title: Organic semiconductor distributed feedback laser pixels for lab-on-a-chip applications fabricated by laser-assisted replication.
abstract: The integration of organic semiconductor distributed feedback (DFB) laser sources into all-polymer chips is promising for biomedical or chemical analysis. However, the fabrication of DFB corrugations is often expensive and time-consuming. Here, we apply the method of laser-assisted replication using a near-infrared diode laser beam to efficiently fabricate inexpensive poly(methyl methacrylate) (PMMA) chips with spatially localized organic DFB laser pixels. This time-saving fabrication process enables a pre-defined positioning of nanoscale corrugations on the chip and a simultaneous generation of nanoscale gratings for organic edge-emitting laser pixels next to microscale waveguide structures. A single chip of size 30 mm × 30 mm can be processed within 5 min. Laser-assisted replication allows for the subsequent addition of further nanostructures without a negative impact on the existing photonic components. The minimum replication area can be defined as being as small as the diode laser beam focus spot size. To complete the fabrication process, we encapsulate the chip in PMMA using laser transmission welding.
authors.affiliation: Light Technology Institute (LTI), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany. uli.lemmer@kit.edu.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: Stephan
authors.initials: S
authors.lastname: Prinz
authors.forename: Heino
authors.initials: H
authors.lastname: Besser
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Pfleging
authors.forename: Markus
authors.initials: M
authors.lastname: Wissmann
authors.forename: Christoph
authors.initials: C
authors.lastname: Vannahme
authors.forename: Markus
authors.initials: M
authors.lastname: Guttmann
authors.forename: Timo
authors.initials: T
authors.lastname: Mappes
authors.forename: Sebastian
authors.initials: S
authors.lastname: Koeber
authors.forename: Christian
authors.initials: C
authors.lastname: Koos
authors.forename: Uli
authors.initials: U
authors.lastname: Lemmer