Polarization optical switching based on the molding of coherent light scattering via surface lattice resonances. (June 2022)

• Record Type: Journal Article
• Authors: Sadeghi, Seyed M.; Gutha, Rithvik R.; Ramsay, Sean; Roberts, Dustin; Sharp, Christina
• Is Part Of: Materials today nano. Volume 18(2022)
• Publication Date: 2022-06
• Subjects: Plasmon -- Mulitpolar resonances -- Collective -- Scattering -- Plasmonic lattices; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Nanoscience; Nanotechnology -- Periodicals; Periodicals; Periodical; Electronic journals; Electronic journals; 620.5
• DOI: 10.1016/j.mtnano.2022.100190
• Languages: English
• ISSNs: 2588-8420

Abstract

Abstract: We study the molding of coherent light scattering in the planes of Au metallic nanoantenna arrays (in-plane light scattering) using surface lattice resonances. The nanoantennas are considered to have similar periodicities and footprints (lateral shapes and sizes) but their heights are varied from 20 to 80 nm. We measure the spectra and relative intensities of the scattered light along the edges of the substrates supporting periodic arrays of such nanoantennas. Our results show that in the case of nanoantennas of high degree of flatness (20 nm height), the variation of the incident light polarization can lead to binary partition of scattered light energy between two modes at two different wavelengths, offering a polarization optical switching process in the near infrared range. This happens as the nature of the light scattering process changes from plasmonic to coherent diffraction associated with the formation of "'edge-mode' surface lattice resonances. As the heights of the nanoantennas are increased, the energy transfer process becomes more continuous, offering mixture of the two scattering processes. Graphical abstract: Image 1 Highlight: 'Edge-mode' surface lattice resonances via diffractive coupling of ultrathin metallic nanoantennas Polarization switching for discrete toggling between scattering modes associated with 'edge-mode' surface lattice resonances and plasmon modes Binary partition of scattered light energy between the two scattering modes Efficient coupling of scattering energy into planes of nanoantennas