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Structured liquid crystal/polymer co...

Escuti, Michael James.

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Structured liquid crystal/polymer composites as photonic crystal switches and LCD innovations.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structured liquid crystal/polymer composites as photonic crystal switches and LCD innovations./
Author:	Escuti, Michael James.
Description:	183 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1783.
Contained By:	Dissertation Abstracts International64-04B.
Subject:	Physics, Optics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087254
ISBN:	0496350242

Structured liquid crystal/polymer composites as photonic crystal switches and LCD innovations.
Escuti, Michael James.

Structured liquid crystal/polymer composites as photonic crystal switches and LCD innovations. - 183 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1783.

Thesis (Ph.D.)--Brown University, 2003.

Mesoscale two- and three-dimensional lattices are formed in polymer-dispersed liquid crystal (PDLC) materials using one-step holographic fabrication. Discrete nematic liquid crystal (LC) domains are patterned within a rigid polymer binder (a multifunctional urethane acrylate) through an irradiance-driven diffusion and phase separation process, and are essentially low index-contrast photonic crystals whose index-modulation closely mimics the irradiance profile applied during formation. Electromagnetic fields are used to align the nematic configurations within the LC domains, allowing electrical control of the coherent scattering from these lattices.

ISBN: 0496350242Subjects--Topical Terms:

1018756
Physics, Optics.

Structured liquid crystal/polymer composites as photonic crystal switches and LCD innovations.
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020 $a 0496350242
035 $a (UnM)AAI3087254
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100 1 $a Escuti, Michael James. $3 1937606
245 1 0 $a Structured liquid crystal/polymer composites as photonic crystal switches and LCD innovations.
300 $a 183 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1783.
500 $a Adviser: Gregory P. Crawford.
502 $a Thesis (Ph.D.)--Brown University, 2003.
520 $a Mesoscale two- and three-dimensional lattices are formed in polymer-dispersed liquid crystal (PDLC) materials using one-step holographic fabrication. Discrete nematic liquid crystal (LC) domains are patterned within a rigid polymer binder (a multifunctional urethane acrylate) through an irradiance-driven diffusion and phase separation process, and are essentially low index-contrast photonic crystals whose index-modulation closely mimics the irradiance profile applied during formation. Electromagnetic fields are used to align the nematic configurations within the LC domains, allowing electrical control of the coherent scattering from these lattices.
520 $a Planar films of square, face-centered-cubic (FCC), hexagonal-close-packed (HCP), and simple-hexagonal lattices formed by four- and six-beam holography are characterized through scanning electron microscopy and various electro/thermo-optic techniques. Observed electro-optic effects relevant to photonic switching and liquid crystal display (LCD) applications include a strongly polarized Bragg reflection, an in-plane optical anisotropy, a wavelength-tunable stopband, and low-threshold switching. These holographic techniques enable the regular confinement of LC in spherical, ellipsoidal, and cylindrical cavities at lattice nodes with dimensions previously unattainable (50&sim;200 nm), allowing the physics of alignment and ordering at this scale to be fully understood.
520 $a In addition, a significant improvement in the dynamic response time of the In-Plane-Switching mode LCD is achieved through the introduction of a low-density, stabilizing polymer network that causes the nematic director to favor the zero-field orientation. The effect of polymer concentration on the electro-optical performance of the polymer-stabilized IPS mode cells is characterized through experiment, and a simple elastic-continuum model that treats the polymer network as an effective field is presented.
590 $a School code: 0024.
650 4 $a Physics, Optics. $3 1018756
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Chemistry, Polymer. $3 1018428
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690 $a 0611
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710 2 0 $a Brown University. $3 766761
773 0 $t Dissertation Abstracts International $g 64-04B.
790 1 0 $a Crawford, Gregory P., $e advisor
790 $a 0024
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3087254