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Nonlinear Optical Responses of Blue-phase Liquid Crystals and Their Applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Nonlinear Optical Responses of Blue-phase Liquid Crystals and Their Applications./
作者:	Ho, Tsung-Jui.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	115 p.
附註:	Source: Dissertation Abstracts International, Volume: 80-08(E), Section: B.
Contained By:	Dissertation Abstracts International80-08B(E).
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13871831
ISBN:	9781392039243

Nonlinear Optical Responses of Blue-phase Liquid Crystals and Their Applications.
Ho, Tsung-Jui.

Nonlinear Optical Responses of Blue-phase Liquid Crystals and Their Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 115 p.

Source: Dissertation Abstracts International, Volume: 80-08(E), Section: B.

Thesis (Ph.D.)--The Pennsylvania State University, 2018.

"Are they called 'blue phases' because they are in blue color?" This is the most common question asked by many people. The answer is yes but no. The name was given by the scientist who first observed the special liquid crystalline phase reflecting the color blue, however, the reflection color does not represent the phases. The major difference of blue-phase liquid crystal from other phases is their self-assembly three-dimensional photonic crystalline structure with a lattice constant typically around hundreds of nanometers, and their ability to show Bragg reflection over the visible spectrum.

ISBN: 9781392039243Subjects--Topical Terms:

596380
Electrical engineering.

Nonlinear Optical Responses of Blue-phase Liquid Crystals and Their Applications.
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300 $a 115 p.
500 $a Source: Dissertation Abstracts International, Volume: 80-08(E), Section: B.
500 $a Adviser: Iam-Choon Khou.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2018.
520 $a "Are they called 'blue phases' because they are in blue color?" This is the most common question asked by many people. The answer is yes but no. The name was given by the scientist who first observed the special liquid crystalline phase reflecting the color blue, however, the reflection color does not represent the phases. The major difference of blue-phase liquid crystal from other phases is their self-assembly three-dimensional photonic crystalline structure with a lattice constant typically around hundreds of nanometers, and their ability to show Bragg reflection over the visible spectrum.
520 $a At first, blue-phases were not popular because they are optically isotropic, i.e. no birefringence. However, they attracted wide attention over academic or industrial studies owing to their unique optical properties, such as a fast response time, being polarization-free, possessing no restriction on thickness, and having a self-assembly 3-D structure. Nowadays, scientists in chemistry are able to expand the temperature range from 1 K to almost 100 K and cover the room temperature. Therefore, blue phase are shown to be a promising material to overcome the disadvantage of typical liquid crystal materials.
520 $a In this dissertation, I will present a comprehensive study of nonlinear optical properties in blue-phase liquid crystal as well as their applications. First, ultrafast optical response of BPLC will be introduced. The results showed that pure transparent BPLC is capable of significantly attenuating a picosecond laser pulse with very high intensity. The mechanism is Maxwell stress-induced flow-reorientation effect. Owing to its tightly bounded structure, BPLC is a promising material for optical switching or optical limiter devices.
520 $a Furthermore, a detailed study of all-optical image processing with dye-doped BPLC will be revealed. Unlike typical nematic liquid crystals, blue phases are not restricted to sample thickness, and, therefore, Bragg grating condition can be applied to BPLC. The results showed that the diffraction efficiency of BPLC under holographic setup can provide results nearly one hundred times greater than that of the case with nematic liquid crystal. The high diffraction efficiency makes BPLC capable of many different applications, such as hologram reconstruction, phase conjugation, or photorefractive effect. Moreover, an interesting and simple way to prolong the grating memory is discovered, and the detail dynamical studies are shown in the dissertation.
590 $a School code: 0176.
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791 $a Ph.D.
792 $a 2018
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