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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 3: Poster

K 3.1: Poster

Tuesday, March 21, 2023, 16:45–17:45, HSZ OG2

Organic distributed feedback lasers based on laser-inscribed periodic surface structures — •Tiange Dong, Tobias Antrack, Jakob Lindenthal, Markas Sudzius, Johannes Benduhn, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute of Applied Physics, Technische Universität Dresden, 01062, Dresden, Germany

Laser ablation, as one of the well-approved alternative methods of photo-lithography in microfabrication, is limited in structuring resolution by the diffraction limit. However, it was observed that a laser-induced periodic surface structure (LIPSS) can be formed under ultrafast laser irradiation, and the periodicity resolution is significantly smaller than the wavelength of the incident laser (λ/2-λ/10). In this work, the periodic structure generated by LIPSS was utilized to build a distributed feedback (DFB) laser based on organic materials. The femtosecond laser (λ = 515 nm) was used to structure the SiO2 substrate, forming a surface grating with a periodicity of about 200 nm. Afterwards, an organic blend (Alq3:DCM, 450 nm thick) was evaporated on the top of the grating as an optically active waveguide. Photo-induced laser emission of the devices was measured under femtosecond optical pumping at 404 nm. We observed a narrow single peak laser emission at 620nm wavelength, which demonstrates optical feedback from the underlying 1st-order DFB structure. Our results show the potential of a laser-induced periodic surface structure to organic photonic devices and microlasers based on the artificially produced photonic structures on a subwavelength scale using laser micromachining techniques.