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  • Title: Fast switching ferroelectric liquid crystal Pancharatnam-Berry lens.
    Author: Ma Y, Tam AMW, Gan XT, Shi LY, Srivastava AK, Chigrinov VG, Kwok HS, Zhao JL.
    Journal: Opt Express; 2019 Apr 01; 27(7):10079-10086. PubMed ID: 31045154.
    Abstract:
    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.
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