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

doi:10.1364/OE.27.030262

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article

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
Pages (from-to)	30262-30271
Number of pages	10
Journal	Optics Express
Volume	27
Issue number	21
DOIs	https://doi.org/10.1364/OE.27.030262
Publication status	Published - 2019 Oct 14

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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Yonezu, Y., Kou, R., Nishi, H., Tsuchizawa, T., Yamada, K., Aoki, T., Ishizawa, A., & Matsuda, N. (2019). Evaluation of graphene optical nonlinearity with photon-pair generation in graphene-on-silicon waveguides. Optics Express, 27(21), 30262-30271. https://doi.org/10.1364/OE.27.030262

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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.",

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AU - Yonezu, Yuya

AU - Kou, Rai

AU - Nishi, Hidetaka

AU - Tsuchizawa, Tai

AU - Yamada, Koji

AU - Aoki, Takao

AU - Ishizawa, Atsushi

AU - Matsuda, Nobuyuki

PY - 2019/10/14

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