title: Tunable three-dimensional helically stacked plasmonic layers on nanosphere monolayers.
abstract: We report a simple and scalable method to fabricate helical chiral plasmonic nanostructures using glancing angle deposition on self-assembled nanosphere monolayers. By controlling the azimuthal rotation of substrates, Ag and SiO2 layers can be helically stacked in left-handed and right-handed fashions to form continuous helices. Finite-difference time-domain simulations confirm the experimental results that show that these plasmonic helices exhibit strong chiroptical responses in the visible to near-IR region, which can be tuned by changing the diameter of nanospheres. With such flexibility in the design, helically stacked plasmonic layers may act as tunable chiral metamaterials, as well as serve as different building blocks for chiral assemblies.
authors.affiliation: Department of Physics and Astronomy, and Nanoscale Science and Engineering Center, University of Georgia , Athens, Georgia 30602, United States.
authors.forename: Yizhuo
authors.initials: Y
authors.lastname: He
authors.forename: George K
authors.initials: GK
authors.lastname: Larsen
authors.forename: Whitney
authors.initials: W
authors.lastname: Ingram
authors.forename: Yiping
authors.initials: Y
authors.lastname: Zhao