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

• properties are completely different than those of the constituting materials and are not simply an average of them [1]. A type of metamaterials that we are particularly interested in are hyperbolic metamaterials (HMMs), whose dispersion relation generates an hyperboloid in the k-space. There are some readily

A super-oscillatory step-zoom metalens for visible light

• Yi Zhou,
• Chao Yan,
• Peng Tian,
• Zhu Li,
• Yu He,
• Bin Fan,
• Zhiyong Wang,
• Yao Deng and
• Dongliang Tang

Beilstein J. Nanotechnol. 2022, 13, 1220–1227, doi:10.3762/bjnano.13.101

• plasmons can reach a spatial resolution of 22 nm, but the imaging range is limited to the sample surface, causing difficulties in biomedical imaging. Although negative refractive superlenses and hyperbolic metamaterials [6][7] have been experimentally verified for super-resolution imaging, they exhibit