Cactus-like Metamaterial Structures for Electromagnetically Induced Transparency at THz frequencies

TL;DR

This paper introduces a novel 3D metallic metamaterial with cactus-like structures that exhibits electromagnetically induced transparency at THz frequencies, enabling advanced wave control and sensing applications.

Contribution

The paper presents a new cactus-like metamaterial design for THz EIT, combining theoretical analysis and experimental validation with multi-photon polymerization and silver plating.

Findings

Experimental results confirm EIT at THz frequencies.

Enhanced refractive index sensing demonstrated.

Potential for slow light and sensing applications.

Abstract

THz metamaterials present unique opportunities for next generation technologies and applications, as they can fill the ``THz gap'' originating from the weak response of natural materials in this regime, providing a variety of novel or advanced electromagnetic wave control components and systems. Here, we propose a novel metamaterial design, made of three-dimensional, metallic, "cactus like" meta-atoms, showing electromagnetically induced transparency (EIT) and enhanced refractive index sensing performance at low THz frequencies. Following a detailed theoretical analysis, the structure is realized experimentally using multi-photon polymerization and electroless silver plating. The experimental characterization results obtained through THz time domain spectroscopy validate the corresponding numerical data, verifying the high potential of the proposed structure in slow light and sensing applications.