Nonlinear carrier dynamics in silicon nano-waveguides

Autor(es)

Aldaya, I. ^[1] ; Gil-Molina, A. ^{[2, 1]} ; Pita, J. L. ^[2] ; Gabrielli, L. H. ^[2] ; Fragnito, H. L. ^{[1, 3]} ; Dainese, P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Gleb Wataghin Phys Inst, Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Sch Elect & Comp Engn, Campinas, SP - Brazil

^[3] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: OPTICA; v. 4, n. 10, p. 1219-1227, OCT 20 2017.
• Citações Web of Science: 12

Resumo

The understanding of free-carrier dynamics in silicon photonic nano-waveguides and micro-cavities is fundamental to several nonlinear optical phenomena. Through time-resolved pump and probe experiments, a complex and nonlinear carrier recombination dynamics is revealed. Our results show that the carrier lifetime varies as the recombination evolves, with faster decay rates at the initial stages (with lifetime of similar to 800 ps) and much slower lifetimes at later stages (up to similar to 300 ns). The large surface-to-volume ratio in nano-waveguides enables clear observation of the effect of carrier trapping, manifesting as a decay curve that is highly dependent on the initial carrier density. Further, we demonstrate faster recombination rates by operating at high carrier density. Our results, along with a theoretical framework based on trap-assisted recombination statistics applied to nano-waveguides, can impact the dynamics of several nonlinear nanophotonic devices in which free carriers play a critical role, and open further opportunities to enhance the performance of all-optical silicon-based devices. (C) 2017 Optical Society of America (AU)

• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Linha de fomento: Auxílio à Pesquisa - Programa SPEC
• Processo FAPESP: 15/11779-4 - Efeitos plasmônicos e não-lineares em grafeno acoplado a guias de onda ópticos
• Beneficiário: Christiano José Santiago de Matos
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/20180-3 - Processos de espalhamento de luz em microestruturas fotônicas
• Beneficiário: Paulo Clóvis Dainese Júnior
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 15/04113-0 - Não linearidades em guias de onda baseados em silício
• Beneficiário: Ivan Aritz Aldaya Garde
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado