Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 75: Poster IIIB

HL 75.13: Poster

Thursday, March 19, 2020, 15:00–17:30, P2/3OG

Optical properties of TiN based superlattices: applicability of the effective medium approximation — •Felix-Florian Delatowski, Chris Sturm, Oliver Herrfurth, Florian Jung, and Marius Grundmann — Felix-Bloch-Institut für Festkörperphysik, Universität Leipzig, Linnéstraße 5, 04103Leipzig

Superlattices based on MgO and TiN are promising for the realization of optical hyperbolic metamaterials [1]. In order to show such hyperbolic behavior, it is possible to describe a superlattice by an uniaxial anisotropic effective medium [2]. The effective medium approximation (EMA) allows a simplified description of the optical properties of the entire superlattice.

In this study, we discuss the applicability of the EMA for TiN/MgO superlattices as a function of the number of layer pairs and thickness of each individual layer. The obtained results are compared to experimental TiN/MgO superlattices grown by pulsed laser deposition and investigated by spectroscopic ellipsometry.

[1] G. Naik et al., PNAS 111, 7546 (2014).

[2] S. Rytov, Soviet Physics JETP 2, 466 (1956).