Azimuthally polarized cathodoluminescence from InP nanowires

B.J.M. Brenny, D. van Dam, C.I. Osorio, J. Gómez Rivas, A. Polman

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We determine the angle and polarization dependent emission from 1.75 µm and 2.50 µm long InPnanowires by using cathodoluminescencepolarimetry. 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 InPnanowires.
Original languageEnglish
Article number201110
Pages (from-to)1-4
JournalApplied Physics Letters
Issue number20
Publication statusPublished - 16 Nov 2015


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