A broadband circularly polarized film

Abstract

Abstract— A circularly polarized film (CPF) was prepared by photopolymerizing the mixture of reactive chiral molecules and reactive nematic liquid crystals (RNLCs). The reflected wavelength of the CPF depends on the ratio of the chiral molecules and nematic liquid crystals. Adding more chiral molecules brings a larger blue shift in the reflected wavelength. Stacks of various reflected wavelength CPFs resulted in a broadband reflection, covering the entire visible spectrum. The photopolymerization of high‐birefringence RNLCs and chiral molecules achieved a monolayer CPF with a wide reflected bandwidth (Δλ > 300 nm). Moreover, the combination of the CPF, quarter‐wavelength plate (QWP), and linear polarizer yielded a brightness gain of 46%.

Thin Film Polarizers: Properties, Technologies and Main Types

“…В [35] Широкополосные поляризаторы и отражатели на основе фотохимической рацемизации (photoracemization) [36] Как правило, ЖК на основе хиральных структур с постоянным шагом спирали имеют достаточно узкую полосу селективного отражения в пределах 100 нм в видимой области спектра [37].…”