Hyperbolic Metamaterial Feasible for Fabrication with Direct Laser Writing Processes

TL;DR

This paper proposes a hyperbolic metamaterial designed for fabrication using STED-DLW, enabling diffraction-unlimited 3D-structure creation with potential for isotropic permeability despite anisotropic geometry.

Contribution

It introduces a novel hyperbolic metamaterial design compatible with STED-DLW, including analysis of its dispersion properties and potential for isotropic permeability.

Findings

Hyperbolic dispersion appears between 15THz and 20THz.

Design of meandering wire structures with three magnetic dipoles.

Potential for three-dimensionally isotropic permeability.

Abstract

Stimulated emission depletion microscopy inspired direct laser writing (STED-DLW) processes can offer diffraction-unlimited fabrication of 3D-structures, not possible with traditional electron-beam or optical lithography. We propose a hyperbolic metamaterial for fabrication with STED-DLW. First, we design meandering wire structures with three different magnetic dipoles which can be excited under different incidences of light. Then, based on effective parameters corresponding to normal incidence and lateral incidence, we find that the hyperbolic dispersion relation for five-layer structure appears between 15THz to 20THz. Finally, we investigate the influence of imaginary parts of the effective parameters on the metamaterial dispersion. The proposed metamaterial structure has also potential for three-dimensionally isotropic permeability despite geometric anisotropy.