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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 25, n. 50 DEC 18 2013.
• Citações Web of Science: 3

Resumo

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)

• Processo FAPESP: 08/55023-7 - Nanofios semicondutores individuais e em redes: sintese e propriedades eletricas.
• Beneficiário: Mônica Alonso Cotta
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/58962-1 - Estudo de interfaces e distribuicao de dopante em mano-estruturas semicondutoras pela analise quantitativa de imagens de microscopia eletronica de resolucao atomica.
• Beneficiário: Luiz Henrique Galvao Tizei
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/05989-5 - E-MRS ICAM IUMRS 2011 Spring Meeting
• Beneficiário: Luiz Fernando Zagonel
• Modalidade de apoio: Auxílio à Pesquisa - Reunião - Exterior