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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.)

Optical free-carrier generation in silicon nano-waveguides at 1550nm

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Gil-Molina, Andres [1, 2] ; Aldaya, Ivan [2, 3] ; Pita, Julian L. [1] ; Gabrielli, Lucas H. [1] ; Fragnito, Hugo L. [2, 4] ; Dainese, Paulo [2]
Total Authors: 6
[1] Univ Estadual Campinas, Sch Elect & Comp Engn, BR-13083852 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Gleb Wataghin Phys Inst, BR-13083859 Campinas, SP - Brazil
[3] State Univ Sao Paulo UNESP, Campus Sao Joao da Boa Vista, BR-13876750 Sao Joao Da Boa Vista, SP - Brazil
[4] Univ Prebiteriana Mackenzie, MackGraphe, BR-01302907 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Applied Physics Letters; v. 112, n. 25 JUN 18 2018.
Web of Science Citations: 2

We report on time-resolved pump and probe characterization of linear and nonlinear optical generation of free carriers in a silicon strip nano-waveguide at the 1550 nm communication band. Analytical expressions were developed to extract the carrier density averaged along the waveguide length from the measured free-carrier absorption for different input pump power levels. This allows us to discriminate the contributions from two-photon absorption (TPA) and single-photon absorption (SPA), obtaining TPA and SPA coefficients of (1.5+/-0.1) cm/GW and (1.9+/-0.1) m(-1), respectively. Our results reveal that the effective TPA within the waveguide is higher than the value reported for bulk silicon. In addition, we find that for the waveguide under test, the carrier generation via SPA plays an important role up to similar to 300 mW, and therefore, it must be taken into account to correctly assess free-carrier effects in silicon photonic devices. Published by AIP Publishing. (AU)

FAPESP's process: 15/04113-0 - Nonlinearities in Silicon-based Waveguides
Grantee:Ivan Aritz Aldaya Garde
Support type: Scholarships in Brazil - Post-Doctorate
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: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antonio Helio de Castro Neto
Support type: Research Projects - SPEC Program