Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.
Lab Chip. 2013 Jul 21;13(14):2701-7. doi: 10.1039/c3lc50149c.
We report on a novel approach to realize on-chip microlasers, by applying highly localized and material-saving surface functionalization of passive photonic whispering gallery mode microresonators. We apply dip-pen nanolithography on a true three-dimensional structure. We coat solely the light-guiding circumference of pre-fabricated poly(methyl methacrylate) resonators with a multifunctional molecular ink. The functionalization is performed in one single fabrication step and simultaneously provides optical gain as well as molecular binding selectivity. This allows for a direct and flexible realization of on-chip microlasers, which can be utilized as biosensors in optofluidic lab-on-a-chip applications. In a proof-of-concept we show how this highly localized molecule deposition suffices for low-threshold lasing in air and water, and demonstrate the capability of the ink-lasers as biosensors in a biotin-streptavidin binding experiment.
我们报告了一种通过应用被动光子 whispering gallery 模式微谐振器的高度局域化和节省材料的表面功能化来实现片上微激光器的新方法。我们在真实的三维结构上应用了蘸笔纳米光刻技术。我们仅用多功能分子墨水涂覆预制聚甲基丙烯酸甲酯（PMMA）谐振器的导光圆周。该功能化在一个单一的制造步骤中完成，同时提供光学增益和分子结合选择性。这使得片上微激光器的直接和灵活实现成为可能，并且可以在微流控芯片实验室的光学流体应用中用作生物传感器。在概念验证中，我们展示了这种高度局域的分子沉积如何足以在空气和水中实现低阈值激光，并且证明了该墨水激光器作为生物传感器在生物素-链霉亲和素结合实验中的能力。
