A terahertz four-band high-sensitivity perfect absorber based on Dirac semimetal.
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| Title: | A terahertz four-band high-sensitivity perfect absorber based on Dirac semimetal. |
|---|---|
| Authors: | Fu, Shaoming1 (AUTHOR), Yang, Xingyu1 (AUTHOR) 2024006856@yangtzeu.edu.cn |
| Source: | Physics Letters A. Aug2026, Vol. 587, pN.PAG-N.PAG. 1p. |
| Subjects: | Resonance, Semimetals, Detectors, Refractive index |
| Abstract: | We propose and numerically verify a high-sensitivity, narrowband terahertz four-band perfect absorber built from a bulk Dirac semimetal (BDS) and a silicon dioxide (SiO₂) spacer. The simple, rotationally symmetric structure produces four near-unity absorption peaks at f ₁ = 5.825 THz, f ₂ = 7.495 THz, f ₃ = 8.365 THz and f ₄ = 9.460 THz, rendering the device polarization-insensitive. Moreover, the third resonance (M 3) demonstrates wide-angle tolerance. By varying key geometric parameters and the Fermi level of the BDS, the resonant peaks are actively tunable while preserving practical fabrication tolerance. Sensor performance was assessed by changing the ambient refractive index in the range of 1.00–1.08. The three bands maintain absorptivity above 90% across the tested range, and the maximum refractive-index sensitivity (normalized per refractive index unit, RIU) reaches 5123 GHz/RIU, corresponding to an actual frequency shift of 0.41 THz within the tested Δ n = 0.08 range. [ABSTRACT FROM AUTHOR] |
| Copyright of Physics Letters A is the property of Elsevier B.V. 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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194047225 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A terahertz four-band high-sensitivity perfect absorber based on Dirac semimetal. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Fu%2C+Shaoming%22">Fu, Shaoming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Xingyu%22">Yang, Xingyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 2024006856@yangtzeu.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Physics+Letters+A%22">Physics Letters A</searchLink>. Aug2026, Vol. 587, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Resonance%22">Resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Semimetals%22">Semimetals</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Refractive+index%22">Refractive index</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We propose and numerically verify a high-sensitivity, narrowband terahertz four-band perfect absorber built from a bulk Dirac semimetal (BDS) and a silicon dioxide (SiO₂) spacer. The simple, rotationally symmetric structure produces four near-unity absorption peaks at f ₁ = 5.825 THz, f ₂ = 7.495 THz, f ₃ = 8.365 THz and f ₄ = 9.460 THz, rendering the device polarization-insensitive. Moreover, the third resonance (M 3) demonstrates wide-angle tolerance. By varying key geometric parameters and the Fermi level of the BDS, the resonant peaks are actively tunable while preserving practical fabrication tolerance. Sensor performance was assessed by changing the ambient refractive index in the range of 1.00–1.08. The three bands maintain absorptivity above 90% across the tested range, and the maximum refractive-index sensitivity (normalized per refractive index unit, RIU) reaches 5123 GHz/RIU, corresponding to an actual frequency shift of 0.41 THz within the tested Δ n = 0.08 range. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Physics Letters A is the property of Elsevier B.V. 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.physleta.2026.131760 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Resonance Type: general – SubjectFull: Semimetals Type: general – SubjectFull: Detectors Type: general – SubjectFull: Refractive index Type: general Titles: – TitleFull: A terahertz four-band high-sensitivity perfect absorber based on Dirac semimetal. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Fu, Shaoming – PersonEntity: Name: NameFull: Yang, Xingyu IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 08 Text: Aug2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 03759601 Numbering: – Type: volume Value: 587 Titles: – TitleFull: Physics Letters A Type: main |
| ResultId | 1 |
