title: Spatially band-tunable color-cone lasing emission in a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant.
abstract: This study investigates a spatially band-tunable color-cone lasing emission (CCLE) based on a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant (IBM). Experimental results show that the lasing band of the formed CCLE of the cell with a photoinduced pitch gradient can be spatially tuned among various color regions by adjusting the pumped position of the cell. The spatially band tunability of the laser results from the UV-irradiation-induced decrease of the helical twisting power of IBM via trans-->cis isomerization, accordingly shrinking the pitch of the cholesteric-liquid-crystal host. The total spatially tunable wavelength range for the laser exceeds 100 nm.
authors.affiliation: Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701. crlee@mail.ncku.edu.tw
authors.forename: C-R
authors.initials: CR
authors.lastname: Lee
authors.forename: S-H
authors.initials: SH
authors.lastname: Lin
authors.forename: H-S
authors.initials: HS
authors.lastname: Ku
authors.forename: J-H
authors.initials: JH
authors.lastname: Liu
authors.forename: P-C
authors.initials: PC
authors.lastname: Yang
authors.forename: C-Y
authors.initials: CY
authors.lastname: Huang
authors.forename: H-C
authors.initials: HC
authors.lastname: Yeh
authors.forename: T-D
authors.initials: TD
authors.lastname: Ji
authors.forename: C-H
authors.initials: CH
authors.lastname: Lin