Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, United Kingdom.
Phys Rev Lett. 2010 Mar 26;104(12):126402. doi: 10.1103/PhysRevLett.104.126402.
We demonstrate the creation of vortices in a macroscopically occupied polariton state formed in a semiconductor microcavity. A weak external laser beam carrying orbital angular momentum (OAM) is used to imprint a vortex on the condensate arising from the polariton optical parametric oscillator (OPO). The vortex core radius is found to decrease with increasing pump power, and is determined by polariton-polariton interactions. As a result of OAM conservation in the parametric scattering process, the excitation consists of a vortex in the signal and a corresponding antivortex in the idler of the OPO. The experimental results are in good agreement with a theoretical model of a vortex in the polariton OPO.
我们演示了在半导体微腔中形成的宏观占据极化激元态中涡旋的产生。利用携带轨道角动量（OAM）的弱外部激光束在由极化激元光参量振荡器（OPO）产生的凝聚物上印上一个涡旋。发现涡旋核的半径随泵浦功率的增加而减小，并由极化激元-极化激元相互作用决定。由于参量散射过程中的 OAM 守恒，激发态由 OPO 信号中的一个涡旋和本征态中的一个相应的反涡旋组成。实验结果与极化激元 OPO 中涡旋的理论模型吻合较好。
