Evaluation of graphene optical nonlinearity with photon-pair generation in graphene-on-silicon waveguides

Yuya Yonezu, Rai Kou, Hidetaka Nishi, Tai Tsuchizawa, Koji Yamada, Takao Aoki, Atsushi Ishizawa, Nobuyuki Matsuda

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)30262-30271
Number of pages10
JournalOptics Express
Volume27
Issue number21
DOIs
Publication statusPublished - 2019 Oct 14

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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