微激光器发射手性的光学控制
Optically controlling the emission chirality of microlasers
摘要：
螺旋光束携带的轨道角动量是光子的无限自由度，在现代光子学中具有广阔的应用前景。到目前为止，携带OAM的相干光的集成源是基于谐振器的，其设计强加了波前的单一的、不可剪裁的手性（即，顺时针或逆时针涡旋）。在这里，我们提出并证明了实现的集成微激光器的手性的波前可以光学控制。重要的是，我们使用的方案，基于半导体微腔中光子的有效自旋轨道耦合，可以扩展到不同的激光器架构，从而为实现新一代具有可调谐手性的OAM微激光器铺平了道路。
英文摘要：
Orbital angular momentum (OAM) carried by helical light beams is an unbounded degree of freedom of photons that offers a promising playground in modern photonics. So far, integrated sources of coherent light carrying OAM are based on resonators whose design imposes a single, non-tailorable chirality of the wavefront (i.e. clockwise or counter clockwise vortices). Here, we propose and demonstrate the realization of an integrated microlaser where the chirality of the wavefront can be optically controlled. Importantly, the scheme that we use, based on an effective spin-orbit coupling of photons in a semiconductor microcavity, can be extended to different laser architectures, thus paving the way to the realization of a new generation of OAM microlasers with tunable chirality.
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