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Broadening of Bragg Reflection of Polymer Stabilized Cholesteric Liquid Crystals with Small Cell Gap Induced by Low DC Voltage

Chen, Dengcheng
http://rave.ohiolink.edu/etdc/view?acc_num=kent163726935589553

Abstract Details

2021, MS, Kent State University, College of Arts and Sciences / Materials Science Graduate Program.
The classical X-Y rotor model is used for demonstrating the temperature dependence of pitch of Cholesteric Liquid Crystals. Polymer Stabilized Cholesteric Liquid Crystals prepared from Nematic Liquid Crystals with a large birefringence (∆n) and an absolute value of dielectric anisotropy(∆ε) are used to achieve the whole-visible-spectrum bandgap symmetric broadening by 54V DC voltage (cell gap: 18.2 μm). The samples with DC voltage in the curing process gain a permanent wider bandgap. The bandgap of Polymer Stabilized Cholesteric Liquid Crystal doped with Direct Yellow 4 dye is found to have a bandgap of 230nm under only 27V DC voltage. POM images are used for demonstrating the focal-conic state in samples destroyed by overloading.
Liang -Chy Chien (Committee Chair)
Robin Selinger (Committee Member)
Antal Jákli (Committee Member)
65 p.
Materials Science; Optics; Physics
Liquid Crystal, Cholesteric, Chiral Nematic, X-Y model, Pitch, Bandwidth, Broaden of Photonic Band Gap

Recommended Citations

Citations

  • Chen, D. (2021). Broadening of Bragg Reflection of Polymer Stabilized Cholesteric Liquid Crystals with Small Cell Gap Induced by Low DC Voltage [Master's thesis, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent163726935589553

    APA Style (7th edition)

  • Chen, Dengcheng. Broadening of Bragg Reflection of Polymer Stabilized Cholesteric Liquid Crystals with Small Cell Gap Induced by Low DC Voltage. 2021. Kent State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent163726935589553.

    MLA Style (8th edition)

  • Chen, Dengcheng. "Broadening of Bragg Reflection of Polymer Stabilized Cholesteric Liquid Crystals with Small Cell Gap Induced by Low DC Voltage." Master's thesis, Kent State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent163726935589553

    Chicago Manual of Style (17th edition)

kent163726935589553
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© 2021, all rights reserved.
This open access ETD is published by Kent State University and OhioLINK.