Novel orientation states transitions in liquid crystal induced by microtextured substrates

Kumar Rajesh, Hirotsugu Kikuchi, Tisato Kajiyama

Research output: Contribution to journalConference article

Abstract

Substrate induced alignment of liquid crystal is well established for electro-optical applications. In most of these cases it results in strong anchoring of liquid crystal, however, tuning of effective anchoring is well desired. Some of the photopolymers, under exposure to polarized UV light, induces the alignment in adjacent liquid crystals and offers the way to control the alignment on local basis. Here, we show a method of tuning the effective anchoring energy on patterned photopolymer with mixed alignment potential (resulting in planer and tilted orientation) of constant periodicity. The effective anchoring is weak and associated with first order transition of orientation state as a function of temperature. The phenomena observed here might be exploited for application purposes by local heating or by applying an electric field.

Original languageEnglish
Pages (from-to)1645-1650
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume330
Publication statusPublished - Dec 1 1999
EventProceedings of the 1998 17th International Liquid Crystal Conference - Strasbourg, France
Duration: Jul 19 1998Jul 24 1998

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Liquid Crystals
Crystal orientation
Liquid crystals
liquid crystals
alignment
Photopolymers
photopolymers
Substrates
Tuning
tuning
Ultraviolet radiation
periodic variations
Electric fields
Heating
heating
electric fields
Temperature
temperature
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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T1 - Novel orientation states transitions in liquid crystal induced by microtextured substrates

AU - Rajesh, Kumar

AU - Kikuchi, Hirotsugu

AU - Kajiyama, Tisato

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N2 - Substrate induced alignment of liquid crystal is well established for electro-optical applications. In most of these cases it results in strong anchoring of liquid crystal, however, tuning of effective anchoring is well desired. Some of the photopolymers, under exposure to polarized UV light, induces the alignment in adjacent liquid crystals and offers the way to control the alignment on local basis. Here, we show a method of tuning the effective anchoring energy on patterned photopolymer with mixed alignment potential (resulting in planer and tilted orientation) of constant periodicity. The effective anchoring is weak and associated with first order transition of orientation state as a function of temperature. The phenomena observed here might be exploited for application purposes by local heating or by applying an electric field.

AB - Substrate induced alignment of liquid crystal is well established for electro-optical applications. In most of these cases it results in strong anchoring of liquid crystal, however, tuning of effective anchoring is well desired. Some of the photopolymers, under exposure to polarized UV light, induces the alignment in adjacent liquid crystals and offers the way to control the alignment on local basis. Here, we show a method of tuning the effective anchoring energy on patterned photopolymer with mixed alignment potential (resulting in planer and tilted orientation) of constant periodicity. The effective anchoring is weak and associated with first order transition of orientation state as a function of temperature. The phenomena observed here might be exploited for application purposes by local heating or by applying an electric field.

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