Abstract
We evaluate the nonlinear coefficient of graphene-on-silicon waveguides through the coincidence measurement of photon-pairs generated via spontaneous four-wave mixing. We observed the temporal correlation of the photon-pairs from the waveguides over various transfer layouts of graphene sheets. A simple analysis of the experimental results using coupled-wave equations revealed that the atomically-thin graphene sheets enhanced the nonlinearity of silicon waveguides up to ten-fold. The results indicate that the purely χ(3)-based effective nonlinear refractive index of graphene is on the order of 10−13 m2/W, and provide important insights for applications of graphene-based nonlinear optics in on-chip nanophotonics.
Original language | English |
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Pages (from-to) | 30262-30271 |
Number of pages | 10 |
Journal | Optics Express |
Volume | 27 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2019 Oct 14 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics