Magnetically tunable terahertz all-dielectric metamaterial based on liquid crystal

TL;DR

This paper presents a novel magnetically tunable terahertz all-dielectric metamaterial using liquid crystal, demonstrating effective resonance tuning via external magnetic fields, with potential applications in THz devices.

Contribution

It introduces a new fabrication method for high-quality microsphere-based all-dielectric metamaterials and demonstrates magnetic field tuning of their resonances in the terahertz range.

Findings

Resonance tuning is highly sensitive to magnetic field direction.

Effective tuning of the first electric resonance achieved.

Provides a new pathway for tunable THz metamaterials.

Abstract

All-dielectric metamaterials composed of high index and low loss dielectric resonators have become a promising way for high-efficient optical devices. However, fabricating terahertz all-dielectric metamaterials and actively tuning their properties still remain challenges. In this paper, an effective method has been developed to prepare high-quality microspheres based all-dielectric metamaterial operating in terahertz (THz) range. Then, we propose a magnetically tunable THz all-dielectric metamaterial based on liquid crystal (LC). The all-dielectric metamaterial is immersed into LC and tuned by external magnetic field. We show that the induced Mie resonances can be effectively tuned by external magnetic field and the tunability is highly sensitive to the directors of applied magnetic field. A good tunability performance is obtained for the first electric resonance. This work provides a new method for high-quality THz all-dielectric metamaterials and paves a promising way for tunable THz all-dielectric metamaterial, which would find considerable applications in THz devices.