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Title: Far field emission profile of pure wurtzite InP nanowires

We report on the far field emission profile of pure wurtzite InP nanowires in comparison to InP nanowires with predominantly zincblende crystal structure. The emission profile is measured on individual nanowires using Fourier microscopy. The most intense photoluminescence of wurtzite nanowires is collected at small angles with respect to the nanowire growth axis. In contrast, zincblende nanowires present a minimum of the collected light intensity in the direction of the nanowire growth. Results are explained by the orientation of electric dipoles responsible for the photoluminescence, which is different from wurtzite to zincblende. Wurtzite nanowires have dipoles oriented perpendicular to the nanowire growth direction, whereas zincblende nanowires have dipoles oriented along the nanowire axis. This interpretation is confirmed by both numerical simulations and polarization dependent photoluminescence spectroscopy. Knowledge of the dipole orientation in nanostructures is crucial for developing a wide range of photonic devices such as light-emitting diodes, photodetectors, and solar cells.
Authors:
; ;  [1] ; ; ;  [2]
  1. Kavli Institute of Nanoscience, Delft University of Technology, Delft (Netherlands)
  2. National Research Council, Ottawa, Ontario, K1A 0R6 (Canada)
Publication Date:
OSTI Identifier:
22391930
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; CRYSTAL STRUCTURE; ELECTRIC DIPOLES; FIELD EMISSION; INDIUM PHOSPHIDES; LIGHT EMITTING DIODES; MICROSCOPY; NANOWIRES; ORIENTATION; PHOTODETECTORS; PHOTOLUMINESCENCE; POLARIZATION; SOLAR CELLS; SPECTROSCOPY; ZINC SULFIDES