Berlin 2024 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 10: Thin Film Application
DS 10.7: Vortrag
Mittwoch, 20. März 2024, 16:45–17:00, A 060
Photosensitive silicon oxynitride doped silicon containing wearable Bragg gratings against counterfeit applications — •Ali Karatutlu1, Timuçin Emre Tabaru1,2, Umut Taylan1,3, Zehra Gizem Mutlay1, Hamid-Reza Bahari1, Esra Kendir Tekgül1, Doğukan Hazar Özbey1, Engin Durgun1, and Bülend Ortaç1 — 1UNAM--Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800-Turkey — 2Sivas University of Science and Technology, Mecnun Otyakmaz Street No:1 Sivas 58100, Türkiye — 3Empa, Swiss Federal Laboratories for Materials Science & Technology, Laboratory for Advanced Materials Processing, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
Bragg gratings are utilized in different advanced applications, including lasers, sensing, and spectrometers. This study demonstrates a synthesis of photo-sensitive silicon oxynitride-doped silicon containing distributed Bragg gratings (BGs) on a flexible substrate as a wearable material and utilization of this flexible material in the information storage inscribed by a femtosecond laser light. The BGs were designed and fabricated to possess a unique hyper-spectral reflection behavior from ultra-violet to near-infrared region. To make it user-friendly, the inscribed message *L* can be observed in an indoor or outdoor light at certain viewing angles, such as 45° with respect to the normal surface of the flexible BG. Furthermore, the message can also be observed at certain polarizations. Furthermore, we will show in the framework of ab initio calculations the first-time formation of silicon oxynitride crystals from Si3N4 crystals present in Si layers.
Keywords: silicon oxynitride; flexible waveguide; Bragg grating; femtosecond laser inscription; against counterfeit applications