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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nonlinear carrier dynamics in silicon nano-waveguides

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Author(s):
Aldaya, I. [1] ; Gil-Molina, A. [2, 1] ; Pita, J. L. [2] ; Gabrielli, L. H. [2] ; Fragnito, H. L. [1, 3] ; Dainese, P. [1]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: OPTICA; v. 4, n. 10, p. 1219-1227, OCT 20 2017.
Web of Science Citations: 7
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. (C) 2017 Optical Society of America (AU)

FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antônio Hélio de Castro Neto
Support type: Research Projects - SPEC Program
FAPESP's process: 15/11779-4 - Plasmonic and nonlinear effects in graphene coupled to optical waveguides
Grantee:Christiano José Santiago de Matos
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/20180-3 - Light scattering processes in photonic microstructures
Grantee:Paulo Clóvis Dainese Júnior
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 15/04113-0 - Nonlinearities in silicon-based waveguides
Grantee:Ivan Aritz Aldaya Garde
Support type: Scholarships in Brazil - Post-Doctorate