Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Nonlocal Soft Plasmonics in Planar Homogeneous Multilayers

Version 1 : Received: 3 August 2023 / Approved: 4 August 2023 / Online: 4 August 2023 (11:14:28 CEST)

A peer-reviewed article of this Preprint also exists.

Ramesh Narayan, P.; David, C. Nonlocal Soft Plasmonics in Planar Homogeneous Multilayers. Photonics 2023, 10, 1021. Ramesh Narayan, P.; David, C. Nonlocal Soft Plasmonics in Planar Homogeneous Multilayers. Photonics 2023, 10, 1021.

Abstract

Plasmonics is the study of resonant oscillations of free electrons in metals caused by incident electromagnetic radiation. Surface plasmons can focus and steer light on the subwavelength scale. Apart from metals, plasmonic phenomena can be observed in soft matter systems such as electrolytes where resonant charge oscillations can be induced for ions in solution. Due to their larger mass, they are plasmon-active in a lower frequency regime and on a larger wavelength scale. Spatial confinement allows increasingly strong charge interactions and gives rise to nonlocality or spatial dispersion effects. These effects manifest as additional longitudinal propagation modes and are known to cause plasmonic broadening and resonance shifts in metal nanostructures. We derive and discuss the nonlocal optical response of ionic plasmons using a hydrodynamic, two-fluid model in a planar homogeneous three-layer system with electrolyte-dielectric interfaces. Studying such systems enables us to identify and understand plasmonic phenomena in biological and chemical systems.

Keywords

nanophotonics; spatial dispersion; nonlocality; theory and simulation

Subject

Physical Sciences, Optics and Photonics

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