- Title Information
- Title
- Photo-Patterning Studies for Liquid Crystal Alignment
- Name:
Personal
- Name Part
- Eakin, James Nelson
- Role
- Role Term:
Text
- creator
- Origin Information
- Copyright Date
(keyDate="yes", encoding="w3cdtf")
- 2008
- Physical Description
- Extent
- xxiv, 169 p.
- digitalOrigin
- born digital
- Note
- Thesis (Ph.D.) -- Brown University (2008)
- Name:
Personal
- Name Part
- Crawford, Gregory
- Role
- Role Term:
Text
- director
- Name:
Personal
- Name Part
- Hurt, Robert
- Role
- Role Term:
Text
- reader
- Name:
Personal
- Name Part
- Zaslavsky, Alexander
- Role
- Role Term:
Text
- reader
- Name:
Corporate
- Name Part
- Brown University. Division of Engineering. Electrical Sciences and Computer Engineering
- Role
- Role Term:
Text
- sponsor
- Genre (aat)
- theses
- Abstract
- This dissertation utilizes holographic exposure techniques to manipulate the periodic orientation of liquid crystal materials. Two different exposure techniques are investigated: a
polarization holography interference method incident on a photo-responsive surface to induce a preferential ordering, and an amplitude holography interference method that relies on a phase
separation and counter-diffusion reaction to create stratified regions of liquid crystal and polymer. In the phase holography investigations, a linear photopolymerizable (LPP) layer is
selectively polymerized permanently capturing phase information from the interference patterning and transferring it to align a liquid crystal material. The underlying periodic and frustrated
alignment in the one- and two-dimensional alignment configurations is discussed, including the nature of their electro-optic switching transitions. A phenomenological model is presented to
describe the Freedericksz transition, or lack thereof, for the registered planar-periodic boundary conditions resulting from the interference of two orthogonal circularly polarized beams. In the
amplitude holography investigations, the frustrated chiral and smectic ordering of ferroelectric liquid crystal domains encapsulated by a polymer binder were established. The refractive index
modulation in these thin films is modeled as a phase grating that can be electrically addressed to erase the optical diffractive properties. A phenomenological model is developed to take into
account a distribution of domain sizes and an effective field that stabilizes the ferroelectric liquid crystal domains. A diffraction model successfully predicts changes in normalized
intensities for first-order diffraction with applied field. These gratings demonstrate microsecond-scale response and relaxation times for various grating pitch sizes between 3 and 12
micrometers.
- Subject (Local)
- Topic
- alignment
- Subject (Local)
- Topic
- surface ordering
- Subject (FAST)
(authorityURI="http://id.worldcat.org/fast", valueURI="http://id.worldcat.org/fast/999541")
- Topic
- Liquid crystals
- Subject (FAST)
(authorityURI="http://id.worldcat.org/fast", valueURI="http://id.worldcat.org/fast/1070588")
- Topic
- Polymers
- Subject (FAST)
(authorityURI="http://id.worldcat.org/fast", valueURI="http://id.worldcat.org/fast/893514")
- Topic
- Diffraction
- Subject (FAST)
(authorityURI="http://id.worldcat.org/fast", valueURI="http://id.worldcat.org/fast/1046845")
- Topic
- Optics
- Record Information
- Record Content Source (marcorg)
- RPB
- Record Creation Date
(encoding="iso8601")
- 20091218
- Language
- Language Term:
Code (ISO639-2B)
- eng
- Language Term:
Text
- English
- Identifier:
DOI
- 10.7301/Z0P8496Z
- Access Condition:
rights statement
(href="http://rightsstatements.org/vocab/InC/1.0/")
- In Copyright
- Access Condition:
restriction on access
- Collection is open for research.
- Type of Resource (primo)
- dissertations