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  • 1990-1994  (3)
  • 1980-1984  (2)
Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1949-1951 
    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
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 607-614 
    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
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 53 (1991), S. 314-318 
    ISSN: 1432-0649
    Keywords: 42.00 ; 42.65 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the observation and study of optical bistability in the power transmitted by a twisted nematic liquid crystal bounded by crossed dichroic polarizers. A detailed study of the dependence of the phenomenon on the sample initial temperature has been performed. The effect is a good test for a simple theoretical model which describes the isotropic droplet formation in a nematic sample under laser illumination. A good agreement is found between experimental results and theoretical predictions. Applications of the effect to realize temperature sensors are envisaged.
    Type of Medium: Electronic Resource
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