用模拟光涡旋发射机实现连续成形轨道Angular Momentum
Continuously Shaping Orbital Angular Momentum with an Analog Optical Vortex Transmitter
摘要：
光的动态产生使微粒子的复杂操纵、高维量子纠缠和光通信成为可能。我们报道了一种由一个双向对称光栅和一个光阑组成的模拟涡旋发射器，它能发射出平均OAM值在整个有理范围内连续变化的光涡旋。该衍射发射器利用沿对称轴线性变化的横向位错，在实现宽带光涡旋的同时，保持了具有等间距奇点的新型纺锤形相位，具有额外的自由度。它通过包含更多的奇点，无限地增加了光的平均OAM，这与拉盖尔-高斯（LG）和贝塞尔涡旋光束有显著不同。在单个器件中实现OAM的模拟生成，该技术可以潜在地扩展到其他频率，并应用于量子物理、非周期光子学和光学操纵的广泛发展。
英文摘要：
Dynamic generation of obitial angular momentum (OAM) of light has enabled complex manipulation of micro-particles, high-dimension quantum entanglement and optical communication. We report an analog vortex transmitter made of one bilaterally symmetric grating and an aperture, emitting optical vortices with the average OAM value continuously variant in the entire rational range. Benefiting from linearly-varying transverse dislocation along its axis of symmetry, this diffractive transmitter possesses extra degree of freedom in engineering broadband optical vortices meanwhile preserving a novel spiniform phase with equally spaced singularities. It unlimitedly increases the average OAM of light by embracing more singularities, which is significantly different from that for Laguerre-Gaussian (LG) and Bessel vortex beams. Realizing analog generation of OAM in a single device, this technique can be potentially extended to other frequencies and applied to a wide spectrum of developments on quantum physics, aperiodic photonics and optical manipulation.
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