Lee Yang-Chun, Ho Ya-Lun, Lin Bo-Wei, Chen Mu-Hsin, Xing Di, Daiguji Hirofumi, Delaunay Jean-Jacques
Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Nat Commun. 2023 Oct 13;14(1):6458. doi: 10.1038/s41467-023-41471-8.
Controlling the propagation and emission of light via Bloch surface waves (BSWs) has held promise in the field of on-chip nanophotonics. BSW-based optical devices are being widely investigated to develop on-chip integration systems. However, a coherent light source that is based on the stimulated emission of a BSW mode has yet to be developed. Here, we demonstrate lasers based on a guided BSW mode sustained by a gain-medium guiding structure microfabricated on the top of a BSW platform. A long-range propagation length of the BSW mode and a high-quality lasing emission of the BSW mode are achieved. The BSW lasers possess a lasing threshold of 6.7 μJ/mm and a very narrow linewidth reaching a full width at half maximum as small as 0.019 nm. Moreover, the proposed lasing scheme exhibits high sensitivity to environmental changes suggesting the applicability of the proposed BSW lasers in ultra-sensitive devices.
通过布洛赫表面波（BSW）来控制光的传播和发射，在片上纳米光子学领域颇具前景。基于BSW的光学器件正在被广泛研究，以开发片上集成系统。然而，基于BSW模式受激辐射的相干光源尚未被开发出来。在此，我们展示了基于由微纳加工在BSW平台顶部的增益介质波导结构所维持的导模BSW模式的激光器。实现了BSW模式的长程传播长度以及BSW模式的高质量激光发射。这些BSW激光器的激光阈值为6.7 μJ/mm，线宽非常窄，半高全宽小至0.019 nm。此外，所提出的激光方案对环境变化表现出高灵敏度，这表明所提出的BSW激光器在超灵敏器件中的适用性。
