Bibliographic Details
| 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] |
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| Database: |
Engineering Source |
