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Journal Articles Scientific Reports Year : 2023

Design of infrared optical absorber using silver nanorings array made by a top-down process

Gérard Berginc
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  • PersonId : 883988

Abstract

This paper presents the numerical simulation and fabrication of a metasurface composed of silver nanorings with a split-ring gap. These nanostructures can exhibit optically-induced magnetic responses with unique possibilities to control absorption at optical frequencies. The absorption coefficient of the silver nanoring was optimized by performing a parametric study with Finite Difference Time Domain (FDTD) simulations. The absorption and scattering cross sections of the nanostructures are numerically calculated to assess the impact of the inner and outer radii, the thickness and the split-ring gap of one nanoring, as well as the periodicity factor for a group of four nanorings. This showed full control on resonance peaks and absorption enhancement in the near infrared spectral range. The experimental fabrication of this metasurface made of an array of silver nanorings is achieved by e-beam lithography and metallization. Optical characterizations are then carried out and compared to the numerical simulations. In contrast to usual microwave split-ring resonator metasurfaces reported in literature, the present study shows both the realization by a topdown process and modelling performed in the infrared frequency range.
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Origin : Publication funded by an institution
licence : CC BY - Attribution

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hal-04096788 , version 1 (13-05-2023)

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Ibtissem Bouanane, F. Bedu, Igor Ozerov, Beniamino Sciacca, Lionel Santinacci, et al.. Design of infrared optical absorber using silver nanorings array made by a top-down process. Scientific Reports, 2023, 13, pp.7770. ⟨10.1038/s41598-023-34579-w⟩. ⟨hal-04096788⟩
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