Tunable grain orientation of chalcogenide film and its application for second harmonic generation

• Main Authors: Meng, Yun, Behera, Jitendra Kumar, Wang, Shancheng, Jiang, Minghui, Lin, Jincheng, Wei, Jingsong, Wang, Yang, Cao, Tun, Long, Yi
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Materials; Phase-change Film; Polarized Laser Pulse
• Online Access: https://hdl.handle.net/10356/145171
• Institution: Nanyang Technological University

To date, the second harmonic generation (SHG) has a great effect on photonic devices. However, it is a formidable challenge to achieve reconfigurable SHG. Hereby, we experimentally demonstrate the SHG response from the oriented Ge2Sb2Te5 (GST) grains induced by polarized laser pulses for the first time. The orientation of GST grains is found to be perpendicular to the polarization direction of the pump laser. Such unique ordered structures result in a periodic change of SHG intensity with the input polarization angle of the pump laser rotating every 180°. These findings may pave avenues for generating nonlinear optical sources with a simple process, scalability, and switchable functionality.