Maximal coupling of light into 2D polaritons

Eduardo J. C. Dias; Javier García de Abajo

doi:10.1117/12.2609495

5 March 2022 Maximal coupling of light into 2D polaritons

Eduardo J. C. Dias, Javier García de Abajo

Proceedings Volume PC12003, 2D Photonic Materials and Devices V; PC120030D (2022) https://doi.org/10.1117/12.2609495
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Polaritons in 2D materials are fundamentally interesting for different technological applications, but their coupling to light is generally weak due to their momentum mismatch. In this work, we remarkably show that a small scatterer placed at a suitable distance from a given surface can couple light completely into the surface modes supported by the surface, under illumination by a modulated field. We present rigorous closed-form prescriptions for the modulation of the incident light beam which maximizes this coupling, depending on the characteristics of the scatterer and surface, and use the derived expressions to provide a rigorous theoretical analysis of the extremal light coupling to plasmons in different 2D materials (namely thin metals and graphene). We corroborate the analytical results by performing fully-numerical simulations using realistic setups, which exhibit a very strong enhancement of the absorption into surface plasmons under the prescribed optimal conditions.

Conference Presentation

Citation Download Citation

Eduardo J. C. Dias and Javier García de Abajo "Maximal coupling of light into 2D polaritons", Proc. SPIE PC12003, 2D Photonic Materials and Devices V, PC120030D (5 March 2022); https://doi.org/10.1117/12.2609495

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