Azimuthally polarized cathodoluminescence from InP nanowires

Journal Article · Mon Nov 16 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4935798· OSTI ID:22486076

Brenny, B. J. M.; Osorio, C. I.; Dam, D. van ^[1]; Gómez Rivas, J. ^[1]

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1. COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)

We determine the angle and polarization dependent emission from 1.75 µm and 2.50 µm long InP nanowires by using cathodoluminescence polarimetry. We excite the vertical wires using a 5 keV electron beam, and find that the 880 nm bandgap emission shows azimuthally polarized rings, with the number of rings depending on the wire height. The data agree well with a model in which spontaneous emission from the wire emitted into the far field interferes with emission reflected off the substrate. From the model, the depth range from which the emission is generated is found to be up to 400 nm below the top surface of the wires, well beyond the extent of the primary electron cloud. This enables a probe of the carrier diffusion length in the InP nanowires.

• OSTI ID: 22486076
• Journal Information: Applied Physics Letters, Vol. 107, Issue 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARRIERS
CATHODOLUMINESCENCE
DIFFUSION LENGTH
ELECTRON BEAMS
INDIUM PHOSPHIDES
KEV RANGE 01-10
NANOWIRES
POLARIMETRY
POLARIZATION
SUBSTRATES
SURFACES