Formation of Piled Circular Texture Induced by Alternating Electric Field   in Freely Suspended Ferroelectric Liquid Crystal Films

Uto, Sadahito; Tazoh, Eisuke; Yoshino, Katsumi

doi:10.1143/jjap.36.l1198

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…There have been several reports of target patterns with many rings in a thin film of SmC LC [16,17,18,19,20]. If we compare our results to those reports, the C-director of the SmC phase plays the role of the director of the nematic.…”

Section: Discussionsupporting

confidence: 63%

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Kojima

Yamamoto

Sadakane

et al. 2008

Chemical Physics Letters

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We found that multiple circular walls (MCW) can be generated on a thin film of a nematic liquid crystal through a spiral scanning of a focused IR laser. The ratios between the radii of adjacent rings of MCW were almost constant. These constant ratios can be explained theoretically by minimization of the Frank elastic free energy of nematic medium. The director field on a MCW exhibits chiral symmetry-breaking although the elastic free energies of both chiral MCWs are degenerated, i.e., the director on a MCW can rotate clockwise or counterclockwise along the radial direction.

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Section: Discussionsupporting

confidence: 63%

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Kojima

Yamamoto

Sadakane

et al. 2008

Chemical Physics Letters

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“…In our case, the spontaneous polarization is small, P -4 nC/cm2 in the temperature range of existence of the SmC' phase. The circular texture may also be obtained in sample with high spontaneous polarizations [2]. On catching the light intensity profile along an axis perpendicular to the disclination walls, we evidence modulation of the light intensity with unequal maximums.…”

Section: Introductionmentioning

confidence: 52%

“…Another way to produce striped texture with continuous rotation of c is to apply an ac electric field in the plane of the free standing film[2]. The resulting textures areDownloaded by [The University of Manchester Library] at 12:05 20 December 2014 BEND ELASTIC CONSTANT IN FFSF OF TILTED SMECTICS ... [2277]/425…”

mentioning

confidence: 99%

Bend Elastic Constant in Ferroelectric Free Standing Films of Tilted Smectics

Najjar

Galerne

2001

Molecular Crystals and Liquid Crystals Science and Technology.

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A texture of circular concentric disclination walls is produced in a smectic C* free standing film on applying an in-plane ac electric field. Intensity light profiles taken in the radial section of the circular walls allows us to evidence modulations of the tilt of the molecules. These molecular tilt angle modulations are due to , a new elastic term K*c2(rotc).N in the free energy. We deduce the linear bend constant K , which originate from the chiral property of the system. We find K*/b -2.5 pm.

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“…[1][2][3][4] This film is not influenced by substrate potentials and provides the unique possibility of studying the influence of reduced dimensionality on various physical properties of confined ordered liquids. [5][6][7] In addition, it is sensitive to the external field and can be easily deformed upon application of external stress such as the acoustic vibration of air. 8 Application of electric field can induce mechanical vibration in the FSF.…”

Section: Introductionmentioning

confidence: 99%

Electro-optical response of reflected light from freely suspended smectic liquid-crystal films

Nakano

Yoshino

2002

Journal of Applied Physics

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We have studied the electro-optical response of reflected light from the surface of freely suspended liquid-crystal films ͑FSFs͒ in SmA, SmC*, and SmC A * phases. Upon application of an electric field parallel to FSFs, the film vibrational spectrum generally contains a second-harmonic component of the applied frequency. In the SmA phase, only a second-harmonic component appeared in the fast Fourier transform ͑FFT͒ spectra of the reflected light. In the SmC* phase, however, many other components also appeared in the FFT spectra of the reflected light. These complicated characteristics observed in the ferroelectric phase might be attributed to the contribution of the transient scattering mode. On the other hand, in the SmC A * phase, only the second-harmonic component appeared, similar to the case of the SmA phase. In the electric field high enough to cause an antiferroelectric-ferroelectric phase transition, however, many other components appear in the spectrum, in the same manner as that in the SmC* phase.

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Formation of Piled Circular Texture Induced by Alternating Electric Field in Freely Suspended Ferroelectric Liquid Crystal Films

Abstract: Unique piled circular textures induced by an alternating electric field have been observed in a freely suspended ferroelectric liquid crystal film using a polarizing microscope. Molecular alignments in the textures are clarified and the formation process of the texture is discussed.

Cited by 9 publications

References 12 publications

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Bend Elastic Constant in Ferroelectric Free Standing Films of Tilted Smectics

Electro-optical response of reflected light from freely suspended smectic liquid-crystal films

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