Sano Tyler, Black Jennifer, Mitchell Sarah, Zhang Han, Schmidt Holger
Opt Lett. 2020 Nov 1;45(21):5978-5981. doi: 10.1364/OL.404303.
Polydimethylsiloxane-based optofluidics provides a powerful platform for a complete analytical lab-on-chip. Here, we report on a novel on-chip laser source that can be integrated with sample preparation and analysis functions. A corrugated sidewall structure is integrated into a microfluidic channel to form a distributed feedback (DFB) laser using rhodamine 6G dissolved in an ethylene glycol and water solution. Lasing is demonstrated with a threshold pump power of 87.9 µW, corresponding to a pump intensity of 52.7/. Laser threshold and output power are optimized with respect to rhodamine 6G concentration and core index and found to be in good agreement with a rate equation model. Additionally, the laser can be switched on and off mechanically using a pneumatic cell inducing positive pressure on the grating.
基于聚二甲基硅氧烷的光流体技术为完整的芯片实验室分析提供了一个强大的平台。在此，我们报道了一种新型的片上激光源，它可以与样品制备和分析功能集成。一种波纹侧壁结构被集成到微流体通道中，以使用溶解在乙二醇和水溶液中的罗丹明6G形成分布反馈（DFB）激光器。在泵浦阈值功率为87.9 μW（对应泵浦强度为52.7/）的情况下实现了激光发射。针对罗丹明6G浓度和纤芯折射率对激光阈值和输出功率进行了优化，发现与速率方程模型吻合良好。此外，该激光器可以通过在光栅上施加正压的气动单元进行机械开关操作。
