论文标题
纳米结构的GAA/藻类波导制造，用于从连续体的结合状态的低密度极化凝结
Fabrication of Nanostructured GaAs/AlGaAs Waveguide for Low-Density Polariton Condensation from a Bound State in the Continuum
论文作者
论文摘要
激子 - 果龙是杂交光晶状体，它是由激子共振与光子腔模式之间的强耦合产生的。作为玻感激发，它们可以经历相过渡到凝结状态的相位，该状态可以发出连贯的光而无需人口反转。这一方面使它们成为无阈值激光器的良好候选者，但是简短的激子 - 帕尔利顿寿命使得很难在非常低的功率密度下实现冷凝。从这个意义上讲，长期寿命的对称性保护状态是克服单层微腔的有限镜反射率产生的局限性的出色候选者。在这项工作中，我们在连续体中使用光子对称性受保护的结合状态，耦合到激子共振，以实现GAAS/Algaas波导中最新的极性凝结阈值。最重要的是，我们展示了制造控制的影响以及如何通过原子层沉积通过原子层沉积提供了一种减少光栅侧壁上激子淬火的方法。
Exciton-polaritons are hybrid light-matter states that arise from strong coupling between an exciton resonance and a photonic cavity mode. As bosonic excitations, they can undergo a phase transition to a condensed state that can emit coherent light without a population inversion. This aspect makes them good candidates for thresholdless lasers, yet short exciton-polariton lifetime has made it difficult to achieve condensation at very low power densities. In this sense, long-lived symmetry-protected states are excellent candidates to overcome the limitations that arise from the finite mirror reflectivity of monolithic microcavities. In this work we use a photonic symmetry protected bound state in the continuum coupled to an excitonic resonance to achieve state-of-the-art polariton condensation threshold in GaAs/AlGaAs waveguide. Most important, we show the influence of fabrication control and how surface passivation via atomic layer deposition provides a way to reduce exciton quenching at the grating sidewalls.
