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THE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING
GEORGIA INSTITUTE OF TECHNOLOGY
Under the provisions of the regulations for the degree
MASTER OF SCIENCE
on Tuesday, April 30, 2019
10:00 AM
in MOSE 2100F
will be held the
MASTER’S THESIS DEFENSE
for
Shengtao Yu
“Integration of Optical Structures with Chiral Nanocellulose Films”
Committee Members:
Prof. Vladimir V. Tsukruk, Advisor, MSE
Prof. Zhiqun Lin, MSE
Prof. Wenshan Cai, ECE/MSE
Abstract:
Generation of circular polarized (CP) light via cellulose nanocrystals (CNC) has demonstrated great potential for next generation of chiroptical materials, thanks to the abundance, cost-effective preparation, as well as the retained chiral liquid crystal ordering in solid form. To enhance the chiroptical properties of CNC film, a convenient strategy capable of integrating both diffractive and refractive optical structures is developed based on top-down lithographic techniques and bottom-up evaporation-induced self-assembly. The feasibility of such strategy is proved by a few optical structures including photonic gratings, photonic crystals and micro-lenses. The successful integration of these extrinsic structures with intrinsic chiral structure of CNC is evidenced by preservation of helical stacking structure of CNC as well as a good registration of features size down to sub-micron level with uniformity across large area on the film surface. As a result, a combination of more accurate and sharper structural color, light focusing capability as well as enhanced circular dichroism is observed, indicating great potential in advanced optical systems based-on CP light.
