title: Bistable light-driven π phase switching using a twisted nematic liquid crystal film.
abstract: A light-activated optical phase switch was developed, exploiting the conversion between left-handed and right-handed twisted nematic liquid crystals. Theoretical and experimental analyses revealed that the handedness inversion of the twisted nematic film altered the optical phase of the output waves by π. Herein, the competition between the helical twisting powers of the two reverse-handed chiral dopants determines the handedness of the twisted nematic film. The photo-responsibility and the bistability are attributed to the azobenzene chromophores in one of the chiral additives.
authors.forename: Chun-Wei
authors.initials: CW
authors.lastname: Chen
authors.forename: Cheng-Chang
authors.initials: CC
authors.lastname: Li
authors.forename: Hung-Chang
authors.initials: HC
authors.lastname: Jau
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Lee
authors.forename: Chun-Ta
authors.initials: CT
authors.lastname: Wang
authors.forename: Tsung-Hsien
authors.initials: TH
authors.lastname: Lin