Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass.

ABSTRACT: Polarization and geometric phase shaping via a space-variant anisotropy has attracted considerable interest for fabrication of flat optical elements and generation of vector beams with applications in various areas of science and technology. Among the methods for anisotropy patterning, imprinting of self-assembled nanograting structures in silica glass by femtosecond laser writing is promising for the fabrication of space-variant birefringent optics with high thermal and chemical durability and high optical damage threshold. However, a drawback is the optical loss due to the light scattering by nanograting structures, which has limited the application. Here, we report a new type of ultrafast laser-induced modification in silica glass, which consists of randomly distributed nanopores elonga

SUBMITTER: Sakakura M 

PROVIDER: S-EPMC7000703 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature