标题： 耦合InP纳米线激光器的远场方向性控制 显示英文标题

标题： Far-field directionality control of coupled InP nanowire lasers

摘要： 纳米线（NW）激光器作为紧凑的、相干的片上光源，具有巨大的潜力，这对下一代光通信和成像技术至关重要。 然而，由于激光模式工程和制造的复杂性，控制其发射方向性一直受到阻碍。 在这里，我们通过在不依赖于后外延转移和对准工艺的情况下，精确控制位点选择性纳米线之间的光学耦合，实现了垂直发射的InP纳米线激光器的远场发射的空间工程。 利用这一工艺能力，我们设计并生长了在TE01波导模式下工作的纳米线对和三元组。 然后，我们通过改变它们的光学耦合间隙，展示了将远场发射轮廓从典型的甜甜圈状发射修改为双瓣状发射轮廓的能力，这由模拟和实验轮廓的紧密匹配得到证实。 此外，通过数值模拟，我们通过将纳米线激光器对排列成周期性阵列，进一步提高了远场方向性，证明了定向激光超表面的可行性。 我们的结果为在片上光源中实现相干光生成和光束转向的高效集成提供了基础。 显示英文摘要

摘要： Nanowire (NW) lasers hold great promise as compact, coherent on-chip light sources that are crucial for next-generation optical communication and imaging technologies. However, controlling their emission directionality has been hindered by the complexities of lasing mode engineering and fabrication. Here, we demonstrate spatially-engineered far-field emission from vertically emitting InP NW lasers by establishing precise control over the optical coupling between site-selective NWs, without relying on post-epitaxy transfer and alignment processes. Leveraging this process capability, we design and grow NW pairs and triplets that lase in the TE01 waveguide mode. We then demonstrate the ability to modify their far-field emission profiles from the signature doughnut-like emission to a double-lobed emission profile by changing their optical coupling gap, evidenced by closely matching simulation and experimental profiles. Moreover, through numerical simulations, we show further enhancement in the far-field directionality by arranging the NW laser pairs in a periodic array, demonstrating the feasibility of a directional lasing metasurface. Our results provide a foundation for efficient integration of coherent light generation and beam steering in on-chip light sources.