Electrically tunable Kerr combs in graphene-nitride microresonators on-chip

Dynamic tuning of soliton Kerr combs is achieved in a graphene actuated silicon nitride microresonator on-chip. Driven by single volt voltage gating, optical dispersion of the microcavity is controlled from −60 to +9 fs2/mm, enabling broadband tuning of the comb spectrum and diversity of soliton crystal generations.