Observation of the rotational Doppler shift of a white-light, orbital-angular-momentum-carrying beam backscattered from a rotating body
Observation of the rotational Doppler shift of a white-light, orbital-angular-momentum-carrying beam backscattered from a rotating body
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DOI：
10.1364/optica.1.000001
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发表时间：
2014-07-22
期刊：
影响因子：
10.4
通讯作者：
Padgett, Miles J.
中科院分区：
文献类型：
--
作者：
Lavery, Martin P. J.;Barnett, Stephen M.;Padgett, Miles J.
我们观测到了携带轨道角动量的白光光束被旋转物体后向散射后的旋转多普勒频移。与公知的线性位移不同，这种旋转位移与光频无关，因此散射光的每个光谱分量都位移相同的值。因此，即使是白光源也可以引起单值频移。我们表明，这种转变的大小是成比例的OAM的光和不同的OAM状态的叠加产生多个频率边带。白光照明的这种旋转位移的可观测性突出了旋转多普勒效应形成旋转传感器用于旋转物体的远程检测的基础的潜力。(C)2014年美国光学学会
We observe the rotational Doppler shift of an orbital angular momentum (OAM)-carrying white-light beam after it is backscattered from a rotating object. Unlike the well known linear shift, this rotational shift is independent of the optical frequency, and hence each spectral component of the scattered light is shifted by the same value. Consequently, even a white-light source can give rise to a single-valued frequency shift. We show that the size of this shift is proportional to the OAM of the light and that superpositions of different OAM states give rise to multiple frequency sidebands. The observability of this rotational shift for white-light illumination highlights the potential for the rotational Doppler effect to form the basis of a rotational sensor for the remote detection of spinning objects. (C) 2014 Optical Society of America