Electro-optic ally forbidden or enhanced spin-to-orbital angular momentum conversion in a focused light beam
Electro-optic ally forbidden or enhanced spin-to-orbital angular momentum conversion in a focused light beam
复制标题
DOI：
10.1364/ol.33.000696
复制
发表时间：
2008-04-01
期刊：
影响因子：
3.6
通讯作者：
She, Weilong
中科院分区：
文献类型：
--
作者：
Chen, Lixiang;She, Weilong
我们证明了聚焦矢量光束中的自旋到轨道角动量的转换可以被经历普克尔斯效应的单轴晶体的电场擦除或增加的空间各向异性所阻止或增强。以聚焦的右手圆偏振准高斯光束入射到电光晶体NbO_3上为例，得到了转换禁止电场E(0)=-16.87kV/cm。特别令人感兴趣的是，在这种效应中产生的单个光子表现出2度自旋自由和轨道角动量的纠缠，并且是电光可控的。(C)2008年美国光学学会。
We demonstrate that the conversion of spin-to-orbital angular momentum in a focused vectorial light beam can be forbidden or enhanced by the electric-field-erased or increased spatial anisotropy of a uniaxial crystal undergoing the Pockels effect. A focused right-handed circularly polarized quasi-Gaussian beam incident on an electro-optic crystal strontium barium niobate is taken to illustrate the effect, and a conversion-forbidden electric field E(0) = - 16.87 kV/cm is found. Of special interest is that single photons generated in this effect exhibit an entanglement of 2 deg of freedom of spin and orbital angular momentum, and it is electro-optically controllable. (C) 2008 Optical Society of America.