@article{e6c9a0d9284a4488a8a91d64ef564258,
title = "Evaluation of graphene optical nonlinearity with photon-pair generation in graphene-on-silicon waveguides",
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.",
author = "Yuya Yonezu and Rai Kou and Hidetaka Nishi and Tai Tsuchizawa and Koji Yamada and Takao Aoki and Atsushi Ishizawa and Nobuyuki Matsuda",
note = "Funding Information: Japan Society for the Promotion of Science (JP17H02803, JP19H02156, JP19K15054, JP26706021); Ministry of Education, Culture, Sports, Science and Technology (A12621600). This work was supported by JSPS KAKENHI Grant Numbers 17H02803, 19H02156, 19K15054, and 26706021. R. K. acknowledges MEXT Leading Initiative for Excellent Young Researchers (LEADERs) program. Y.Y. acknowledges the Leading Graduate Program in Science and Engineering, Waseda University A12621600 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. Funding Information: Japan Society for the Promotion of Science (JP17H02803, JP19H02156, JP19K15054, JP26706021); Ministry of Education, Culture, Sports, Science and Technology (A12621600). Funding Information: This work was supported by JSPS KAKENHI Grant Numbers 17H02803, 19H02156, 19K15054, and 26706021. R. K. acknowledges MEXT Leading Initiative for Excellent Young Researchers (LEADERs) program. Y.Y. acknowledges the Leading Graduate Program in Science and Engineering, Waseda University A12621600 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. Publisher Copyright: {\textcopyright} 2019 Optical Society of America.",
year = "2019",
month = oct,
day = "14",
doi = "10.1364/OE.27.030262",
language = "English",
volume = "27",
pages = "30262--30271",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "21",
}