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Pré-Publication, Document De Travail Année : 2023

Second-Order Nonlinearity of Graphene Quantum Dots Measured by Hyper-Rayleigh Scattering

Manoel Leonardo Neto
  • Fonction : Auteur
Renato Silva
  • Fonction : Auteur
Georges Boudebs
Cid de Araújo
  • Fonction : Auteur

Résumé

The first hyperpolarizability of graphene quantum dots (GQDs) suspended in water was determined using the hyper-Rayleigh scattering (HRS) technique. To the best of our knowledge, this is the first application of the HRS technique to characterize GQDs. Two commercial GQDs (Acqua-Cyan and Acqua-Green) with different compositions were studied. The HRS experiments were performed with an excitation laser at 1064 nm. The measured hyperpolarizabilities were (1.0±0.1) × 10^(-27) esu and (0.9±0.1) × 10^(-27) esu for Acqua-Cyan and Acqua-Green, respectively. The results were used to estimate the hyperpolarizability per nanosheet obtained by assuming that each GQDs has five nanosheets with 0.3 nm thickness. The two-level model, used to calculate the static hyperpolarizability per nanosheet, provides the values of (2.4±0.1) × 10^(-28) esu (Acqua-Cyan) and (0.5±0.1) × 10^(-28) esu (Aqua-Green). The origin of the nonlinearity is discussed on the basis of polarized resolved HRS experiments, and an electric quadrupolar behavior with a strong dependence on surface effects is found. The nontoxic characteristics and order of magnitude indicate that these GQDs may be useful for biological microscopy imaging.
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Dates et versions

hal-04257445 , version 1 (25-10-2023)

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Manoel Leonardo Neto, Renato Silva, Georges Boudebs, Cid de Araújo. Second-Order Nonlinearity of Graphene Quantum Dots Measured by Hyper-Rayleigh Scattering. 2023. ⟨hal-04257445⟩

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