title: Bichromatic optical switch of diffractive light from a BCT photonic crystal based on an azo component-doped HPDLC.
abstract: This study demonstrates all optical switches between the four diffractive light levels of a body-centered tetragonal photonic crystal. The sample is based on holographic polymer-dispersed liquid crystals that are fabricated using a two-beam interference with multiple exposures. The switching mechanism bases on the effective index modulation of the PC that contains a liquid crystal/azo-dye mixture could be controlled by two pumping laser beams. The switching time between the blue-laser-pumped and the blue-and-green-laser-pumped levels is fast. The study also discusses the switching time of the various levels.
authors.affiliation: Department of Physics, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Ming Shian
authors.initials: MS
authors.lastname: Li
authors.forename: Andy Ying-Guey
authors.initials: AY
authors.lastname: Fuh
authors.forename: Jui-Hsiang
authors.initials: JH
authors.lastname: Liu
authors.forename: Shing-Trong
authors.initials: ST
authors.lastname: Wu
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D003460:Crystallization; D006696:Holography / Q000379:methods*; D007834:Lasers; D008027:Light; D050866:Liquid Crystals; D015233:Models, Statistical; D055095:Optics and Photonics; D017785:Photons; D011108:Polymers / Q000737:chemistry; D013997:Time Factors
chemical_list: D011108:Polymers