an ultra-thin near-perfect absorber via block copolymer engineered metasurfaces
| Description | |
| Date | 2022 |
| Date | |
| Auteurs | Cummins,- C | Flamant,- Q | Dwivedi,- R | Alvarez-Fernandez,- A | Demazy,- N | Bentaleb,- A | Pound-Lana,- G | Zelsmann,- M | Barois,- P | Hadziioannou,- G | Baron,- A | Fleury,- G | Ponsinet,- V | |
| Source | J. Colloid Interface Sci. |
| Résumé | Producing ultrathin light absorber layers is attractive towards the integration of lightweight planar components in electronic, photonic, and sensor devices. In this work, we report the experimental demonstration of a thin gold (Au) metallic metasurface with near-perfect visible absorption (?95 %). Au nanoresonators possessing heights from 5 ? 15 nm with sub-50 nm diameters were engineered by block copolymer (BCP) templating. The Au nanoresonators were fabricated on an alumina (Al2O3) spacer layer and a reflecting Au mirror, in a film-coupled nanoparticle design. The BCP nanopatterning strategy to produce desired heights of Au nanoresonators was tailored to achieve near-perfect absorption at ? 600 nm. The experimental insight described in this work is a step forward towards realizing large area flat optics applications derived from subwavelength-thin metasurfaces. © 2021 Elsevier Inc. |
| DOI | 10.1016/j.jcis.2021.11.163 |
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