Tunnig of optical properties of amorphous, thermally and laser-crystallized chalcogenide-based phase change materials for nanophotonic applications
Provider: Grantová agentura ČR
Programme: Standardní projekty
Implementation period: 01.01.23 - 31.12.25
Workplace:
Fakulta chemicko-technologická - CEMNAT
Investigator: Krbal Miloš
Description:
Today, chalcogenide-based phase change materials are successfully used in nonvolatile memory cells due to their unique ability to quickly and reversibly switch between amorphous and crystalline phases. Their accelerated expansion toward other fields, for example, nanophotonics, calls for accurate knowledge of the optical properties of both their phases as inputs into simulation packages currently used for the optical chip design. However, the optical constants adopted from measurements recorded on as-deposited and thermally crystallized thin films do not necessarily correspond to those occurring in real devices. This project aims to cure this weakness by clarifying the relationship between the specific bonding and the optical constants, including the effect of different chemical compositions and laser fluence during laserinduced re-crystallization and re-amorphization. Planed experiments, supported by ab-initio modeling, elucidate differences in optical constants between deposited, annealed, and lasertreated phases allowing the development of new materials for modern nanophotonics.
Today, chalcogenide-based phase change materials are successfully used in nonvolatile memory cells due to their unique ability to quickly and reversibly switch between amorphous and crystalline phases. Their accelerated expansion toward other fields, for example, nanophotonics, calls for accurate knowledge of the optical properties of both their phases as inputs into simulation packages currently used for the optical chip design. However, the optical constants adopted from measurements recorded on as-deposited and thermally crystallized thin films do not necessarily correspond to those occurring in real devices. This project aims to cure this weakness by clarifying the relationship between the specific bonding and the optical constants, including the effect of different chemical compositions and laser fluence during laserinduced re-crystallization and re-amorphization. Planed experiments, supported by ab-initio modeling, elucidate differences in optical constants between deposited, annealed, and lasertreated phases allowing the development of new materials for modern nanophotonics.
