Free-space information transfer using light beams carrying orbital angular momentum
Free-space information transfer using light beams carrying orbital angular momentum
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DOI：
10.1364/opex.12.005448
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发表时间：
2004-11-01
期刊：
影响因子：
3.8
通讯作者：
Franke-Arnold, S
中科院分区：
文献类型：
--
作者：
Gibson, G;Courtial, J;Franke-Arnold, S
我们证明了传输的信息编码为轨道角动量（OAM）状态的光束。发射器和接收器单元基于空间光调制器，其在八个纯OAM状态之一中准备或测量激光束。我们表明，以这种方式编码的信息是抗窃听的意义上说，任何试图采样的光束远离其轴将受到角度限制和横向偏移，这两者都导致在测量中的固有的不确定性。这给出了一个实验洞察的影响，孔径和光束失调的OAM测量，并演示了OAM的不确定性关系。(C)2004年美国光学学会。
We demonstrate the transfer of information encoded as orbital angular momentum (OAM) states of a light beam. The transmitter and receiver units are based on spatial light modulators, which prepare or measure a laser beam in one of eight pure OAM states. We show that the information encoded in this way is resistant to eavesdropping in the sense that any attempt to sample the beam away from its axis will be subject to an angular restriction and a lateral offset, both of which result in inherent uncertainty in the measurement. This gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM. (C) 2004 Optical Society of America.