Femtosecond laser processing, microstructuring of transparent polymers for Lab-on-Chip applications

飞秒激光加工、用于片上实验室应用的透明聚合物的微结构

• 批准号: 468452038
• 负责人: Professor Dr. Uwe Morgner
• 金额: --
• 依托单位: Institut für Quantenoptik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468452038?language=en
• 关键词: Femtosecond; laser; processing; microstructuring; transparent

In recent years, the IQ group has succeeded in using intensive localized femtosecond laser irradiation to demonstrate material modifications and thereby local refractive index increases in the interior of polymer substrates and films and to establish this technique as a reproducible and reliable method. Waveguides of different types with single mode attenuation values below 0.5 dB/cm could be demonstrated. Thus, all previous literature values have been undercut by almost one order of magnitude. The new project focuses on the practical use of femtosecond waveguides and the realization of novel complex waveguide structures under consideration of the full 3D capability of the process. The propagation scattering losses are to be further reduced by beam position stabilization during writing, and software-controlled focus shaping is to be realized by using a transverse phase modulator (SLM) in the writing beam. This enables simultaneous femtosecond laser writing with several adjacent and interrelated foci. By changing the phase mask at the SLM during the writing process, complex 2D and 3D coupler structures can be realized in one go. The first steps towards a 'mobile lab' based on a processed polymer film, which is transparently placed over the display of a smartphone/tablet, are the result. A network of waveguides running in the film is fed individually in multiple colors from the display and transports the light to the front camera, where it is detected sensitively and color resolved. In this way, sensors distributed over the film can be read flexibly. Finally, hollow capillaries can be written in polymer substrates as microfluidic channels with the same femtosecond laser writing setup. Combined with the optical waveguides, an individual integrated lab-on-a-chip is created in a single production step.

近年来，IQ小组已经成功地使用密集的局部飞秒激光照射来证明材料修饰，从而在聚合物衬底和薄膜内部增加局部折射率，并将该技术建立为可重复和可靠的方法。可以得到单模衰减值低于0.5 dB/cm的不同类型的波导。因此，所有以前的文学价值都被削弱了几乎一个数量级。新项目侧重于飞秒波导的实际应用，并在考虑该工艺的全3D能力的情况下实现新型复杂波导结构。在写入过程中通过波束位置稳定进一步降低传输散射损失，并在写入波束中使用横向相位调制器（SLM）实现软件控制的焦点整形。这使得同时飞秒激光写入与几个相邻和相互关联的焦点。通过在写入过程中改变SLM处的相位掩模，可以一次实现复杂的二维和三维耦合器结构。基于加工聚合物薄膜的“移动实验室”的第一步是透明地放置在智能手机/平板电脑的显示屏上。在薄膜中运行的波导网络以多种颜色分别从显示器中输入，并将光传输到前置摄像头，在那里它被灵敏地检测并分辨颜色。通过这种方式，可以灵活地读取分布在薄膜上的传感器。最后，利用相同的飞秒激光写入装置，空心毛细管可以作为微流控通道写入聚合物衬底。结合光波导，一个单独的集成芯片实验室在一个生产步骤中创建。