Ultra-wideband graphene-based absorber in the terahertz regime based on elliptical slots and a complementary sinusoidal-patterned dielectric layer
| Autor: | Ehsan Zareian-Jahromi, Valiollah Mashayekhi, Milad Nourbakhsh, Raheleh Basiri |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Graphene Terahertz radiation business.industry Bandwidth (signal processing) Surface plasmon Dielectric Electromagnetic radiation Atomic and Molecular Physics and Optics Symmetry (physics) law.invention Optics law Electric field Electrical and Electronic Engineering business Engineering (miscellaneous) |
| Zdroj: | Applied Optics. 60:7297 |
| ISSN: | 2155-3165 1559-128X |
| DOI: | 10.1364/ao.431075 |
| Popis: | A graphene-based absorber is presented based on elliptical slots and a complementary sinusoidal-patterned dielectric layer. The proposed absorber structure includes upper dielectric and metal film layers resulting in a Fabry–Perot cavity. The produced cavity enhances the confinement of electromagnetic waves. The presented absorber yields an absolute bandwidth of 4.02 THz (0.51–4.53 THz) considering an 0.88 absorbance level together with normal incidence. The presented structure benefits from an almost insensitive ultra-wideband absorbing performance as θ varies up to 50°and 60° for TE and TM polarizations, respectively. Moreover, the considered symmetry in the design procedure results in an almost insensitive structure with respect to the φ incident angle. Finally, the obtained 160% fractional bandwidth is much greater compared to mentioned previous works in literature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|