Phototunable lasing in dye-doped cholesteric liquid crystals

Chanishvili, Andro; Chilaya, Guram; Petrishvili, Gia; Barberi, Riccardo; Bartolino, Roberto; Cipparrone, Gabriella; Mazzulla, Alfredo; Oriol, Luis
December 2003
Applied Physics Letters;12/29/2003, Vol. 83 Issue 26, p5353
Academic Journal
In this letter, we report the results of phototunable lasing in dye-doped cholesteric liquid crystals (DD–CLC). Photoexcitation of DD–CLC films gives rise to laser emission in the violet-UV range. Control of the structure of the chiral dopant driven by UV phototransformation is exploited in order to obtain a permanent variation of the cholesteric pitch. Laser emission wavelength tuning, by means of photoinduced shifting of the selective reflection band of the cholesteric liquid crystals is established. A tuning interval of about 35 nm, in the wavelength range of 385–415 nm, is observed. © 2003 American Institute of Physics.


Related Articles

  • Optical phase conjugation and efficient wave front correction of weak light beams by dye-doped liquid crystals. Lucchetti, L.; Di Fabrizio, M.; Gentili, M.; Simoni, F. // Applied Physics Letters;12/29/2003, Vol. 83 Issue 26, p5389 

    We report the observation of optical phase conjugation by thin nematic liquid crystal films by using submilliwatt incident power without any external applied field. The light-induced average birefringence evaluated by solving the wave equations for the four interacting waves, is in agreement...

  • Polarized organic electroluminescence: Ordering from the top. Godbert, Nicolas; Burn, Paul L.; Gilmour, Sandra; Markham, Jonathan P.J.; Samuel, Ifor D.W. // Applied Physics Letters;12/29/2003, Vol. 83 Issue 26, p5347 

    We demonstrate a method for achieving polarized organic electroluminescence for liquid crystalline conjugated polymers that allows the polymer to be deposited directly onto the anode. The technique utilizes a top-down alignment approach whereby the predeposited polymer was aligned from above...

  • Density functional approach to the theory of interfacial properties of nematic liquid crystals. Osipov, M. A.; Hess, S. // Journal of Chemical Physics;9/1/1993, Vol. 99 Issue 5, p4181 

    General expressions for the free energy of the nematic liquid crystal in the interfacial region are derived using the density functional approach. The anisotropic part of the surface tension and the coefficients of the Landau–de Gennes theory for the nematic free surface are expressed in...

  • Threshold behavior analysis of in-plane switching mode liquid-crystal cells with asymmetrical... Yoneya, Makoto; Kondo, Katsumi // Applied Physics Letters;6/6/1999, Vol. 74 Issue 23, p3477 

    Studies the threshold behavior of the in-plane switching (IPS) mode liquid-crystal cells with different anchoring strength at liquid-crystal/substrate interfaces. Use of linear stability analysis in the study; Similarity in stability characteristics between the IPS mode and the surface...

  • Defect in the circular-circularly rubbed liquid crystal cell with off-center alignment. Zhuang, Zhizhong; Suh, Seong-Woo; Kim, Young Jin; Patel, J. S.; Patel, J.S. // Applied Physics Letters;5/22/2000, Vol. 76 Issue 21 

    In this letter, we investigate the behavior of the defects in a circular-circularly rubbed liquid crystal cell with an off-center alignment. We show that the line defect forms a circle that passes through the rubbing centers of the two surfaces. The size and the position of the defect circle...

  • Lasing in liquid crystal thin films. Palto, S. P. // Journal of Experimental & Theoretical Physics;Sep2006, Vol. 103 Issue 3, p472 

    A lasing condition is formulated in matrix form for optically anisotropic thin films. Lasing behavior of liquid-crystal slabs is analyzed. In particular, it is shown that if the spatial extent of a liquid crystal slab is much larger than its thickness, then laser emission is feasible not only...

  • Light-induced instabilities driven by competing helical patterns in long-pitch cholesterics. Brasselet, E.; Krimer, D.; Kramer, L. // European Physical Journal E -- Soft Matter;Aug2005, Vol. 17 Issue 4, p403 

    We study theoretically the dynamical reorientation phenomena when a long-pitch cholesteric liquid-crystal film with homeotropic alignment is illuminated by a circularly polarized lightwave. In the present case, the natural cholesteric pitch is of the order of (or larger than) the film thickness....

  • Increased photo- and electroluminescence by zone annealing of spin-coated and vacuum-sublimed amorphous films producing crystalline thin films. Chong-Yang Liu; Bard, Allen J. // Applied Physics Letters;12/29/2003, Vol. 83 Issue 26, p5431 

    Spin-coated and vacuum sublimed amorphous thin films (∼100 nm thick) were converted into single crystalline films with a simple moving-zone-annealing technique, in which a heated metal wire generated a narrow annealed zone in the film as it is moved across the sample. This annealing...

  • Structure and Thermal Fluctuations in Thin Films of Smectic Liquid Crystals. Ostrovskii, B. I.; de Jeu, W. H. // Crystallography Reports;Jul2001, Vol. 46 Issue 4, p680 

    Thermal fluctuations of the smectic layers in freely suspended thin liquid crystalline films have been studied by the methods of X-ray diffraction and reflectometry. The fluctuation dynamics is studied by the methods of photon correlation spectroscopy with the use of a source of coherent...


Read the Article


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

Try another library?
Sign out of this library

Other Topics