Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 73: Photonics II
Q 73.2: Vortrag
Freitag, 27. März 2015, 14:45–15:00, B/gHS
Localized surface modification for single mode waveguide generation via Excimer laser scanning mask exposure — •Humza Mirza1,2, Bin Wu1, Sabine Tiedeken1, Volker Braun1, Hans Joseph Brückner1, and Ulrich Teubner1,2 — 1Institut für Laser und Optik, Hochschule Emden/Leer - University of Applied Sciences, Constantiaplatz 4, D-26723 Emden — 2Institut für Physik, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg
Localized surface modification of a planar Polymethylmethacrylate (PMMA) substrate is investigated using different irradiation parameters. In particular, a 248nm Excimer laser pulses in combination with a contact mask in scanning mode are used to fabricate waveguides of 2-15µm width. An elementary approach was opted to establish a model to find suitable irradiation parameters for the generation of single mode waveguides. Comparison was made to the measured mode field diameter (MFD). The change in the generated refractive index was calculated without using any further direct measuring methods and estimated to be of the order of 10−3. Using a beam profile measurement system, through calibration of the near field image of a single mode 620 nm fiber, its values were cross referenced with the values derived from the inscribed waveguides. Deduced MFDs were compared to numerical mode field simulations. The results of the present investigations depict satisfactory single mode waveguiding with large mode field diameters.