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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 Tabaru^1,2, Umut Taylan^1,3, 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.