國立虎尾科技大學 |

High-speed Imaging of Spatiotemporal Liquid Crystal Switching Dynamics.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	High-speed Imaging of Spatiotemporal Liquid Crystal Switching Dynamics./
Author:	Jin, Yang.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	62 p.
Notes:	Source: Masters Abstracts International, Volume: 76-12.
Contained By:	Masters Abstracts International76-12.
Subject:	Engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1589463
ISBN:	9781321770964

High-speed Imaging of Spatiotemporal Liquid Crystal Switching Dynamics.
Jin, Yang.

High-speed Imaging of Spatiotemporal Liquid Crystal Switching Dynamics. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 62 p.

Source: Masters Abstracts International, Volume: 76-12.

Thesis (M.S.)--Tufts University, 2015.

This item must not be sold to any third party vendors.

Liquid crystals (LCs) are widely used for light modulation in industrial and commercial applications including device display technologies and optical switches for telecommunications. The elongation of LC molecules and their alignment to applied electric fields confers their unique electro-optical properties. However, their temporal response or `switching speed' due to an applied electric field is the primary limitation governing the overall performance of LC devices. To engineer better LC materials and faster devices, detailed knowledge of complex electrodynamic phenomena in LCs is required, yet no diagnostic methods are currently available to characterize fast temporal dynamics with high spatial resolution. In an effort to mediate this gap between instrumentation and LC physics, we have developed a technique based on high-speed imaging and polarization microscopy, which is used to characterize the spatiotemporal dynamics of LC switching on millisecond time scales with micron spatial resolution. To demonstrate the efficacy of this high-speed imaging method, we characterize the switching time scale for a standard Freedericksz cell as a function of the applied voltage. As a second industrially-relevant LC device geometry, we microfabricated an in-plane switching device that generates a highly non-uniform electric field, enabling us to measure spatial variations in switching speed within a single micro-scale device. Experimental results were compared with theoretical models to benchmark results, and also to quantitatively determine the LC switching dynamics from processed digital high-speed videos.

ISBN: 9781321770964Subjects--Topical Terms:

561152
Engineering.
Subjects--Index Terms:

High-speed imaging

High-speed Imaging of Spatiotemporal Liquid Crystal Switching Dynamics.
LDR:02873nam a2200409 4500 001 1104557
005 20230619080048.5
006 m o d
007 cr#unu||||||||
008 230907s2015 ||||||||||||||||| ||eng d
020 $a 9781321770964
035 $a (MiAaPQ)AAI1589463
035 $a (MiAaPQ)tuftsase:11525
035 $a AAI1589463
040 $a MiAaPQ $c MiAaPQ
100 1 $a Jin, Yang. $3 1413404
245 1 0 $a High-speed Imaging of Spatiotemporal Liquid Crystal Switching Dynamics.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2015
300 $a 62 p.
500 $a Source: Masters Abstracts International, Volume: 76-12.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Guasto, Jeffrey S.
502 $a Thesis (M.S.)--Tufts University, 2015.
506 $a This item must not be sold to any third party vendors.
520 $a Liquid crystals (LCs) are widely used for light modulation in industrial and commercial applications including device display technologies and optical switches for telecommunications. The elongation of LC molecules and their alignment to applied electric fields confers their unique electro-optical properties. However, their temporal response or `switching speed' due to an applied electric field is the primary limitation governing the overall performance of LC devices. To engineer better LC materials and faster devices, detailed knowledge of complex electrodynamic phenomena in LCs is required, yet no diagnostic methods are currently available to characterize fast temporal dynamics with high spatial resolution. In an effort to mediate this gap between instrumentation and LC physics, we have developed a technique based on high-speed imaging and polarization microscopy, which is used to characterize the spatiotemporal dynamics of LC switching on millisecond time scales with micron spatial resolution. To demonstrate the efficacy of this high-speed imaging method, we characterize the switching time scale for a standard Freedericksz cell as a function of the applied voltage. As a second industrially-relevant LC device geometry, we microfabricated an in-plane switching device that generates a highly non-uniform electric field, enabling us to measure spatial variations in switching speed within a single micro-scale device. Experimental results were compared with theoretical models to benchmark results, and also to quantitatively determine the LC switching dynamics from processed digital high-speed videos.
590 $a School code: 0234.
650 4 $a Engineering. $3 561152
650 4 $a Materials science. $3 557839
653 $a High-speed imaging
653 $a Liquid crystal
653 $a Response time
653 $a Spatiotemporal
653 $a Switching dynamics
690 $a 0537
690 $a 0794
710 2 $a Tufts University. $b Mechanical Engineering. $3 1184896
773 0 $t Masters Abstracts International $g 76-12.
790 $a 0234
791 $a M.S.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1589463