Electro-optic effect and influence of bias electric field on the goldstone mode dielectric behavior in smectic C* phase and cell thickness dependence of the dielectric permittivity of a ferroelectric liquid crystal mixture

SS Roy, S Kundu, N Ghosh, TP Majumder, SK Roy

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    Abstract

    Results reported here on the spontaneous polarization, switching time, rotational viscosity and Goldstone mode dielectric strength and relaxation frequency as a function of electric field in the SmC* phase of a Ferroelectric liquid crystal mixture. It has been observed that the spontaneous polarization and the rotational viscosity are almost, independent of the amplitude of the applied field, The response time however depends on the applied field. The field required to unwound the helix is much larger than the structurally similar compounds. The dielectric strength of the Goldstone mode is found to decrease with the increase of bias electric field bur the relaxation frequency of the Goldstone mode on the other hand increases with the increase of bias electric field. Results also show that the critical field E-C, for unwinding the helical structure in SSMC* phase depends on the temperature. Rotational Viscosity of the Goldstone mode has also been determined under D.C bias field in the SmC* phase. Dielectric permittivity is found to increase with the increase of cell thickness. The increase of dielectric permittivity and the temperature of transition (T*(C)), in a thicker cell have also been explained considering theoretical relations developed earlier.
    LanguageEnglish
    Pages161-176
    JournalMolecular Crystals and Liquid Crystals
    Volume328
    Publication statusPublished - 1999

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    electro-optics
    liquid crystals
    permittivity
    electric fields
    viscosity
    polarization
    helices
    direct current
    temperature
    cells

    Cite this

    @article{c9887452a8d1419a9f465f513b81a267,
    title = "Electro-optic effect and influence of bias electric field on the goldstone mode dielectric behavior in smectic C* phase and cell thickness dependence of the dielectric permittivity of a ferroelectric liquid crystal mixture",
    abstract = "Results reported here on the spontaneous polarization, switching time, rotational viscosity and Goldstone mode dielectric strength and relaxation frequency as a function of electric field in the SmC* phase of a Ferroelectric liquid crystal mixture. It has been observed that the spontaneous polarization and the rotational viscosity are almost, independent of the amplitude of the applied field, The response time however depends on the applied field. The field required to unwound the helix is much larger than the structurally similar compounds. The dielectric strength of the Goldstone mode is found to decrease with the increase of bias electric field bur the relaxation frequency of the Goldstone mode on the other hand increases with the increase of bias electric field. Results also show that the critical field E-C, for unwinding the helical structure in SSMC* phase depends on the temperature. Rotational Viscosity of the Goldstone mode has also been determined under D.C bias field in the SmC* phase. Dielectric permittivity is found to increase with the increase of cell thickness. The increase of dielectric permittivity and the temperature of transition (T*(C)), in a thicker cell have also been explained considering theoretical relations developed earlier.",
    author = "SS Roy and S Kundu and N Ghosh and TP Majumder and SK Roy",
    note = "17th International Liquid Crystal Conference, STRASBOURG, FRANCE, JUL 19-24, 1998",
    year = "1999",
    language = "English",
    volume = "328",
    pages = "161--176",
    journal = "Molecular Crystals and Liquid Crystals",
    issn = "1542-1406",

    }

    TY - JOUR

    T1 - Electro-optic effect and influence of bias electric field on the goldstone mode dielectric behavior in smectic C* phase and cell thickness dependence of the dielectric permittivity of a ferroelectric liquid crystal mixture

    AU - Roy, SS

    AU - Kundu, S

    AU - Ghosh, N

    AU - Majumder, TP

    AU - Roy, SK

    N1 - 17th International Liquid Crystal Conference, STRASBOURG, FRANCE, JUL 19-24, 1998

    PY - 1999

    Y1 - 1999

    N2 - Results reported here on the spontaneous polarization, switching time, rotational viscosity and Goldstone mode dielectric strength and relaxation frequency as a function of electric field in the SmC* phase of a Ferroelectric liquid crystal mixture. It has been observed that the spontaneous polarization and the rotational viscosity are almost, independent of the amplitude of the applied field, The response time however depends on the applied field. The field required to unwound the helix is much larger than the structurally similar compounds. The dielectric strength of the Goldstone mode is found to decrease with the increase of bias electric field bur the relaxation frequency of the Goldstone mode on the other hand increases with the increase of bias electric field. Results also show that the critical field E-C, for unwinding the helical structure in SSMC* phase depends on the temperature. Rotational Viscosity of the Goldstone mode has also been determined under D.C bias field in the SmC* phase. Dielectric permittivity is found to increase with the increase of cell thickness. The increase of dielectric permittivity and the temperature of transition (T*(C)), in a thicker cell have also been explained considering theoretical relations developed earlier.

    AB - Results reported here on the spontaneous polarization, switching time, rotational viscosity and Goldstone mode dielectric strength and relaxation frequency as a function of electric field in the SmC* phase of a Ferroelectric liquid crystal mixture. It has been observed that the spontaneous polarization and the rotational viscosity are almost, independent of the amplitude of the applied field, The response time however depends on the applied field. The field required to unwound the helix is much larger than the structurally similar compounds. The dielectric strength of the Goldstone mode is found to decrease with the increase of bias electric field bur the relaxation frequency of the Goldstone mode on the other hand increases with the increase of bias electric field. Results also show that the critical field E-C, for unwinding the helical structure in SSMC* phase depends on the temperature. Rotational Viscosity of the Goldstone mode has also been determined under D.C bias field in the SmC* phase. Dielectric permittivity is found to increase with the increase of cell thickness. The increase of dielectric permittivity and the temperature of transition (T*(C)), in a thicker cell have also been explained considering theoretical relations developed earlier.

    M3 - Article

    VL - 328

    SP - 161

    EP - 176

    JO - Molecular Crystals and Liquid Crystals

    T2 - Molecular Crystals and Liquid Crystals

    JF - Molecular Crystals and Liquid Crystals

    SN - 1542-1406

    ER -