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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spatial modulation of above-the-gap cathodoluminescence in InP nanowires

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Tizei, L. H. G. [1, 2] ; Zagonel, L. F. [1] ; Tence, M. [2] ; Stephan, O. [2] ; Kociak, M. [2] ; Chiaramonte, T. [3] ; Ugarte, D. [1] ; Cotta, M. A. [1]
Total Authors: 8
[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[2] Univ Paris 11, CNRS, UMR 8502, Phys Solides Lab, F-91405 Orsay - France
[3] Univ Fed Sao Joao del Rei UFSJ, BR-36301160 Sao Joao Del Rei, MG - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 25, n. 50 DEC 18 2013.
Web of Science Citations: 3

We report the observation of light emission on wurtzite InP nanowires excited by fast electrons. The experiments were performed in a scanning transmission electron microscope using an in-house-built cathodoluminescence detector. Besides the exciton emission, at 850 nm, emission above the band gap from 400 to 800 nm was observed. In particular, this broad emission presented systematic periodic modulations indicating variations in the local excitation probability. The physical origin of the detected emission is not clear. Measurements of the spatial variation of the above-the-gap emission points to the formation of leaky cavity modes of a plasmonic nature along the nanowire length, indicating the wave nature of the excitation. We propose a phenomenological model, which fits closely the observed spatial variations. (AU)

FAPESP's process: 11/05989-5 - E-MRS ICAM IUMRS 2011 Spring Meeting
Grantee:Luiz Fernando Zagonel
Support type: Research Grants - Meeting - Abroad