Rolled-up TiO_2 microtubes for photonics applications

摘要

The properties of titania (TiO_2) are explored within the context of rolled-up nanotechnology, with particular attention to possible photonics applications. We show how the morphology of titania microtubes, as well as the TiO_2 phase and refractive index, can be controlled by properly tuning the microfabrication parameters. High refractive index TiO_2 tubes are proven to work as microresonators. The possibility of combining the rolling technique with an adequate pre-patterning of the titania membrane could pave the way for the fabrication of a rolled-up diamond-like photonic crystal operating at visible frequencies, as substantiated by theory.