Fig. 1: Multiphoton resonance effects in graphene. | Nature Photonics

Fig. 1: Multiphoton resonance effects in graphene.

From: Electrically tuned nonlinearity

Fig. 1

The increase of |Ef| can successively switch off one-photon (|Ef| > 1/2ħω0), two-photon (|Ef| > ħω0) and three-photon (|Ef| > 3/2ħω0) interband transitions by Pauli blocking. Note that two-photon interband transitions contribute to χ(3) positively and one- and three-photon interband transitions contribute to χ(3) negatively4. The red arrows indicate the input photons at ω0 frequency and the blue arrows indicate the generated third-harmonic photons at 3ω0 frequency. ħ, reduced Planck constant.

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