Angle-dependent chiro-optical characterization of self-assembled nanohole arrays in silver over a wide spectrum range

Hari Prasath Ram Kumar; Emilija Petronijevic; Zakaria El-Ansary; Bilal Brioual; Tiziana Cesca; Carlo Scian; Giovanni Mattei; Mohamed El Hasnaoui; Concita Sibilia; Alessandro Belardini

doi:10.1117/12.2670517

6 June 2023 Angle-dependent chiro-optical characterization of self-assembled nanohole arrays in silver over a wide spectrum range

Hari Prasath Ram Kumar, Emilija Petronijevic, Zakaria El-Ansary, Bilal Brioual, Tiziana Cesca, Carlo Scian, Giovanni Mattei, Mohamed El Hasnaoui, Concita Sibilia, Alessandro Belardini

Author Affiliations +

Proceedings Volume 12568, Metamaterials XIV; 125680X (2023) https://doi.org/10.1117/12.2670517
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Conference Poster

Abstract

Metal nanohole arrays are a famous example of plasmonic nanostructured materials, which are crucial plasmonic devices that display resonances and high electromagnetic confinement in the visible and near-infrared range. Therefore, they have been suggested for use in many applications, including communications and biosensing. In this work, we present the asymmetry in nanoholes and examine its impact on the electromagnetic response using numerical models and broadband experimental measurements. We fabricated a 2D hexagonal array of asymmetric nanoholes in Ag using a low-cost production method called nanosphere lithography combined with tilted silver evaporation. Our experimental setup is based on a laser with fine input and output polarization control that is broadly controllable in the near-infrared spectrum. When the nanohole array is activated with linear polarization, we next determine the circular polarization degree of the transmitted light. We explain the asymmetry of the nanohole, which is supported by numerical simulations, as the cause of the imbalance between left and right transmitted light. We propose that such straightforward plasmonic shape could be optimized to create multipurpose flat-optic devices.

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Hari Prasath Ram Kumar, Emilija Petronijevic, Zakaria El-Ansary, Bilal Brioual, Tiziana Cesca, Carlo Scian, Giovanni Mattei, Mohamed El Hasnaoui, Concita Sibilia, and Alessandro Belardini "Angle-dependent chiro-optical characterization of self-assembled nanohole arrays in silver over a wide spectrum range", Proc. SPIE 12568, Metamaterials XIV, 125680X (6 June 2023); https://doi.org/10.1117/12.2670517

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