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Characterization of output circular polarization degree in lowcost asymmetric metasurfaces

Authors :
Emilija Petronijevic
Alessandro Belardini
Zakaria El-ansary
Bilal Brioual
Hari Prasath Ram Kumar
Tiziana Cesca
Carlo Scian
Giovanni Mattei
Concita Sibilia
Source :
EPJ Web of Conferences. 266:09005
Publication Year :
2022
Publisher :
EDP Sciences, 2022.

Abstract

Addition of asymmetry in plasmonic nanostructures can lead to chiro-optical phenomena, usually monitored as different absorption of left and right polarization, i.e. circular dichroism. Moreover, interesting features arise when the nanostructure changes the polarization state of the input beam. In this work, we perform extrinsic chirality characterization in a widely tuneable near-infrared range, by monitoring both polarization of the input and of the transmitted beam. We characterize low-cost metasurfaces based on polystyrene nanospheres asymmetrically covered by Ag, by exciting them at different angle of incidence with left, right and linear polarization. We then resolve the circular polarization degree of the transmitted beam, demonstrating resonance-governed circular polarization degree in the output, showing the interplay of both intrinsic and extrinsic chirality.

Details

ISSN :
2100014X
Volume :
266
Database :
OpenAIRE
Journal :
EPJ Web of Conferences
Accession number :
edsair.doi...........d7bc0826e3f66d439e1bbbb604c1a8a8