arXiv 1405.65472014-05-26physics.optics

扭曲光的角加速度

Angular acceleration with twisted light

Christian Schulze, Filippus S. Roux, Angela Dudley, Ronald Rop, Michael Duparre, Andrew Forbes

备注：: 14 pages, 8 figures

摘要：

人们对剪裁在传播过程中横向加速的波包非常感兴趣。第一个实现是在光学领域，艾里光束。在傍轴近似下，这种光束被证明是横向加速的，同时遵循抛物焦散线，即使质心本身沿着直线路径行进。后来，韦伯和马蒂厄光束形式的非傍轴光场被证明，以及电子的非光学波包。这些领域已经发现了从粒子操纵、时空束控制、等离子体控制到非线性光学的大量应用。在这里，我们证明，第一次，光的角加速度，实现了非正则叠加的贝塞尔光束携带轨道角动量。我们表明，通过调整一个单一的参数的加速度和减速度可以不断调整。我们观察到一个意想不到的能量转移机制之间的空间区域的领域，我们研究实验和理论。我们的发现提供了一种新的光学领域，将使物质波和光流的研究。

英文摘要：

There is significant interest in tailoring wave packets that transversely accelerate during propagation. The first realisation was in the optical domain, the Airy beam. Valid in the paraxial approximation, such beams were shown to transversely accelerate while following a parabolic caustic, even if the centroid itself travelled along a rectilinear path. Later, non-paraxial optical fields in the form of Weber and Mathieu beams were demonstrated, as well as non-optical wave packets with electrons. Such fields have found a plethora of applications from particle manipulation, spatial-temporal beam control, plasma control to non-linear optics. Here we demonstrate, for the first time, the angular acceleration of light, achieved by non-canonical superpositions of Bessel beams carrying orbital angular momentum. We show that by adjustment of a single parameter the acceleration and deceleration may be tuned continuously. We observe an unexpected energy transfer mechanism between spatial regions of the field which we investigate experimentally and theoretically. Our findings offer a new class of optical field that will enable studies in matter waves and opto-fluidics.

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摘要：

英文摘要：

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