Photonics Group, Merchant Venturers School of Engineering, University of Bristol, Bristol, UK.
Science. 2012 Oct 19;338(6105):363-6. doi: 10.1126/science.1226528.
Emerging applications based on optical beams carrying orbital angular momentum (OAM) will probably require photonic integrated devices and circuits for miniaturization, improved performance, and enhanced functionality. We demonstrate silicon-integrated optical vortex emitters, using angular gratings to extract light confined in whispering gallery modes with high OAM into free-space beams with well-controlled amounts of OAM. The smallest device has a radius of 3.9 micrometers. Experimental characterization confirms the theoretical prediction that the emitted beams carry exactly defined and adjustable OAM. Fabrication of integrated arrays and demonstration of simultaneous emission of multiple identical optical vortices provide the potential for large-scale integration of optical vortex emitters on complementary metal-oxide-semiconductor compatible silicon chips for wide-ranging applications.
新兴的基于携带轨道角动量（OAM）的光束的应用可能需要光子集成器件和电路来实现小型化、改善性能和增强功能。我们展示了硅集成的光学涡旋发射器，使用角光栅将限制在 whispering gallery 模式中的光提取出来，这些光带有高 OAM，并将其转化为具有精确可控 OAM 的自由空间光束。最小的器件半径为 3.9 微米。实验特性证实了理论预测，即发射的光束携带精确定义和可调的 OAM。集成阵列的制造和多个相同光学涡旋的同时发射的演示为在互补金属氧化物半导体兼容的硅芯片上大规模集成光学涡旋发射器提供了潜力，可广泛应用于各个领域。
