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Nonlinear‐Optical Refraction: Predicting Graphene's Nonlinear‐Optical Refractive Response for Propagating Pulses (Laser Photonics Rev. 14(6)/2020)

Graphene is known to have a strong nonlinear-optical refractive response, both in free-space setups and in waveguide configurations. This image illustrates nonlinearityinduced spectral broadening of laser pulses propagating in a graphene-covered waveguide. The propagating field E interacting with the graphene excites free carriers N c which in turn yield a nonlinear refractive index change ∆n NL . The work described by Nathalie Vermeulen and co-workers in article number 1900402 allows for this nonlinear response to be predicted.