SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 40: Photonics II

Q 40.3: Vortrag

Mittwoch, 8. März 2023, 15:00–15:15, F442

Nonlocal optical response of finite hyperbolic metamaterials — •Olga Kochanowska^1,2 and Christin David¹ — ¹Institute of Condensed Matter Theory and Optics, Abbe Center of Photonics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany — ²Faculty of Physics, University of Warsaw, Pasteura Street 5, 02-093 Warsaw, Poland

Metamaterials are artificial nano-engineered structures with properties beyond those encountered in nature. Especially interesting are hyperbolic metamaterials (HMMs), i.e. highly anisotropic media characterized by a hyperbolic dispersion relation. HMMs exhibit unusual properties, such as negative refraction of light, with applications in sub-diffraction imaging, refractometric sensing and photovoltaics. In our studies, a type II HMM (consisting of alternating metal and dielectric layers) was analyzed, using Finite-Difference Time-Domain (FDTD) and Fourier Modal Method (FMM) for numerical calculations. Initially, we assumed the local-response approximation (LRA), in which nonlocal effects are neglected. However, as in an HMM metal layers are of subwavelength thickness, the quantum nature of free electrons and their interactions in metals play a significant role and spatial dispersion effects are considered. Therefore, we implement the semi-classical hydrodynamic model into the FMM to account for nonlocal effects in hyperbolic gratings. Consequently, we compare the optical response of type II HMM in different geometries in the LRA and nonlocal case. We determine optimal parameters of the hyperbolic nanostructure at which nonlocal effects are relevant.