Working Paper Article Version 1 This version is not peer-reviewed

Design of Silicon Waveguides Integrated with 2D Graphene Oxide Films for Kerr Nonlinear Optics

Version 1 : Received: 7 November 2020 / Approved: 9 November 2020 / Online: 9 November 2020 (11:18:34 CET)

How to cite: Zhang, Y.; Wu, J.; Qu, Y.; Jia, L.; Jia, B.; Moss, D. Design of Silicon Waveguides Integrated with 2D Graphene Oxide Films for Kerr Nonlinear Optics. Preprints 2020, 2020110279 Zhang, Y.; Wu, J.; Qu, Y.; Jia, L.; Jia, B.; Moss, D. Design of Silicon Waveguides Integrated with 2D Graphene Oxide Films for Kerr Nonlinear Optics. Preprints 2020, 2020110279

Abstract

The Kerr nonlinear optical performance of silicon nanowire waveguides integrated with 2D layered graphene oxide (GO) films is theoretically studied and optimized based on experimentally measured linear and nonlinear optical parameters of the GO films. The strong mode overlap between the silicon nanowires and highly nonlinear GO films yields a significantly enhanced Kerr nonlinearity for the hybrid waveguides. A detailed analysis for the influence of waveguide geometry and GO film thickness on the propagation loss, nonlinear parameter, and nonlinear figure of merit (FOM) is performed. The results show that the effective nonlinear parameter and nonlinear FOM can be increased by up to ≈52 and ≈79 times relative to bare silicon nanowires, respectively. Self-phase modulation (SPM)-induced spectral broadening of optical pulses is used as a benchmark to evaluate the nonlinear performance, examining the trade-off between enhancing Kerr nonlinearity and minimizing loss. By optimizing the device parameters to balance this, a high spectral broadening factor of 27.6 can be achieved ‒ more than 6 times that achieved in previous experiments. Finally, the influence of pulse chirp, material anisotropy, and the interplay between saturable absorption and SPM is also discussed. These results provide useful guidance for optimizing the Kerr nonlinear optical performance of silicon waveguides integrated with 2D layered GO films.

Subject Areas

2D materials; silicon photonics; graphene oxide; Kerr nonlinearity

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