Orbital angular momentum of photons in noncollinear parametric downconversion
Orbital angular momentum of photons in noncollinear parametric downconversion
复制标题
DOI：
10.1016/j.optcom.2003.09.071
复制
发表时间：
2003-12-01
影响因子：
2.4
通讯作者：
Torner, L
中科院分区：
文献类型：
--
作者：
Molina-Terriza, G;Torres, JP;Torner, L
在几乎共线的相位匹配几何结构中，已经在实验上观察到光子下转换中光的轨道角动量（OAM）的守恒，其中泵浦光子、信号光子和空闲光子几乎沿着相同的方向传播[Nature 412（2001）313]。然而，在这里，我们预测，这样的傍轴测量进行纠缠光子在非共线几何不符合OAM守恒在上述意义上。在适当的条件下，这种视异常的强度接近100%。我们讨论的物理起源的效果，并建议实验方案，它可以被验证。(C)2003 Elsevier B.V.版权所有。
Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate alone almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified. (C) 2003 Elsevier B.V. All right reserved.