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arXiv 0909.2768physics.optics
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轨道angular momentum中光横模和Pancharatnam几何相位的偏振控制演化

Polarization-controlled evolution of light transverse modes and associated Pancharatnam geometric phase in orbital angular momentum

Ebrahim Karimi, Sergei Slussarenko, Bruno Piccirillo, Lorenzo Marrucci, Enrico Santamato

摘要:

本文提出了一种简单、有效、快速的方法,从线偏振TEM $_{00}$激光束出发,产生任意线性组合的光轨道角动量本征态$\ell=\pm 2$。该方法利用了自旋到轨道的角动量转换能力的液晶基$q$板和鸽子棱镜插入在Sagnac偏振干涉仪。标称发电效率为100\%,仅受光学组件中的反射和散射损耗的限制。当输入光束的偏振庞加莱球上遵循闭合路径时,相关的Pancharatnam几何相位不变地转移到输出光束的轨道角动量状态。

英文摘要:

We present an easy, efficient and fast method to generate arbitrary linear combinations of light orbital angular momentum eigenstates $\ell=\pm 2$ starting from a linearly polarized TEM$_{00}$ laser beam. The method exploits the spin-to-orbital angular momentum conversion capability of a liquid-crystal-based $q$-plate and a Dove prism inserted in a Sagnac polarizing interferometer. The nominal generation efficiency is 100\%, being limited only by reflection and scattering losses in the optical components. When closed paths are followed on the polarization Poincaré sphere of the input beam, the associated Pancharatnam geometric phase is transferred unchanged to the orbital angular momentum state of the output beam.

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