Efficient organic distributed feedback lasers fabricated by thermal nanoimprint

Solid-state lasers based on semiconducting polymers have become an active field of research in the past few years [1]. Polystyrene (PS) films doped with perylenediimide (PDI) derivatives have shown a great potential in this regard due to its highly photostable opticallypumped amplified spontaneous emission (ASE) at low threshold [2]. On the other hand, the use of distributed feedback (DFB) structures as resonant cavities, significantly enhance the lasing properties of organic materials, providing single-mode emission and lower pumping thresholds [1]. In order to get such a structured medium, nanoimprint lithography (NIL) is one of the most promising techniques for grating fabrication, even for future industrial applications, because its high throughput, low cost and high fidelity pattern transfer.