Dong Gaoneng, Xiong Meng, Dimopoulos Evangelos, Sakanas Aurimas, Semenova Elizaveta, Yvind Kresten, Yu Yi, Mørk Jesper
Opt Express. 2024 Feb 12;32(4):5242-5251. doi: 10.1364/OE.511425.
Microscopic single-mode lasers with low power consumption, large modulation bandwidth, and ultra-narrow linewidth are essential for numerous applications, such as on-chip photonic networks. A recently demonstrated microlaser using an optical Fano resonance between a discrete mode and a continuum of modes to form one of the mirrors, i.e., the so-called Fano laser, holds great promise for meeting these requirements. Here, we suggest and experimentally demonstrate what we believe is a new configuration of the Fano laser based on a nanobeam geometry. Compared to the conventional two-dimensional photonic crystal geometry, the nanobeam structure makes it easier to engineer the phase-matching condition that facilitates the realization of a bound-state-in-the-continuum (BIC). We investigate the laser threshold in two scenarios based on the new nanobeam geometry. In the first, classical case, the gain is spatially located in the part of the cavity that supports a continuum of modes. In the second case, instead, the gain is located in the region that supports a discrete mode. We find that the laser threshold for the second case can be significantly reduced compared to the conventional Fano laser. These results pave the way for the practical realization of high-performance microlasers.
具有低功耗、大调制带宽和超窄线宽的微观单模激光器对于众多应用至关重要，例如片上光子网络。最近展示的一种微激光器利用离散模式与连续模式之间的光学法诺共振来形成其中一个反射镜，即所谓的法诺激光器，有望满足这些要求。在此，我们提出并通过实验证明了一种基于纳米光束几何结构的法诺激光器新配置。与传统的二维光子晶体几何结构相比，纳米光束结构更易于设计相位匹配条件，从而有助于实现连续域束缚态（BIC）。我们基于新的纳米光束几何结构在两种情况下研究了激光阈值。在第一种经典情况下，增益在空间上位于支持连续模式的腔的部分。而在第二种情况下，增益位于支持离散模式的区域。我们发现，与传统法诺激光器相比，第二种情况的激光阈值可显著降低。这些结果为高性能微激光器的实际实现铺平了道路。
