Presentation Information

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[22p-13N-3]Enhancement of optical nonlinear effects with graphene-sandwiched SiN waveguides

〇(M1)Takumi Horiike^1,2, Kenichi Hitachi¹, Atsushi Ishizawa³, Rai Kou⁴, Xuejun Xu¹, Takuma Aihara⁵, Tadashi Nishikawa², Guangwei Cong⁴, Noritsugu Yamamoto⁴, Koji Yamada⁴, Haruki Sanada¹, Katsuya Oguri¹ (1.NTT BRL, 2.Tokyo Denki Univ., 3.Nihon Univ, 4.AIST, 5.NTT DTL)

Keywords:

SiN Waveguide,nonlinear optics,optical frequency comb

In the pursuit of advancing on-chip optical frequency combs, the need for spectral broadening with minimal pulse energy is crucial. Historically, Silicon (Si) waveguides were employed, yet they were hindered by bandwidth limitations induced by two-photon absorption. This study introduces a novel structure, embedding graphene within Silicon Nitride (SiN) waveguides, which are not subject to two-photon absorption. By leveraging the substantial nonlinear optical characteristics of graphene, we enhanced the nonlinearity of the SiN waveguides. Experimental results indicated that increasing the length of graphene led to an extension of the spectral bandwidth towards shorter wavelengths.

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