title: Fast detection of the metallic state of individual single-walled carbon nanotubes using a transient-absorption optical microscope.
abstract: In spite of the outstanding properties of single-walled carbon nanotubes (SWNTs), the coexistence of metallic and semiconducting SWNTs as a result of synthesis has hindered their electronic and photonic applications. We demonstrate a pump-probe microscopy method for fast, contact-free mapping of metallicity in individual SWNTs. We employ the phase of transient absorption as a contrast to discriminate metallic and semiconducting SWNTs. Furthermore, we have clarified the phase dependence on the pump or probe wavelengths and the energy structure of SWNTs. Our imaging method holds the potential of serving as a high-speed metallicity-mapping tool to assist the development of SWNT-based nanoelectronics.
authors.affiliation: Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Yookyung
authors.initials: Y
authors.lastname: Jung
authors.forename: Mikhail N
authors.initials: MN
authors.lastname: Slipchenko
authors.forename: Chang Hua
authors.initials: CH
authors.lastname: Liu
authors.forename: Alexander E
authors.initials: AE
authors.lastname: Ribbe
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Zhong
authors.forename: Chen
authors.initials: C
authors.lastname: Yang
authors.forename: Ji-Xin
authors.initials: JX
authors.lastname: Cheng
mesh_terms: D000042:Absorption; D008670:Metals / Q000737:chemistry*; D008853:Microscopy / Q000295:instrumentation*; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055620:Optical Phenomena; D012666:Semiconductors
chemical_list: D008670:Metals; D037742:Nanotubes, Carbon