Reconfigurable Integrated Optofluidic Droplet Laser Arrays
Reconfigurable Integrated Optofluidic Droplet Laser Arrays
复制标题
可重构集成光流控液滴激光阵列
DOI：
10.1021/acsami.0c05967
复制
发表时间：
2020
影响因子：
9.5
通讯作者：
Sun, Yuze
中科院分区：
文献类型：
--
作者：
Zhang, Han;Palit, Prithviraj;Liu, Yonghao;Vaziri, Seyedmohsen;Sun, Yuze
光流体激光器是一种新兴技术，用于开发小型化光源和生物和化学传感器。然而，迄今为止展示的大多数光流体激光器都是在单光腔水平上操作的，这限制了它们在高通量生化传感、高速波长切换和片上光谱分析中的应用。在这里，我们展示了一个集成微流体的硅芯片上的光流体液滴激光器阵列，其中四个单独的液滴光学腔由一个2 × 2的喷嘴阵列产生和控制。直径范围为115至475 μm的液滴阵列可以根据需要生成、去除和再生。激光阈值在0.63-2.02 μJ/mm ~ 2之间。提出了一种基于图像的激光阈值分析方法，该方法利用低成本的摄像机实现了激光器阵列中所有激光单元的激光阈值的同时测量。与传统的基于光谱的阈值分析方法相比，基于图像的方法得到的激光阈值结果一致。我们的液滴激光器阵列是一项很有前途的技术，可用于开发成本效益高的集成相干光源芯片，用于医疗点应用。
Optofluidic lasers are an emerging technology for the development of miniaturized light sources and biological and chemical sensors. However, most optofluidic lasers demonstrated to date are operated at the single optical cavity level, which limits their applications in high-throughput biochemical sensing, high-speed wavelength switching, and on-chip spectroscopic analysis. Here, we demonstrated an optofluidic droplet laser array on a silicon chip with integrated microfluidics, in which four individual droplet optical cavities are generated and controlled by a 2 × 2 nozzle array. Arrays of droplets with a diameter ranging from 115 to 475 μm can be generated, removed, and regenerated on demand. The lasing threshold of the droplet laser array is in the range of 0.63–2.02 μJ/mm2. An image-based lasing threshold analysis method is developed, which enables simultaneous lasing threshold measurement for all laser units within the laser array using a low-cost camera. Compared to the conventional spectrum-based threshold analysis method, the lasing threshold obtained from the image-based method showed consistent results. Our droplet laser array is a promising technology in the development of cost-effective and integrated coherent light source on a chip for point-of-care applications.