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

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals./
Author:	Gao, Kun.
Description:	1 online resource (247 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.
Contained By:	Dissertation Abstracts International78-09B(E).
Subject:	Physics. -
Online resource:	click for full text (PQDT)
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. - 1 online resource (247 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369733099Subjects--Topical Terms:

564049
Physics.
Index Terms--Genre/Form:

554714
Electronic books.

Optical Simulation and Fabrication of Pancharatnam (Geometric) Phase Devices from Liquid Crystals.
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504 $a Includes bibliographical references
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