Mr. Sean Ramsay Profile

Sean Ramsay

at Univ of Alabama in Huntsville

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Proceedings Article | 3 October 2022 Presentation + Paper

Control of in-plane light scattering using surface lattice resonances

Seyed Sadeghi, Dustin Roberts, Sean Ramsay

Proceedings Volume 12202, 1220208 (2022) https://doi.org/10.1117/12.2632451

KEYWORDS: Scattering, Nanoantennas, Light scattering, Polarization, Solids, Plasmonics, Plasmons, Gold, Surface plasmons, Polarizers

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Under certain conditions periodic arrays of metallic nanoantennas can support hybridization of localized surface plasmon resonances (LSPRs) with the lattice (photonic) modes, forming surface lattice resonances (SLRs). We study in-plane farfield scattering associated SLRs in cases wherein the nanoantennas support distinctively different forms of LSPRs. For this, two different categories of Au nanoantennas are considered. In one category the nanoantennas have 130 nm width and 220 nm length (array 1) while in the other category (array 2) the widths and lengths of the nanoantennas are 240 and 1300 nm, respectively. Therefore, nanoantennas in array 2 have high degree of flatness, as their lateral dimensions are much larger their heights (40 nm). We demonstrate the impact of the multipolar nature of plasmonic edge modes in such flat nanoantennas on the formation SLRs and the spectral features of their in-plane field scattering. Our results also show array 1 with more localized plasmons, can offer more efficient in-plane scattering at narrower spectral widths. Field scattering switching between SLRs and plasmonic edge modes is studied via control of the incident light polarization.

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