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.
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16 November 2015
Research Article|
November 17 2015
Azimuthally polarized cathodoluminescence from InP nanowires
B. J. M. Brenny;
B. J. M. Brenny
1Center for Nanophotonics,
FOM Institute AMOLF
, Science Park 104, 1098 XG Amsterdam, The Netherlands
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D. van Dam;
D. van Dam
2COBRA Research Institute,
Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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C. I. Osorio;
C. I. Osorio
1Center for Nanophotonics,
FOM Institute AMOLF
, Science Park 104, 1098 XG Amsterdam, The Netherlands
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J. Gómez Rivas;
J. Gómez Rivas
2COBRA Research Institute,
Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
3
FOM Institute DIFFER
, P.O. Box 6336, 5600 HH Eindhoven, The Netherlands
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a)
Electronic mail: polman@amolf.nl
Appl. Phys. Lett. 107, 201110 (2015)
Article history
Received:
September 09 2015
Accepted:
November 03 2015
Citation
B. J. M. Brenny, D. van Dam, C. I. Osorio, J. Gómez Rivas, A. Polman; Azimuthally polarized cathodoluminescence from InP nanowires. Appl. Phys. Lett. 16 November 2015; 107 (20): 201110. https://doi.org/10.1063/1.4935798
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