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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1325-1333 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1273-1280 
    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
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 3 (1984), S. 30-43 
    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
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  • 4
    Publication Date: 2011-08-05
    Description: Author(s): L. Lucchetti, L. Criante, F. Bracalente, F. Aieta, and F. Simoni We report a detailed analysis of optical trapping of low index particles in liquid crystals under experimental conditions that prevent the effect of conventional trapping originated by optical gradient forces. The observation of stable, long-range trapping shows that this phenomenon in liquid crysta... [Phys. Rev. E 84, 021702] Published Thu Aug 04, 2011
    Keywords: Liquid crystals
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
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