https://doi.org/10.1140/epjp/s13360-023-04638-2
Regular Article
Linear arrays of metal-coated microspheres: a polarization-sensitive hybrid colloidal plasmonic–photonic crystal
1
National Institute for Research and Development of Isotopic and Molecular Technologies INCDTIM, Cluj-Napoca, Romania
2
Institute for Interdisciplinary Research in Bio-Nano-Sciences, Babes-Bolyai University, Cluj-Napoca, Romania
Received:
10
April
2023
Accepted:
28
October
2023
Published online:
10
November
2023
Colloidal plasmonic–photonic crystals represent a class of hybrid materials consisting of two superposed components: a photonic lattice made of dielectric colloidal spheres and a plasmonic metal film. In this work, the optical properties of a linear array colloidal plasmonic–photonic crystal consisting of silver films deposited over linear arrays (grating-like parallel chains) of polystyrene microspheres are analysed in detail. Experimental and simulated optical transmittance and reflectance spectra both in unpolarized and polarized light are used to investigate the optical response of the linear plasmonic–photonic crystal. Among the various photonic/plasmonic modes observed, the existence of both propagative plasmonic–photonic hybrid mode and localized surface plasmon mode can be mentioned. The spectral tunability of these structures is highlighted by studying the dependence of the optical response on geometrical parameters such as sphere diameter and grating period. Finally, the linear plasmonic–photonic crystal exhibits a polarization-selective surface-enhanced Raman scattering effect, making them of interest for both fundamental studies and development of applications based on surface-enhanced Raman spectroscopy or surface-enhanced fluorescence.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
