TITLE

Optically band-tunable color cone lasing emission in a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant

AUTHOR(S)
Lee, C.-R.; Lin, S.-H.; Ku, H.-S.; Liu, J.-H.; Yang, P.-C.; Huang, C.-Y.; Yeh, H.-C.; Ji, T.-D.
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/15/2010, Vol. 96 Issue 11, p111105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This work demonstrates the feasibility of an optically band-tunable color cone lasing emission (CCLE) based on a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant. Experimental results indicate that the lasing band of the formed CCLE can be tuned optically among various color regions by adjusting the UV irradiated fluence. The optical band tunability of the laser is attributed to the presence of two chiral agents with twisting powers of opposite signs in the cell and the UV-irradiation-induced decrease of the right-handed twisting power of the photoisomerizable chiral dopant via trans→cis isomerization, subsequently inducing the other chiral agent to reduce the structural pitch of the cell. Total tunable wavelength range of the laser exceeds 100 nm. Moreover, the band-tunable laser exhibits a high spectral stability under illumination of a visible light or thermal treatment.
ACCESSION #
48698129

 

Related Articles

  • Modeling of dynamics in liquid crystals from deuterium NMR. Dong, Ronald Y. // Journal of Chemical Physics;3/15/1988, Vol. 88 Issue 6, p3962 

    We present a superimposed rotations model that incorporates a three-site jump model to describe the trans–gauche isomerism of a hydrocarbon chain and a small step rotational diffusion model to describe the reorientation of a mesogen in an ordering potential. The model can be used to...

  • Study of photoisomerization of azo dyes in liquid crystals. Statman, D.; Jánossy, I. // Journal of Chemical Physics;2/15/2003, Vol. 118 Issue 7, p3222 

    The trans-cis isomerization of azo dyes in liquid crystalline hosts is studied. It is shown that the full set of parameters governing the isomerization process can be deduced from polarized pump-probe transmission measurements. The results indicate that the dye order parameter for the trans...

  • Effect of heat and film thickness on a photoinduced phase transition in azobenzene liquid crystalline polyesters. Sánchez, C.; Alcalá, R.; Hvilsted, S.; Ramanujam, P. S. // Journal of Applied Physics;4/15/2003, Vol. 93 Issue 8, p4454 

    The liquid crystal to isotropic phase transition induced with 488 nm light in films of liquid crystalline azobenzene polyesters has been studied as a function of temperature, light intensity, and film thickness. That phase transition is associated with the photoinduced trans-cis-trans...

  • Cholesteric liquid crystal laser with wide tuning capability. Tsung-Hsien Lin; Yi-Jan Chen; Chun-Hui Wu; Fuh, Andy Y.-G.; Liu, J.-H.; Yang, P.-C. // Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p161120 

    This letter examines a planar cholesteric cell (CLC) doped with two collocated laser dyes as a one-dimensional photonic crystal. Adding phototunable chiral material (AzoB) allows the CLC photonic crystal to be lased at the band edges of the photonic band gap with a tuning range of over 100 nm....

  • Observation of transient reorientation of dye-doped liquid crystals by pumped attenuated total reflection. Lo, Kuang-Yao; Huang, Chia-Yi // Applied Physics Letters;8/21/2006, Vol. 89 Issue 8, p081114 

    A transient reorientation of liquid crystals in azo-dye-doped liquid crystals (ADDLCs) is observed by the improved attenuated total reflection leading a pump light into a coupling prism, namely, pumped ATR experiment. The evanescent wave of the pump light induces the photoexcitation of azo dye...

  • Nonlinearly optical–optical isomerization cycle in azobenzene liquid crystal polymers. Liang, Zhongcheng; Ming, Hai; Wang, Pei; Zhang, Jiangying; Xie, Jianping; Zhang, Qijing // Journal of Applied Physics;12/15/2001, Vol. 90 Issue 12, p5866 

    A nonlinearly optical method to induce the birefringence in azo liquid crystal polymers by the optical-optical isomerization cycle (O-O cycle) process is proposed in theory and implemented by experiments. In the O-O cycle, the two isomerization steps of trans-cis and cis-trans are both induced...

  • Catalytic isomerization of terminal olefins in liquid-crystalline polyesters at hydrosilylation with 1-(1′-arylethoxy)-1,1,3,3-tetramethyldisiloxanes. Zuev, V. V.; de Vekki, D. A. // Russian Journal of Organic Chemistry;Aug2006, Vol. 42 Issue 8, p1105 

    Liquid-crystalline compounds based on terephthaloyl-bis(4-oxybenzoates) with terminal double carbon-carbon bonds in aliphatic fragments were prepared. The introduction of polar and easily polarizable groups into the aliphatic fragments was shown to reduce the mesomorphic capacity....

  • Contrasting origins of the isomerization barriers for vinylidene, fluorovinylidene, and difluorovinylidene. Loh, Zhi-Heng; Field, Robert W. // Journal of Chemical Physics;3/1/2003, Vol. 118 Issue 9, p4037 

    The origins of the isomerization barriers for the isomerization of vinylidene (H[sub 2]C==C), fluorovinylidene (HFC==C), and difluorovinylidene (F[sub 2]C==C) to their respective acetylenes are explored in this paper. The bonding interactions present in the transition states of each...

  • 2000 Macromolecular Science and Engineering Award LectureThe versatility of azobenzene polymers. Natansohn, Almeria; Rochon, Paul // Canadian Journal of Chemistry;Jul2001, Vol. 79 Issue 7, p1093 

    The well-known trans�cis�trans photoisomerization of azobenzenes produces at least three different kinds of motion in the polymer materials to which the azobenzenes are bound. The first is a photoinduced motion of the azobenzene groups only, and they can align in a selected position...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics