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Optical Simulation and Fabrication o...

Gao, Kun.

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Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals./
Author:	Gao, Kun.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	247 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.
Contained By:	Dissertation Abstracts International78-09B(E).
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10592328
ISBN:	9781369733099

Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals.
Gao, Kun.

Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 247 p.

Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.

Thesis (Ph.D.)--Kent State University, 2017.

Pancharatnam made clear the concept of a phase-only device based on changes in the polarization state of light. A device of this type is sometimes called a circular polarization grating because of the polarization states of interfering light beams used to fabricate it by polarization holography. Here, we will call it a Pancharatnam (geometric) phase device to emphasize the fact that the phase of diffracted light does not have a discontinuous periodic profile but changes continuously. In this dissertation, using simulations and experiments, we have successfully demonstrated a 90% diffraction efficiency based on the Pancharatnam phase deflector (PPD) with the dual-twist structure. Unlike the conventional Pancharatnam phase deflector (c-PPD) limited to small diffraction angles, our work demonstrates that a device with a structural periodicity near the wavelength of light is highly efficient at deflecting light to large angles. Also, from a similar fabrication procedure, we have made an ultra-compact non-mechanical zoom lens system based on the Pancharatnam phase lens (PPL) with a low f-number and high efficiency. The wavelength dependence on the image quality is evaluated and shown to be satisfactory from red light to near-infrared machine vision systems. A demonstration device is shown with a 4x zoom ratio at a 633 nm wavelength. The unique characteristic of these devices is made possible through the use of azo-dye photoalignment materials to align a liquid crystal polymer (reactive mesogens). Furthermore, the proposed dual-twist design and fabrication opens the possibility for making a high-efficiency beam-steering device, a lens with an f-number less than 1.0, as well as a wide range of other potential applications in the optical and display industry. The details of simulation, fabrication, and characterization of these devices are shown in this dissertation.

ISBN: 9781369733099Subjects--Topical Terms:

516296
Physics.

Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals.
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