Electro-absorption measurements and optical nonlinearities of DCH polydiacetylene

Persistent Link:
http://hdl.handle.net/10150/277976
Title:
Electro-absorption measurements and optical nonlinearities of DCH polydiacetylene
Author:
Jarka, Frederick William, 1961-
Issue Date:
1991
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Theoretical calculations have predicted the importance of two-photon absorptions in the third order optical nonlinearities of polydiacetylenes. We have used electro-absorption techniques to make these two-photon transitions slightly one-photon allowed and therefore observable in the one-photon absorption spectrum. Our findings, although unable to ascertain the existence of below-gap two-photon states, nevertheless provide an unexpected view of the conduction band in conjugated chain polymers. The observation of a field induced oscillatory change in the absorption around the vicinity of the band edge and comparison of this signal with theoretical calculations leads to the conclusion that the conduction band is composed of both one-photon and two-photon states. This oscillatory signal cannot be solely explained by one-photon or two-photon states but must include both types for this high energy signal to be reproduced in the theoretical calculations.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Chemistry, Polymer.; Physics, Condensed Matter.; Physics, Optics.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Peyghambarian, Nasser

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleElectro-absorption measurements and optical nonlinearities of DCH polydiacetyleneen_US
dc.creatorJarka, Frederick William, 1961-en_US
dc.contributor.authorJarka, Frederick William, 1961-en_US
dc.date.issued1991en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractTheoretical calculations have predicted the importance of two-photon absorptions in the third order optical nonlinearities of polydiacetylenes. We have used electro-absorption techniques to make these two-photon transitions slightly one-photon allowed and therefore observable in the one-photon absorption spectrum. Our findings, although unable to ascertain the existence of below-gap two-photon states, nevertheless provide an unexpected view of the conduction band in conjugated chain polymers. The observation of a field induced oscillatory change in the absorption around the vicinity of the band edge and comparison of this signal with theoretical calculations leads to the conclusion that the conduction band is composed of both one-photon and two-photon states. This oscillatory signal cannot be solely explained by one-photon or two-photon states but must include both types for this high energy signal to be reproduced in the theoretical calculations.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectChemistry, Polymer.en_US
dc.subjectPhysics, Condensed Matter.en_US
dc.subjectPhysics, Optics.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorPeyghambarian, Nasseren_US
dc.identifier.proquest1345616en_US
dc.identifier.bibrecord.b27056107en_US
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