title: Mapping local charge recombination heterogeneity by multidimensional nanospectroscopic imaging.
abstract: As materials functionality becomes more dependent on local physical and electronic properties, the importance of optically probing matter with true nanoscale spatial resolution has increased. In this work, we mapped the influence of local trap states within individual nanowires on carrier recombination with deeply subwavelength resolution. This is achieved using multidimensional nanospectroscopic imaging based on a nano-optical device. Placed at the end of a scan probe, the device delivers optimal near-field properties, including highly efficient far-field to near-field coupling, ultralarge field enhancement, nearly background-free imaging, independence from sample requirements, and broadband operation. We performed ~40-nanometer-resolution hyperspectral imaging of indium phosphide nanowires via excitation and collection through the probes, revealing optoelectronic structure along individual nanowires that is not accessible with other methods.
authors.affiliation: Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Bao
authors.forename: M
authors.initials: M
authors.lastname: Melli
authors.forename: N
authors.initials: N
authors.lastname: Caselli
authors.forename: F
authors.initials: F
authors.lastname: Riboli
authors.forename: D S
authors.initials: DS
authors.lastname: Wiersma
authors.forename: M
authors.initials: M
authors.lastname: Staffaroni
authors.forename: H
authors.initials: H
authors.lastname: Choo
authors.forename: D F
authors.initials: DF
authors.lastname: Ogletree
authors.forename: S
authors.initials: S
authors.lastname: Aloni
authors.forename: J
authors.initials: J
authors.lastname: Bokor
authors.forename: S
authors.initials: S
authors.lastname: Cabrini
authors.forename: F
authors.initials: F
authors.lastname: Intonti
authors.forename: M B
authors.initials: MB
authors.lastname: Salmeron
authors.forename: E
authors.initials: E
authors.lastname: Yablonovitch
authors.forename: P J
authors.initials: PJ
authors.lastname: Schuck
authors.forename: A
authors.initials: A
authors.lastname: Weber-Bargioni