Exploiting the Modulation Effects of Epitaxial Vanadium Film in a Quasi-BIC-Based Terahertz Metamaterial DOI Open Access
Chang Lu, Junxiao Liu, Sihong Chen

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(10), P. 2197 - 2197

Published: May 10, 2025

Terahertz (THz) metamaterials based on phase-change materials (PCMs) offer promising approaches to the dynamic modulation of electromagnetic responses. In this study, we design and experimentally demonstrate a tunable THz metamaterial composed symmetric split-ring resonator (SRR) pair, with left halves covered by 35 nm thick epitaxial vanadium dioxide (VO2) film, enabling simultaneous exploitation both permittivity- conductivity-induced mechanisms. During metal–insulator transition (MIT) VO2, cooperative changes in permittivity conductivity lead excitation, redshift, eventual disappearance quasi-bound state continuum (QBIC) resonance. Finite element simulations, using optical parameters VO2 film defined Drude–Smith model, predict evolution transmission spectra well. These results indicate that change originating from mesoscopic carrier confinement is non-negligible factor hybridized also reveal potential for developing reconfigurable dielectric effects film.

Language: Английский

Exploiting the Modulation Effects of Epitaxial Vanadium Film in a Quasi-BIC-Based Terahertz Metamaterial DOI Open Access
Chang Lu, Junxiao Liu, Sihong Chen

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(10), P. 2197 - 2197

Published: May 10, 2025

Terahertz (THz) metamaterials based on phase-change materials (PCMs) offer promising approaches to the dynamic modulation of electromagnetic responses. In this study, we design and experimentally demonstrate a tunable THz metamaterial composed symmetric split-ring resonator (SRR) pair, with left halves covered by 35 nm thick epitaxial vanadium dioxide (VO2) film, enabling simultaneous exploitation both permittivity- conductivity-induced mechanisms. During metal–insulator transition (MIT) VO2, cooperative changes in permittivity conductivity lead excitation, redshift, eventual disappearance quasi-bound state continuum (QBIC) resonance. Finite element simulations, using optical parameters VO2 film defined Drude–Smith model, predict evolution transmission spectra well. These results indicate that change originating from mesoscopic carrier confinement is non-negligible factor hybridized also reveal potential for developing reconfigurable dielectric effects film.

Language: Английский

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