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

被引：4

作者：

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
]}

机构：

[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

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 50期

基金：

巴西圣保罗研究基金会;

关键词：

SEMICONDUCTOR NANOWIRES;

D O I：

10.1088/0953-8984/25/50/505303

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页数：6

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