Development of New Azobenzene Photo-Alignment Molecules on Controlling the Tilt Angle of Liquid Crystals
Abstract
Cholesteric liquid crystals (CLCs) showing selective reflection (maximum reflection greater than or equal to 50 percent)of light, which can applied to optical fibers, light shutters, smart windows and display havebeen of great interest. To control reflection band, bandwidth broadening and switching response of dynamic electro-optical (EO) responsible polymer-stabilized CLCs (PSCLC) at different oblique incidence angles were reported. At the large oblique angle (greater than 50 degree), a single PSCLC cell exhibited very high optical density (greater than 99 percent reflection) and even high out of-band transmission. However, to be used as an optical device, a large prism having an angle of 60 degree or more must be used, that becomes a big hurdle to overcome. Instead of using an oblique angle incidence (prism method), an alternative approach is to tilt the helical axis of CLC across the cell thickness.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 20, 2022
- Source ID
- FA23861914008
Entities
People
- Kwang-Un Jeong
Organizations
- Air Force Office of Scientific Research
- Jeonbuk National University
- United States Air Force