Open AccessFast switching ferroelectric liquid crystal Pancharatnam-Berry lens
Author(s) -
Ying Ma,
Alwin Ming Wai Tam,
Xuetao Gan,
Shi Lei,
Abhishek Kumar Srivastava,
Vladimir G. Chigrinov,
Hoi Sing Kwok,
Jianlin Zhao
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.010079
Subject(s) - ferroelectricity , optics , liquid crystal , materials science , polarization (electrochemistry) , diffraction efficiency , lens (geology) , holography , optoelectronics , optical axis , diffraction , physics , dielectric , chemistry
A ferroelectric liquid crystal (FLC) cell with continuously alignment structure is realized by a polarization hologram method for fabricating a Pancharatnam-Berry (PB) lens, which is employed as a concave/convex lens. The PB phase can be maintained by the optical axis in-plane switching; meanwhile, its diffraction efficiency can be tuned in a certain range by electrically controlling azimuthal angle and optical biaxiality of the smectic helical structure realized by deformed helix ferroelectric liquid crystals. The measured diffraction efficiency of the fabricated device is up to 87% and the response time can be 300μs with a low electric voltage. The FLC PB lens can have potential applications in existing optical devices and the realization of FLC with continuous alignment structure can be further used for other LC-based optical devices.