title: Electrically switchable Fresnel lens using a polymer-separated composite film.
abstract: A Fresnel lens with electrically-tunable diffraction efficiency while possessing high image quality is demonstrated using a phase-separated composite film (PSCOF). The light scattering-free PSCOF is obtained by anisotropic phase separation between liquid crystal and polymer. Such a lens can be operated below 12 volts and its switching time is reasonably fast (~10 ms). The maximum diffraction efficiency reaches ~35% for a linearly polarized light, which is close to the theoretical limit of 41%.
authors.forename: Yun-Hsing
authors.initials: YH
authors.lastname: Fan
authors.forename: Hongwen
authors.initials: H
authors.lastname: Ren
authors.forename: Shin-Tson
authors.initials: ST
authors.lastname: Wu