Direct Generation of Radially Polarized Vector Vortex Beam with an Exciton-Polariton Laser
Direct Generation of Radially Polarized Vector Vortex Beam with an Exciton-Polariton Laser
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DOI：
10.1103/physrevapplied.14.044001
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发表时间：
2020-10-01
影响因子：
4.6
通讯作者：
Deng, Hui
中科院分区：
文献类型：
--
作者：
Hu, Jiaqi;Kim, Seonghoon;Deng, Hui
矢量涡旋光束是一类具有空变偏振奇异性的光束。矢量涡旋光束激光器在成像和通信等领域有着广泛的应用，其中发射高斯光束的垂直腔激光器应用最为广泛。从垂直腔激光器产生矢量涡旋光束需要外部控制或调制。在这里，通过利用偏振选择亚波长光栅作为垂直半导体微腔中的反射器之一，我们设计的极化激元模式的自旋纹理和演示极化激元激射单模，径向偏振矢量涡旋光束。偏振和相位分布的发射的特征在于偏振分辨成像和干涉。这种矢量涡旋激光束产生方法允许低阈值功率、稳定的单模操作、可扩展性和片上集成，所有这些对于成像和通信中的应用都是重要的。
Vector vortex beams are a class of optical beams with singularities in their space-variant polarization. Vector vortex beam lasers have applications in many areas including imaging and communication, where vertical-cavity lasers emitting Gaussian beams have been most widely used so far. Generation of vector vortex beams from vertical-cavity lasers has required external control or modulation. Here, by utilizing a polarization-selective subwavelength grating as one of the reflectors in a vertical semiconductor microcavity, we design the spin textures of the polariton mode and demonstrate polariton lasing in a single-mode, radially polarized vector vortex beam. Polarization and phase distributions of the emission are characterized by polarization-resolved imaging and interferometry. This method of vector vortex laser beam generation allows low threshold power, stable single-mode operation, scalability, and on-chip integration, all of which are important for applications in imaging and communication.