Ding Hui, Yue Ying, Han Chunyang, Chen Chen, Li Xingwen
Opt Lett. 2019 Sep 1;44(17):4247-4250. doi: 10.1364/OL.44.004247.
The low threshold microlaser is the fundamental component of integrated optical circuits. The fabrication method of the microcavity determines the dimension and threshold of lasers, while the doping method limits the available gain materials and emitted wavelength. Here we propose a silica nanoparticles self-assembly technique to fabricate a microlaser with a radius of ∼100 um and Q factor of 2000. The aggregation state of gain molecules is investigated to be J-type dimers with high fluorescence to support the laser generation. The laser can emit a ∼600 nm waveband multimode laser with a low threshold of ∼12 μJ. Such a laser is promising as a coherent light source integrated on the photonic microchips and opens up a new orientation in material science.
低阈值微激光器是集成光学电路的基本组件。微腔的制造方法决定了激光器的尺寸和阈值，而掺杂方法则限制了可用的增益材料和发射波长。在此，我们提出一种二氧化硅纳米颗粒自组装技术来制造半径约为100μm且品质因数为2000的微激光器。研究发现增益分子的聚集态为具有高荧光的J型二聚体，以支持激光产生。该激光器可发射波长约为600nm的多模激光，阈值低至约12μJ。这种激光器有望作为集成在光子微芯片上的相干光源，并在材料科学领域开辟新的方向。
