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Nonlinear‐optical refraction is typically described by means of perturbation theory near the material's equilibrium state. Graphene, however, can easily move far away from its equilibrium state upon optical pumping, yielding strong nonlinear responses that cannot be modeled as mere perturbations. So far, one is still lacking the required theoretical expressions to make predictions for these complex...
Graphene is known to have a strong nonlinear‐optical refractive response, both in free‐space setups and in waveguide configurations. This image illustrates nonlinearity‐induced spectral broadening of laser pulses propagating in a graphene‐covered waveguide. The propagating field E interacting with the graphene excites free carriers Nc which in turn yield a nonlinear refractive index change ΔnNL. The...
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