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

Identifieur interne : 000515 ( Main/Repository ); précédent : 000514; suivant : 000516

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

Auteurs : RBID : Pascal:14-0017097

Descripteurs français

Pascal (Inist)
- Plasmon surface, Cathodoluminescence, Etat excité, Microscopie électronique balayage transmission, Exciton, Modèle phénoménologique, Phosphure d'indium, Nanofil, InP.

English descriptors

KwdEn :
- Cathodoluminescence, Excited states, Excitons, Indium phosphide, Nanowires, Phenomenological model, Scanning transmission electron microscopy, Surface plasmons.

Abstract

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.

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Pascal:14-0017097

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<author><name sortKey="Tizei, L H G" uniqKey="Tizei L">L. H. G. Tizei</name>
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<affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Laboratoire de Physique des Solides, Université Paris-Sud, CNRS-UMR 8502</s1>
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<orgName type="university">Université Paris-Sud</orgName>
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<author><name sortKey="Zagonel, L F" uniqKey="Zagonel L">L. F. Zagonel</name>
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<author><name sortKey="Tence, M" uniqKey="Tence M">M. Tence</name>
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<author><name sortKey="Stephan, O" uniqKey="Stephan O">O. Stephan</name>
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<author><name sortKey="Kociak, M" uniqKey="Kociak M">M. Kociak</name>
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<author><name sortKey="Chiaramonte, T" uniqKey="Chiaramonte T">T. Chiaramonte</name>
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<author><name sortKey="Ugarte, D" uniqKey="Ugarte D">D. Ugarte</name>
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<front><div type="abstract" xml:lang="en">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.</div>
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Spatial modulation of above-the-gap cathodoluminescence in InP nanowires

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

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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