A generic model for the study of supercontinuum generation in graphene-covered nanowires

Abstract

We study supercontinuum generation (SC) in graphene-covered nanowires based on a generic model that correctly accounts for the evolution of the photon number under Kerr and two-photon absorption processes, and the influence of graphene is treated within the framework of saturable photoexcited-carrier refraction. We discuss the role of the various effects on the generation of supercontinuum by a thorough analysis of short-pulse propagation in two different kinds of graphene-covered nanowires, one made of silicon nitride and the other made of silicon. Finally, we discuss the effect of stacking graphene layers as a means to enhance SC generation with pulse powers compatible with those in integrated optical devices.

Perspectives on nonlinear optics of graphene: Opportunities and challenges

“…In one of the frameworks (Castelló-Lurbe et al, 2020), the so-called population recipe (Butcher and Cotter, 1990) was adopted to obtain a closed-form expression containing σ FCR , for the nonlinear response, an expression that can be readily embedded in the pulse propagation equations used for waveguiding media. This approach is beneficia for practical device design as it allows predicting graphene's nonlinear refractive behavior in both free-space and guided-mode configuration (Castelló-Lurbe et al, 2020;Linale et al, 2022). At the same time, the population recipe it relies on only holds for excitation pulses of at least 100 fs.…”