Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
O 76.1: Talk
Wednesday, March 18, 2020, 15:30–15:45, WIL A317
Thermally regulated smart mid-infrared modulators enabled by phase-change materials and phase-transition materials — Xinrui Lyu1, Andreas Heßler1, Xiao Wang2, Alfred Ludwig2, Matthias Wuttig1, and •Thomas Taubner1 — 1Institute of Physics (IA), RWTH Aachen University — 2Institute for Materials, Ruhr-University Bochum
Phase-change materials (PCMs) and phase-transition materials (PTMs) both show a large contrast in their optical properties upon switching, enabling compact optical components with diverse functionalities like sensing, thermal imaging and data recording. However, their switching properties differ significantly, i.e., non-volatile for PCMs while volatile for PTMs. For the first time, we combined PCMs, Ge3Sb2Te3 (GST) or In3Sb1Te2 (IST), with the PTM VO2 as active layers in the design of the smart mid-infrared modulators with switchable absorption, reflection, and transmission. The VO2 is employed as a dynamic mirror, switching between transmission (semiconducting VO2) and absorption modes (metallic VO2) with continuously tuned amplitudes up to 90%. Meanwhile, the PCMs on top of the VO2 are used either for continuously shifting the absorption peak (up to 1.8 µm) by switching GST or for switching between reflection (R=0.85) and absorption modes (A=0.99) by switching IST. Merging the concepts of static (PCMs) and dynamic (PTMs) thermal modulation, the presented combination of non-volatile PCMs and volatile PTMs empowers new generation optical components like dynamic thermal imaging and optical switches.