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Application of PN-Heterojunctions in Photorefractive Liquid Crystal Light Valves

Idehenre, Ighodalo U.
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1555322037857119

Abstract Details

2019, Doctor of Philosophy (Ph.D.), University of Dayton, Electro-Optics.
This dissertation describes the first application, of Copper Oxide (Cu(II)O or CuO) and Zinc Oxide (ZnO) pn-junction thin films in photorefractive liquid crystal light valve applications. A novel thin film preparation technique was developed based on ball milling, spin coating, and thermal treatment that is able to produce optically transparent (>80% transmission in the visible) multilayer thin films of ZnO (~75 nm) and CuO (~6 nm). The electro-optic response of liquid crystal light valves prepared with CuO/ZnO pn-junction thin films was demonstrated using optical Freedericksz measurements and two-wave mixing. Results from the optical Freedericksz showed a forward and reverse bias response when the illumination intensity was varied, which was attributed to the photodiode behavior of the pn-junction. The results from the two-wave mixing experiment showed a photorefractive asymmetric energy exchange between two laser beam inputs of equal power. A new model was proposed to explain the origins of this asymmetric coupling response based on the anisotropy of the liquid crystal medium, the two input beam's polarization states, and k-vectors.
Dean Evans, PhD (Committee Chair)
Partha Banerjee, PhD (Committee Member)
Terrence Murray, PhD (Committee Member)
Andrew Sarangan, PhD (Committee Member)
159 p.
Electrical Engineering; Nanotechnology; Optics
Photorefractive; Photovoltaic; Liquid Crystal; Light Valve; ZnO; CuO; Zinc Oxide; Copper Oxide

Recommended Citations

Citations

  • Idehenre, I. U. (2019). Application of PN-Heterojunctions in Photorefractive Liquid Crystal Light Valves [Doctoral dissertation, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1555322037857119

    APA Style (7th edition)

  • Idehenre, Ighodalo. Application of PN-Heterojunctions in Photorefractive Liquid Crystal Light Valves. 2019. University of Dayton, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1555322037857119.

    MLA Style (8th edition)

  • Idehenre, Ighodalo. "Application of PN-Heterojunctions in Photorefractive Liquid Crystal Light Valves." Doctoral dissertation, University of Dayton, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1555322037857119

    Chicago Manual of Style (17th edition)

dayton1555322037857119
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© 2019, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.