期刊
OPTICS EXPRESS
卷 25, 期 1, 页码 377-393出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.25.000377
关键词
-
类别
资金
- Draper Laboratory Fellowship
- Air Force Office of Scientific Research (AFOSR) [FA9550-14-1-0389, FA9550-16-1-0156]
- Charles Stark Draper Laboratory [SC001-0000000959]
- Thorlabs Inc.
- National Science Foundation under NSF [1541959]
Vortex beams are characterized by a helical wavefront and a phase singularity point on the propagation axis that results in a doughnut-like intensity profile. These beams carry orbital angular momentum proportional to the number of intertwined helices constituting the wavefront. Vortex beams have many applications in optics, such as optical trapping, quantum optics and microscopy. Although beams with such characteristics can be generated holographically, spin-to-orbital angular momentum conversion has attracted considerable interest as a tool to create vortex beams. In this process, the geometrical phase is exploited to create helical beams whose handedness is determined by the circular polarization (left/right) of the incident light, that is by its spin. Here we demonstrate high-efficiency Spin-to- Orbital angular momentum-Converters (SOCs) at visible wavelengths based on dielectric metasurfaces. With these SOCs we generate vortex beams with high and fractional topological charge and show for the first time the simultaneous generation of collinear helical beams with different and arbitrary orbital angular momentum. This versatile method of creating vortex beams, which circumvents the limitations of liquid crystal SOCs and adds new functionalities, should significantly expand the applications of these beams. (C) 2017 Optical Society of America
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据