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