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  • 1
    Electronic Resource
    Electronic Resource
    Deformations induced by d.c. electric field in cholesteric liquid crystals (1982)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 607-614 
    Details
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riportano i risultati di misure accoppiate di capacità e di riflessione selettiva compiute su una miscela colesterica sottoposta ad un campo elettrico statico orientato parallelamente all'asse dell'elica. Si trova una ben definita sequenza dell'insorgere delle diverse deformazioni se lo spessore del campione è molto piú grande del passo dell'elica. Tre distinte soglie sono misurate per spessori compresi tra 6 μm e 100 μm.
    Abstract: Резюме Мы приводим результаты связанных измерений емкости и селективного оптического отражения, проведенных на холестеричной смеси, помещенной в статическое злектрическое поле, параллельно спиральной оси. Получается определенная иерархия для появления различных деформаций, если толщина образца много больше, чем винтовой шаг. ъыли обнаружены три резко выраженных порога для толщин образцов в диапазоне 6 μm≤d≤100 μm.
    Notes: Summary We report results of coupled capacitance and optical measurements made on a cholesteric mixture submitted to a d.c. electric field parallel to the helical axis. A definite hierarchy for the onset of different deformations is found if the sample thickness is much larger than the helical pitch. Three distinct thresholds are measured for sample thickness in the range 6 μm≤d≤100 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453103
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  • 2
    Electronic Resource
    Electronic Resource
    New optical methods to study director orientation in liquid crystals (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1325-1333 
    Details
    ISSN: 0392-6737
    Keywords: Liquid crystals ; Phase equilibria, phase transitions and critical points of specific substances ; Biophysics of neurophysiological processes (excluding perception processes and speech)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Riportiamo nuovi metodi ottici utili per investigare l’ordine orientazionale di cristalli liquidi nematici. Il primo utilizza una tecnica ottica lineare e una cella a spessore variabile per ottenere una misura precisa delle energie di ancoraggio. Il secondo sfrutta la self phase modulation non lineare per valutare l’anisotropia elastica di un cristallo liquido nematico. Si riportano esempi di misure compiute su cristalli liquidi ad allineamento ibrido.
    Abstract: Резюме Обсуждаются новые оптические метоэы исследования ориентационного порядка в нематических жидких кристаллах. Первый метод исполжзует линейую оптическую технику и ячейки переменной толщины для точных измерений энергии зацепления на границах. Второй метод использует нелинейную фазовую модуляцию для определения упругой анизотропии нематического жидкого кристалла. Приводятся примеры измерений, проведенных на жидких кристаллах гибридной упорядоченностью.
    Notes: Summary We report new optical methods useful to investigate the orientational order of nematic liquid crystals. The first one uses a linear optical technique and a variable-thickness cell to get a precise measurement of the anchoring energies at the boundaries. The second one exploits the nonlinear self-phase modulation to evaluate the elastic anisotropy of a nematic liquid crystal. Examples are reported of measurements performed on hybrid aligned liquid crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455424
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear liquid-crystal interfaces: Determination of the local director orientation (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1273-1280 
    Details
    ISSN: 0392-6737
    Keywords: Nonlinear optics ; Liquid crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We present a new computational method which allows to work out the director orientation in each location of a nematic liquid-crystal cell from a measurement of its reflectivity. We show how it is possible to extract this information from the fringe pattern due to the onset of total internal reflection inside the sample. The very good agreement with the expected results makes the method suitable to study several kinds of deformations occurring in liquid crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450393
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  • 4
    Electronic Resource
    Electronic Resource
    Optical properties of lyotropic mesophases (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 3 (1984), S. 30-43 
    Details
    ISSN: 0392-6737
    Keywords: Liquid crystals ; Optical properties and materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riporta una breve rassegna degli studi preliminari sulle proprietà ottiche delle mesofasi liotropiche. Si presentano nuovi risultati delle misure degli indici di rifrazione per varie fasi di un sistema ternario. Particolare risaltoè dato alle proprietà ottiche delle diverse mesofasi liotropiche di tipo nematico. Infine una breve rassegna è dedicata agli effetti ottici dovuti all'applicazione di campi esterni come il campo magnetico, quello elettrico e quello meccanico.
    Abstract: Резюме Предлагается краткий обзор проведенных исследований оптических свойств лиотропных мезофаз. Приводятся новые результаты измерений показа телей преломления в различных фазах трехкомпонентной системы. Особое внимание уделяется оптическим свойствам различных лиотропных нематических мезофаз. В заключение обсуждаются оптические эффекты, связанные с внешними полями: магнитными, электрическими и механическими.
    Notes: Summary A brief review of early studies of optical properties of lyotropic mesophases is presented. New results about refractive-index measurements in various phases of a ternary system are shown. Emphasis is given to the optical properties of the different lyotropic nematic mesophases. Finally a short review is then devoted to the optical effects of external applied fields such as magnetic, electric and mechanical ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452200
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  • 5
    Electronic Resource
    Electronic Resource
    Coarsening and phase separation in ultraviolet cured polymer dispersed liquid crystals (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 3934-3940 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An extended investigation of the phase separation process in polymer dispersed liquid crystals is presented. A detailed analysis of the experimental results shows that the nucleation and growth of the liquid crystal droplets from the polymeric matrix can be described as the coarsening process occurring in binary alloys. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1290264
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  • 6
    Electronic Resource
    Electronic Resource
    Phase-only modulation by nanosized polymer-dispersed liquid crystals (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 6060-6065 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the preparation methods and electro-optical characterization of polymer-dispersed liquid crystals with nanosized liquid crystal domains obtained by using a multifunctional monomer in a prepolymer mixture that is suitable for a fast photopolymerization process. The electric-field-induced optical phase shift has been measured using a Mach–Zender interferometer, getting values up to π/2 with an applied voltage of about 20 V/μm with no dependence on the light polarization. The high transmittance of the samples make them suitable for photonic devices and telecom applications. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1468252
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  • 7
    Electronic Resource
    Electronic Resource
    Optical nonlinearities induced by thermal effects in polymer dispersed liquid crystals (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 896-897 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The first experimental observation of strong optical nonlinearities induced by a laser field in polymer dispersed liquid crystals is reported. The measured rise time of the effect agrees with the interpretation of a thermal origin of the phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100801
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  • 8
    Electronic Resource
    Electronic Resource
    High resolution polarization gratings in liquid crystals (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3613-3615 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Efficient recording of polarization gratings in dye-doped liquid crystals is reported. By exploiting the effect of light-induced anchoring of the molecular director, it has been possible to write stable holographic gratings with a diffraction efficiency of 8% at a resolution of 1000 lines/mm. The required surface energy density of 0.3 J/cm2 sets these materials among the most sensitive for optical storage. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120457
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  • 9
    Electronic Resource
    Electronic Resource
    Mirrorless all-optical bistability in polymer dispersed liquid crystals (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1949-1951 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the observation of a bistable behavior from dye-doped polymer dispersed liquid crystals. The interpretation of the phenomenon is given in the theoretical framework of an absorption which increases with the excitation of the material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104017
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  • 10
    Electronic Resource
    Electronic Resource
    Nonlinear optical behavior of hybrid aligned nematic liquid crystals
    Amsterdam : Elsevier
    Optics Communications 53 (1985), S. 210-212 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(85)90333-5
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