Electro-optic ally forbidden or enhanced spin-to-orbital angular momentum conversion in a focused light beam

被引：26

作者：

Chen, Lixiang ^{[1
]}

She, Weilong ^{[1
]}

机构：

[1] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

来源：

OPTICS LETTERS | 2008年 / 33卷 / 07期

关键词：

D O I：

10.1364/OL.33.000696

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页码：696 / 698

页数：3

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