Microscopic Response Mechanism of Epsilon-Negative and Epsilon-Near-Zero Metacomposites.

ABSTRACT: Metals have traditionally served as the primary functional phase in the development of metamaterials exhibiting epsilon-near-zero (ENZ) and epsilon-negative (EN) responses, albeit with persisting ambiguities regarding their response mechanisms. This paper presents the tunable ENZ (ε' ~ 0) and EN (ε' < 0) parameters at the 20-MHz to 1-GHz region based on Cu/CaCu₃Ti₄O₁₂ (Cu/CCTO) metacomposites. By means of first-principles calculations and multi-physics simulations, the underlying mechanisms governing ENZ and EN responses are unveiled. The intricate pathways through which metacomposites achieve 2 dielectric response mechanisms are delineated: At low Cu content, a weak EN response (|ε'| < 200) was excited by electric dipole resonance, acc

SUBMITTER: Zhou Y 

PROVIDER: S-EPMC11694408 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature