Micro- and nanolasers are miniaturized light sources with great potential in optical imaging, sensing, and communication. While various micro- and nanolasers have been synthesized, they are mostly linearly polarized and thus strongly restricted in many new applications, e.g., chiral resolution in synthetic chemistry, cancerous tissue imaging, information storage, and processing. Herein, we experimentally demonstrate the circularly polarized surface emitting perovskite lasers by integrating the as-grown perovskite microcrystals with an all-dielectric metalens. The perovskite microcrystal serves as an optical microcavity and produces linearly polarized laser emission, which is collected by a geometric phase based TiO₂ metalens. The left-handed circularly polarized components are collimated by the metalens into a directional laser beam with a divergent angle of <0.9°, whereas the right-handed components are strongly diverged by the same metalens. Consequently, the right-handed circularly polarized components are filtered out, and perovskite lasers with high directionality and pure circular polarization have been experimentally realized.

中文翻译：

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实现具有全介电超表面的圆偏振表面发射钙钛矿微激光器

微激光和纳米激光是微型光源，在光学成像，传感和通信领域具有巨大潜力。虽然已经合成了各种微激光器和纳米激光器，但是它们大多是线性极化的，因此在许多新应用中受到严格限制，例如。例如，合成化学中的手性拆分，癌组织成像，信息存储和处理。在这里，我们通过将生长的钙钛矿微晶与全介电金属离子结合在一起，实验性地证明了圆偏振表面发射钙钛矿激光器。钙钛矿微晶充当光学微腔并产生线偏振激光发射，该激光发射由基于几何相的TiO ₂收集金属。左旋圆偏振分量被金属元素准直成发散角<0.9°的定向激光束，而右旋分量被相同的金属元素强烈发散。因此，右旋圆偏振分量被滤除，并且已经实验性地实现了具有高指向性和纯圆偏振的钙钛矿激光器。