title: Reversible Control of Third-Order Optical Nonlinearity of DNA Decorated Carbon Nanotube Hybrids.
abstract: Positive and negative third-order optical nonlinearities have been investigated in single-stranded DNA wrapped semiconducting single-walled carbon nanotubes. It is found that the redox reactions of hydrogen peroxide can reverse the sign of the third-order nonlinearity. The observation proves that the lowest unoccupied molecular orbital has a lower density of electronic states than that of the highest occupied molecular orbital. A three-energy-level model is used to explain the effect of the redox reactions. Raman spectroscopy has also been used to investigate the interaction between single-walled carbon nanotubes and single-stranded DNA.
authors.affiliation: Arkansas Center for Laser Applications and Science, Department of Chemistry & Physics, Arkansas State University.
authors.forename: Liangmin
authors.initials: L
authors.lastname: Zhang
authors.forename: Jacquelyn
authors.initials: J
authors.lastname: Thomas
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Xu
authors.forename: Ben
authors.initials: B
authors.lastname: Rougeau
authors.forename: Michael
authors.initials: M
authors.lastname: Sullivan
authors.forename: Scott
authors.initials: S
authors.lastname: Reeve
authors.forename: Susan D
authors.initials: SD
authors.lastname: Allen
authors.forename: Fumiya
authors.initials: F
authors.lastname: Watanabe
authors.forename: Alexandru
authors.initials: A
authors.lastname: Biris
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao