title: Visualizing the local optical response of semiconducting carbon nanotubes to DNA-wrapping.
abstract: We studied the local optical response of semiconducting single-walled carbon nanotubes to wrapping by DNA segments using high resolution tip-enhanced near-field microscopy. Photoluminescence (PL) near-field images of single nanotubes reveal large DNA-wrapping-induced red shifts of the exciton energy that are two times higher than indicated by spatially averaging confocal microscopy. Near-field PL spectra taken along nanotubes feature two distinct PL bands resulting from DNA-wrapped and unwrapped nanotube segments. The transition between the two energy levels occurs on a length scale smaller than our spatial resolution of about 15 nm.
authors.affiliation: Department Chemie and Biochemie and CeNS, Ludwig-Maximilians-Universitat Munchen, 81377 Munchen, Germany.
authors.forename: Huihong
authors.initials: H
authors.lastname: Qian
authors.forename: Paulo T
authors.initials: PT
authors.lastname: Araujo
authors.forename: Carsten
authors.initials: C
authors.lastname: Georgi
authors.forename: Tobias
authors.initials: T
authors.lastname: Gokus
authors.forename: Nicolai
authors.initials: N
authors.lastname: Hartmann
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Green
authors.forename: Ado
authors.initials: A
authors.lastname: Jorio
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hersam
authors.forename: Lukas
authors.initials: L
authors.lastname: Novotny
authors.forename: Achim
authors.initials: A
authors.lastname: Hartschuh
mesh_terms: D004247:DNA / Q000737:chemistry*; D037742:Nanotubes, Carbon; D012666:Semiconductors
chemical_list: D037742:Nanotubes, Carbon; D004247:DNA