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Type: Artigo
Title: Nonlinear carrier dynamics in silicon nano-waveguides
Author: Aldaya, I.
Gil-Molina, A.
Pita, J. L.
Gabrielli, L. H.
Fragnito, H. L.
Dainese, P.
Abstract: 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.
Subject: Guias de ondas
Ótica não-linear
Wave guides
Nonlinear optics
Country: Estados Unidos
Editor: Optical Society of America
Rights: fechado
Identifier DOI: 10.1364/OPTICA.4.001219
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos
FEEC - Artigos e Outros Documentos

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