spontaneous emission with respect to opposite propagation directions. The van der Waals potential for the atom in the ground state is off-resonant and opposite to the off-resonant part of the van der Waals potential for the atom in the excited state. Unlike the potential for the ground state, the potential for the excited state may oscillate depending on the distance from the atom to the fiber surface.

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