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Tunable wide band near-perfect absorber for terahertz waves based on a vanadium dioxide metasurface.

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Title: Tunable wide band near-perfect absorber for terahertz waves based on a vanadium dioxide metasurface.
Authors: Afra, Tara1 (AUTHOR), Fuscaldo, Walter2 (AUTHOR), Zografopoulos, Dimitrios C.2,3 (AUTHOR), Natale, Teresa1 (AUTHOR), Dell'Olio, Francesco1 (AUTHOR) francesco.dellolio@poliba.it
Source: Optical & Quantum Electronics. May2025, Vol. 57 Issue 5, p1-20. 20p.
Subjects: Submillimeter waves, Vanadium dioxide, Phase change materials, Metamaterials, Absorption
Abstract: Vanadium dioxide (VO2) is a remarkable phase-change material whose temperature-driven insulator-to-metal transition unlocks powerful tunability in the THz regime. Here, we present a VO2-based metasurface that not only achieves over 90% absorption efficiency across a broad 1.27–2.64 THz range when in its metallic phase, but also transitions into a nearly perfect reflector (0.1–4 THz) in its dielectric phase. This striking dual functionality leverages the unique conductivity variation of VO2 with temperature and is realized through a metasurface on a thin SiO2 spacer backed by a gold layer. Notably, our design maintains insensitivity to both polarizations and incidence angle—crucial characteristics for practical THz applications—while offering a robust, wideband response. Through systematic analysis, we elucidate the physical mechanisms governing the high absorption and reflection, and demonstrate how key geometric parameters influence the device performance. By combining wideband tunability, angular and polarization invariance, and design simplicity, this metasurface holds substantial promise as a versatile component for next-generation THz technologies. [ABSTRACT FROM AUTHOR]
Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Tunable wide band near-perfect absorber for terahertz waves based on a vanadium dioxide metasurface.
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  Data: <searchLink fieldCode="DE" term="%22Submillimeter+waves%22">Submillimeter waves</searchLink><br /><searchLink fieldCode="DE" term="%22Vanadium+dioxide%22">Vanadium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+change+materials%22">Phase change materials</searchLink><br /><searchLink fieldCode="DE" term="%22Metamaterials%22">Metamaterials</searchLink><br /><searchLink fieldCode="DE" term="%22Absorption%22">Absorption</searchLink>
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  Data: Vanadium dioxide (VO2) is a remarkable phase-change material whose temperature-driven insulator-to-metal transition unlocks powerful tunability in the THz regime. Here, we present a VO2-based metasurface that not only achieves over 90% absorption efficiency across a broad 1.27–2.64 THz range when in its metallic phase, but also transitions into a nearly perfect reflector (0.1–4 THz) in its dielectric phase. This striking dual functionality leverages the unique conductivity variation of VO2 with temperature and is realized through a metasurface on a thin SiO2 spacer backed by a gold layer. Notably, our design maintains insensitivity to both polarizations and incidence angle—crucial characteristics for practical THz applications—while offering a robust, wideband response. Through systematic analysis, we elucidate the physical mechanisms governing the high absorption and reflection, and demonstrate how key geometric parameters influence the device performance. By combining wideband tunability, angular and polarization invariance, and design simplicity, this metasurface holds substantial promise as a versatile component for next-generation THz technologies. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11082-025-08186-0
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        Text: English
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      – SubjectFull: Phase change materials
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      – SubjectFull: Absorption
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              M: 05
              Text: May2025
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