https://doi.org/10.1051/epjconf/202226609005
Characterization of output circular polarization degree in lowcost asymmetric metasurfaces
1 Sapienza Università di Roma, SBAI Department, Via Antonio Scarpa 14-16, Rome, Italy
2 Ibn Tofail University, 6CW7+CVP, Av. de L'Université, Kénitra, Morocco
3 Abdelmalek Essaâdi University, P4P4+HWM, Tanger, Morocco
4 University of Padova, Physics and Astronomy Department, via Marzolo 8, I-35131 Padova, Italy
* Corresponding author: emilija.petronijevic@uniroma1.it
Published online: 13 October 2022
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.
© The Authors, published by EDP Sciences
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
