Quadrupole Mie-resonant metamaterial

TL;DR

This paper introduces a novel quadrupole magnetization metamaterial supporting Mie-resonance, with experimental validation and a theoretical model demonstrating unique optical properties like zero reflection at normal incidence.

Contribution

The study presents the first experimental realization of a quadrupole magnetization metamaterial with a comprehensive theoretical model addressing its dispersion and boundary conditions.

Findings

Demonstrated Mie-resonance-excited stop bands below the Bragg band

Validated the theoretical model with a Fabry-Perot resonator case study

Observed zero reflection at normal incidence in the quadrupole metamaterial

Abstract

Dense lattices of photonic crystals can serve as artificial materials, with light propagation in these structures described by effective material parameters that surpass the capabilities of natural materials. In this study, we introduce a metamaterial that supports quadrupole magnetization, a characteristic rarely observed in existing structures. We experimentally demonstrate a magnetic quadrupole metamaterial associated with Mie-resonance-excited stop bands below the Bragg band. Additionally, we develop a theoretical model that addresses both dispersion and boundary conditions within this framework. Using a Fabry-Perot resonator as a case study, we validate our model and reveal that the quadrupole metamaterial can exhibit a markedly different reflection/transmission spectrum, including zero reflection at normal incidence. Our findings underscore the practical potential for both experimental and theoretical investigations of metamaterials that extend beyond the dipole approximation.