High-purity orbital angular momentum states from a visible metasurface laser
High-purity orbital angular momentum states from a visible metasurface laser
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DOI：
10.1038/s41566-020-0623-z
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发表时间：
2020-04-27
期刊：
影响因子：
35
通讯作者：
Forbes, Andrew
中科院分区：
文献类型：
--
作者：
Sroor, Hend;Huang, Yao-Wei;Forbes, Andrew
超表面激光器产生量子数达到l = 100的轨道角动量态。同时输出的涡旋光束，δ l可达90，在可见区得到证实。激光的轨道角动量（OAM）为从成像到通信的应用提供了紧凑的源解决方案。然而，从传统的自旋轨道方法中，圆自旋和相反螺旋度OAM态（+/- l）之间的共轭对称性意味着完全控制激光的角动量仍然是难以捉摸的。在这里，我们报道了一种超表面增强激光器，克服了这一限制。我们展示了新的高纯度OAM态，量子数达到l = 100，非对称矢量涡旋光束同时在独立的OAM态上发射，间隔达l = 90，这是对先前对称自旋轨道激光装置的极端违反。我们的激光器方便地输出可见光，产生新的光的OAM状态以及所有以前报道的激光的OAM模式，提供一个紧凑和功率可扩展的源，利用腔内结构物质来创建任意手性状态的结构光。
A metasurface laser generates orbital angular momentum states with quantum numbers reaching l = 100. Simultaneous output vortex beams, with Delta l as great as 90, are demonstrated in the visible regime.Orbital angular momentum (OAM) from lasers holds promise for compact, at-source solutions for applications ranging from imaging to communications. However, conjugate symmetry between circular spin and opposite helicity OAM states (+/- l) from conventional spin-orbit approaches has meant that complete control of light's angular momentum from lasers has remained elusive. Here, we report a metasurface-enhanced laser that overcomes this limitation. We demonstrate new high-purity OAM states with quantum numbers reaching l = 100 and non-symmetric vector vortex beams that lase simultaneously on independent OAM states as much as Delta l = 90 apart, an extreme violation of previous symmetric spin-orbit lasing devices. Our laser conveniently outputs in the visible, producing new OAM states of light as well as all previously reported OAM modes from lasers, offering a compact and power-scalable source that harnesses intracavity structured matter for the creation of arbitrary chiral states of structured light.