Coupling between light and 2D polaritons: Fundamental limits and how to overcome them

Eduardo Brioso Dias; Javier García de Abajo

doi:10.1117/12.2568655

22 August 2020 Coupling between light and 2D polaritons: Fundamental limits and how to overcome them

Eduardo Brioso Dias, Javier García de Abajo

Proceedings Volume 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII; 114621E (2020) https://doi.org/10.1117/12.2568655
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

We address some fundamental limits in the coupling of radiation to 2D polaritons using free-propagating plane-waves. We study the scattering properties of 0D and 1D scatterers over a 2D or finite-thickness layer and quantify the coupling of light-to-polaritons cross-section for this process as a function of the scatterer effective polarizability. We formulate our results for both 0D and 1D scatterers, including material edges, and present them in simple closed-form expressions. We finally propose coupling light to plasmons using a graphene edge as a configuration which maximizes the coupling efficiency. Furthermore, we show that the adequate shaping of the impinging radiation can be used as a strategy to overcome the limitations of using plane-waves, and we demonstrate how to optimize this shaping for several different purposes.

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Eduardo Brioso Dias and Javier García de Abajo "Coupling between light and 2D polaritons: Fundamental limits and how to overcome them", Proc. SPIE 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII, 114621E (22 August 2020); https://doi.org/10.1117/12.2568655

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KEYWORDS

Polaritons

Graphene

Absorption

Plasmonics

Polarizability

Light scattering

Light wave propagation

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