title: Far-field imaging for direct visualization of light interferences in GaAs nanowires.
abstract: The optical and electrical characterization of nanostructures is crucial for all applications in nanophotonics. Particularly important is the knowledge of the optical near-field distribution for the design of future photonic devices. A common method to determine optical near-fields is scanning near-field optical microscopy (SNOM) which is slow and might distort the near-field. Here, we present a technique that permits sensing indirectly the infrared near-field in GaAs nanowires via its second-harmonic generated (SHG) signal utilizing a nonscanning far-field microscope. Using an incident light of 820 nm and the very short mean free path (16 nm) of the SHG signal in GaAs, we demonstrate a fast surface sensitive imaging technique without using a SNOM. We observe periodic intensity patterns in untapered and tapered GaAs nanowires that are attributed to the fundamental mode of a guided wave modulating the Mie-scattered incident light. The periodicity of the interferences permits to accurately determine the nanowires' radii by just using optical microscopy, i.e., without requiring electron microscopy.
authors.affiliation: Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany. rachel.grange@uni-jena.de
authors.forename: Rachel
authors.initials: R
authors.lastname: Grange
authors.forename: Gerald
authors.initials: G
authors.lastname: Brönstrup
authors.forename: Michael
authors.initials: M
authors.lastname: Kiometzis
authors.forename: Anton
authors.initials: A
authors.lastname: Sergeyev
authors.forename: Jessica
authors.initials: J
authors.lastname: Richter
authors.forename: Christian
authors.initials: C
authors.lastname: Leiterer
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Fritzsche
authors.forename: Christoph
authors.initials: C
authors.lastname: Gutsche
authors.forename: Andrey
authors.initials: A
authors.lastname: Lysov
authors.forename: Werner
authors.initials: W
authors.lastname: Prost
authors.forename: Franz-Josef
authors.initials: FJ
authors.lastname: Tegude
authors.forename: Thomas
authors.initials: T
authors.lastname: Pertsch
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann
authors.forename: Silke
authors.initials: S
authors.lastname: Christiansen