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Journal Articles Journal of Colloid and Interface Science Year : 2022

An Ultra-Thin Near-Perfect Absorber via Block Copolymer Engineered Metasurfaces

Quentin Flamant
Ranjeet Dwivedi
Philippe Barois
Alexandre Baron

Abstract

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 nearperfect absorption at ≈ 600 nm. The experimental insight described in this work is a step forward towards realizing large area flat optics applications derived from subwavelengththin metasurfaces.
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Dates and versions

hal-03547419 , version 1 (28-01-2022)

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Cian Cummins, Quentin Flamant, Ranjeet Dwivedi, Alberto Alvarez-Fernandez, Nils Demazy, et al.. An Ultra-Thin Near-Perfect Absorber via Block Copolymer Engineered Metasurfaces. Journal of Colloid and Interface Science, 2022, 609, pp.375-383. ⟨10.1016/j.jcis.2021.11.163⟩. ⟨hal-03547419⟩
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