Multilayered hyperbolic Au/TiO₂ nanostructures for enhancing the nonlinear response around the epsilon-near-zero point

• Fernando Arturo Araiza-Sixtos,
• Mauricio Gomez-Robles,
• Rafael Salas-Montiel and
• Raúl Rangel-Rojo

Beilstein J. Nanotechnol. 2026, 17, 251–261, doi:10.3762/bjnano.17.17

• , a value that is comparable to other ENZ materials in literature. Keywords: epsilon-near-zero (ENZ); hyperbolic metamaterials; nonlinear optics (NLO); Introduction In recent years, the invention of new techniques to fabricate nanostructured materials led to the creation of metamaterials. These new